航空电子缩列语词典AVIONICS GLOSSARY

帅哥发表于 2009-1-15 21:00:32

航空电子缩列语词典AVIONICS GLOSSARY
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帅哥发表于 2009-1-15 21:04:57

1 A . . . . . . . . . . . . 2 B . . . . . . . . . . . . 13 C . . . . . . . . . . . . 16 D . . . . . . . . . . . . 24 E . . . . . . . . . . . . 31 F . . . . . . . . . . . . 37 G . . . . . . . . . . . .42 H . . . . . . . . . . . .45 I . . . . . . . . . . . .48 J . . . . . . . . . . . .53 K . . . . . . . . . . . .54 L . . . . . . . . . . .54 M . . . . . . . . . . .58 N . . . . . . . . . . . 65 O . . . . . . . . . . . 69 P . . . . . . . . . . . 72 Q . . . . . . . . . . . 80 R . . . . . . . . . . . 80 S . . . . . . . . . . .86 T . . . . . . . . . . .96 U . . . . . . . . . . . 104 V . . . . . . . . . . . 105 W . . . . . . . . . .109 X . . . . . . . . . . .111 Y . . . . . . . . . . . 112 Z . . . . . . . . . . . 112 *Av i o n ics-ese. Sometimes called Av - s p e a k . I t ’s a confusing, sometimes frustrating language. T h a t ’s why your friends at Rockwell Collins created this handy compendium of acronyms, terms and definitions. We hope it helps. Copyright © 2001 Rockwell Collins, Inc. w w w. ro c k w e l l c o l l i n s . c o m C O N T E N T S O F G L O S S A R Y AVIONICS GLOSSARY How to Speak Avionics-ese* 3 A c c l r m Acce lerome ter AC C T S Avia t ion Coordi n a t i ng Com m i t tee for Te lec om mun ic a t ions Services AC E ( 1 ) The con trol ch a racter mea n i ng tech n ical ackn owledge ( 2 ) Act u a tor Con trol Electron ic s ( 3 ) Adva nced Cert i fic a t ion Equi pme n t AC F Area Con trol Fac i l i ty AC I D Ai rc raft Id e n t i fic a t ion AC I P S Ai rfoil and Cowl Ice Pro tect ion Syste m AC K The con trol ch a racter mea n i ng tech n ical ackn owledge ment of an upl i nk, used in an ACA RS syste m AC M P A l tern a t i ng Current Mo tor Pum p AC M S Ai rc raft Con di t ion Mon i tori ng Syste m AC P Au dio Con trol Panel AC S ( 1 ) Act ive Con trol Syste m ( 2 ) Au dio Con trol Syste m AC S G Aeron au t ical Com mun ic a t ions Sub-Gro u p AC T Act ive AC U ( 1 ) A pron Con trol Un i t ( 2 ) An tenna Con trol Un i t ( 3 ) Au to pi lot Con trol Un i t A / D An a log - To - D igi ta l A D Adm i n i stra t ive Dom a i n A DA C om p u ter Progra m m i ng Langu age A DA S Au tom a ted Wea th er Observi ng System Da ta Acqui s i t ion Syste m A D C Air Da ta Com p u ter A D F Au tom a t ic Direct ion Fi n d er A D I Attitude Director In dic a tor 3 - D, 4-D T h ree or four di me n s ion 4096 Code The octal ba se, fo u r- digit code used be tween fra m i ng p ul ses of a re ply to id e n t i fy the airc raft or for ge n era l use and emerge ncy cod es (XPD ) 1 0 B a s e T 10 Mbps ba se band data tra n s m i ss ion over twi sted c o p per wi re A ( 1 ) Au to t un ed NAVAID ( 2 ) Am peres A AC Aeron au t ical Adm i n i stra t ive Com mun ic a t ion s A A D Ass ign ed Altitude Devia t ion A A I Ai rline Avion ics In st i t u te A A L Above Aerod ome Leve l A A M P Adva nced Arch i tect u re Mic ro - P rocessor A AT S Avia t ion and Air Traffic Services A AT T Adva nced Avia t ion Tra n s porta t ion Tech n ology A / B Au to brake A B E A R INC 429 Bus Emula tor A B M Asynch ron o us Ba la nced Mod e A- B P S K ( 1 ) Aeron au t ical Bi n a ry Phase Shift Keyi ng ( 2 ) Avia t ion Bi n a ry Phase Shift Keyi ng A B R V Ab brevia t ion A B S Absol u te AC ( 1 ) Advi sory Circula r ( 2 ) A l tern a t i ng Curre n t A / C Ai rc raft AC A Ad dress Com press ion A lgori thm AC AC Ai r- C ooled Air Cooler AC A S Ai r borne Col l i s ion Avoid a nce Syste m AC A R S Ai rc raft Com mun ic a t ions Ad dress i ng and Re port i ng Syste m AC C ( 1 ) Act ive Clea ra nce Con trol ( 2 ) Area Con trol Center 2 5 A F Ai rway Fac i l i t ies A F C ( 1 ) Au tom a t ic Freque ncy Com pe n sa t ion ( 2 ) Au tom a t ic Freque ncy Con trol A F C A S Au tom a t ic Fl ight Con trol Augme n ta t ion Syste m A F C S Au tom a t ic Fl ight Con trol Syste m A F D ( 1 ) Ad a p t ive Fl ight Display ( 2 ) Adva nced Fl ight Deck ( 3 ) Au to pi lot Fl ight Director A F D C Au to pi lot Fl ight Director Com p u ter A F D S Au to pi lot Fl ight Director Syste m A F E P S ACA RS Front End Process i ng Syste m A F I Au th ori ty Format Id e n t i fier A F I S ( 1 ) Ai r borne Fl ight Inform a t ion Syste m ( 2 ) Au tom a t ic Fl ight Inform a t ion Service A F M Ai rc raft Fl ight Ma nu a l A F N ATS Fac i l i t ies No t i fic a t ion A F S ( 1 ) Aeron au t ical Fi xed Service ( 2 ) Ai r borne Fi le Server ( 3 ) Au tom a t ic Fl ight Syste m A F S S Au tom a t ic Fl ight Service Sta t ion A F S K Au dio Freque ncy Shift Keyi ng A F T N Aeron au t ical Fi xed Te lec om mun ic a t ion s A F T R C C Aeros pace and Fl ight Text Radio Coordi n a t i ng C o unc i l A / G Ai r / G ro un d AG AC S Au tom a t ic Gro un d - Air Com mun ic a t ion Syste m . It is also kn own as ATC SS or DATA LIN K. AG AT E Adva nced Ge n eral Avia t ion Tra n s port Experi me n t AG C Au tom a t ic Gain Con trol . AGC is used to maintain the output level of the rece iver. AG I S Air Gro und In termedia te Syste m A D I R S Air Da ta In ert ial Refere nce Syste m A D I R U Air Da ta In ert ial Refere nce Un i t A D L Aeron au t ical Da ta Link A DLP ( 1 ) Ai r borne Da ta Link Pro toc ol ( 2 ) Ai rc raft Da ta Link Processor A D L S Aeron au t ical Da ta Link Services A D M Air Da ta Module A D M S Ai rline Da ta Ma n age ment Syste m A D P Air Da ta Processor A D R A S Ai rplane Da ta Rec overy and An a lysis Syste m A D S ( 1 ) Air Da ta Syste m ( 2 ) Au tom a t ic De pendent Surve i l la nce A D S-A Au tom a t ic De pendent Surve i l la nce – Ad dress A D S- B Au tom a t ic De pendent Surve i l la nce – Broa d c a st A D S E L Ad dress Se lect ive. A SSR system electron ic a l ly a rra nged to address each tra n s pon d er se lect ive ly. O nly a pa rt icular tra n s pon d er will res pon d, th us avoidi ng ga r bl i ng. A DSE L uses a mon o p ul se tech n ique to provide more accu ra te bea ri ng mea s u re me n t . A DSE L is com pa t i ble wi th DA BS. ( Refer to Mode S tra n s pon d er s.) A D S P Au tom a t ic De pendent Surve i l la nce Pa n e l A D S U ( 1 ) Au tom a t ic De pendent Surve i l la nce Syste m ( 2 ) Au tom a t ic De pendent Surve i l la nce Un i t A D T N Adm i n i stra t ive Da ta Tra n s m i ss ion Ne twor k A E C U Au dio Electron ic Con trol Un i t A E E C Ai rl i n es Electron ic Engi n eeri ng Com m i t tee A E P ( 1 ) Au dio En terta i nment Player ( 2 ) Au to pi lot Engage Pa n e l A E R A Au tom a ted En Ro u te traffic con trol A E S Ai rc raft Earth Sta t ion A E U Auxi l ia ry Equi pment Un i t 4 7 A I T Adva nced In te l l ige nce Ta pe - used for the storage of digi tal vid eo and au dio fi les A I V Accumula tor Isola t ion Va lve A I X Adva nced In teract ive Execu t ive A J P S AFE PS Jo u rnal Process i ng Syste m A / L Au tola n d A L C Au tom a t ic Level Con trol . A c i rcuit used to maintain the output of a tra n s m i t ter rega rdless of va ria t ions in the atte nu a t ion of the syste m . A L E Au tom a t ic Link Esta bl i s hme n t A L I A l t i me ter A L PA Ai rline Pilo ts Assoc ia t ion A L S A p pl ic a t ion Layer Struct u re A L S I P C lea r A LT ( 1 ) Ai r borne Link Term i n a l ( 2 ) A l tern a te ( 3 ) A l t i me ter ( 4 ) A l t i t u d e A LT HOLD Altitude Hold Mod e A l t i t u d e He ight determ i n ed by ba rome tric press u re Altitude A c on t i nu o us re t u rn ac ross the di s play at a ra nge R i n g equiva lent to airc raft altitude (WXR) A LT S Altitude Se lect A L U Ari thme t ic and Logic Un i t A M Am plitude Modula t ion . A s ignal wh ere the carrier s ignal is va ried in amplitude to enc ode voice or d a ta inform a t ion . A M A S S Ai rport Move ment Area Safe ty Syste m A M C Avion ics Ma i n te n a nce Confere nce A M C P Aeron au t ical Mo bi le Com mun ic a t ions Pa n e l A M E Am plitude Modula t ion Equiva le n t . An AM type sign a l that processes the modula ted inform a t ion signal and c a rrier freque ncy se pa ra te ly and then rec on structs the two signals to make an equiva lent AM sign a l . AG L Above Gro und Leve l AG R Ai r / G ro und Ro u ter AG R M Ai r / G ro und Ro u ter Regional Ma n ager AG R M S Ai r / G ro und Ro u ter Ma n age ment Syste m AG S Ai r / G ro und Syste m AG S S ACA RS Gro und System Sta n d a rd (AEEC ) AGT S Ai r / G ro und Test Sta t ion A H C Attitude Hea di ng Com p u ter A H R S Attitude Hea di ng Refere nce Syste m A I ( 1 ) A l tern a t ive In terroga tor ( 2 ) Art i fic ial In te l l ige nce A I C Aeron au t ical Inform a t ion Circula r A I D A l tered Item Drawi ng. A drawi ng that details wh a t a l tera t ion or ch a nge is made to an alrea dy exi st i ng c om pon e n t .E xa m ples may be shorte n i ng the shaft of a va ria ble res i stor, or addi ng a program to a circui t c a rd to produce a progra m med circuit card. A I D C Air Traffic Services (ATS) In ter- Fac i l i ty Da ta C om mun ic a t ion s A I D S Ai rc raft In tegra ted Da ta Syste m A I E M Ai rl i n es In tern a t ional Electron ics Mee t i ng A I M S Ai rc raft Inform a t ion Ma n age ment Syste m A I N S C Aeron au t ical In dustry Service Com mun ic a t ion s A I P Aeron au t ical Inform a t ion Publ ic a t ion A I R AC Aeron au t ical Inform a t ion Regula t ion and Con trol A I R C O M D igi tal air/gro und com mun ic a t ions services provid ed by SITA . A system similar to ACA RS. AIR DATA T h ose pa ra me ters that can be derived from kn owledge of the air mass surro un di ng the airc raft . A I R M E T Ai rm a n’s Me teorological (Inform a t ion ) A i r w a y s The sta n d a rd ICAO IFR ro u tes A I S Aeron au t ical Inform a t ion Services 6 9 AO D C Age Of Da ta , C lock (GPS term ) AO D E Age Of Da ta , E p h e meris (GPS term ) AO G Ai rc raft On Gro un d AO H E Air/Oil Heat Exch a nger AO M Ai rc raft Opera t i ng Ma nu a l AO P ( 1 ) Aeron au t ical OSI Profi le ( 2 ) Ai rline Opera t ional Procedu re AO PA Ai rc raft Own ers and Pilo ts Assoc ia t ion AO P G Aerodrome Opera t ions Gro u p AO R Atla n t ic Ocean Region AO R- E Atla n t ic Ocean Region - E a st AO R-W Atla n t ic Ocean Region -West A / P Au to pi lo t . A c om p u ter com m a n d ed system for c on trol l i ng airc raft con trol surfaces. A P Ai rport Loc a t ion (ACA RS / AFERS ) A PA ( 1 ) A l l ied Pilo ts Assoc ia t ion ( 2 ) Au to pi lot Am pl i fier A P B Auxi l ia ry Power Breaker A P C ( 1 ) Au to pi lot Com p u ter ( 2 ) Aeron au t ical Publ ic Corres pon d e nce ( 3 ) Aeron au t ical Pa sse nger Com mun ic a t ion A P I A p pl ic a t ion Progra m m i ng In terface A P M S Au tom a ted Perform a nce Mea s u re ment Syste m A P N A R INC Packet Ne twor k A P P ( 1 ) A p proach Con trol ( 2 ) Au to pi lot Pa n e l A P P R A p proach A P R Actual Perform a nce Reserve A P R L ATN Profi le Requi re ment List A P S Au to pi lot Syste m A P U Auxi l ia ry Power Un i t A M I Ai rline Modi fia ble Inform a t ion A M L C D Act ive Ma trix Liquid Crystal Display A M M Ai rc raft Ma i n te n a nce Ma nu a l A M P Au dio Ma n age ment Pa n e l A M S ( 1 ) A pron Ma n age ment Service ( 2 ) Avion ics Ma n age ment Service A M S ( R ) S Aeron au t ical Mo bi le Sa te l l i te (Ro u te) Service A M S S Aeron au t ical Mo bi le Sa te l l i te Service A M TO S S Ai rc raft Ma i n te n a nce Task Orie n ted Support Syste m . An au tom a ted data re trieval syste m . A M T S Aeron au t ical Message Tra n sfer Service A M U Au dio Ma n age ment Un i t A M U X Au dio Mul t i plexer A N C Air Naviga t ion Com m i ss ion (ICAO ) A n e r o i d An evacu a ted and sea led caps ule or be l lows th a t C a p s u l e expa n ds or con tracts in res pon se to ch a nges in press u re. A N I C S A laskan NAS In terfac i l i ty Com mun ic a t ion Syste m A N L P A R INC Ne twork Layer Pro toc ol A N P Actual Naviga t ion Perform a nce A N S ( 1 ) Am bient Noi se Se n sor ( 2 ) Area Naviga t ion Syste m A N S I American Na t ional Sta n d a rds In st i t u te A N T An te n n a A N TC Adva nced Ne twor ki ng Test Center AOA Ang le Of At tack AO C ( 1 ) Aeron au t ical Opera t ional Con trol ( 2 ) Ai rc raft Opera t ional Con trol ( 3 ) Ai rline Opera t ional Con trol ( 4 ) Ai rport Obstruct ion Ch a rt ( 5 ) Ai rport Opera t ional Com mun ic a t ion s AO C C Ai rline Opera t ion Con trol Center AO D Au dio on De m a n d 8 1 1 A S C I I American Sta n d a rd Code for Inform a t ion In terch a nge A S C P C Air Supply and Cabin Press u re Con trol ler s A S D Ai rc raft Situation Display A S D E Ai rport Surface De tect ion Equi pme n t A S D L Aeron au t ical Sa te l l i te Da ta Link A S E A l t i me try System Error A S E C N A Age ncy for the Secu ri ty of Aerial Naviga t ion in Africa and Ma d aga sc a r A S G A R INC Signal Ga teway A S I Avion ics System In tegra t ion A S I C A p pl ic a t ion Spec i fic In tegra ted Circui t A S M ( 1 ) Ai r s pace Ma n age me n t ( 2 ) Au to th ro t tle Servo Mo tor A S N. 1 Abstract Syn tax No ta t ion One A S O S Au tom a ted Surface Observi ng Syste m A S P ( 1 ) Altitude Set Pa n e l ( 2 ) Aeron au t ical Fi xed Service (AFS) Syste m s Pla n n i ng for data interch a nge A S P P Aeron au t ical Fi xed Service (AFS) Systems Pla n n i ng for data interch a nge Pa n e l A-S M G C S Adva nced Surface Move ment Guid a nce and C on trol Syste m s A S R Ai rport Surve i l la nce Radar A S R S Avia t ion Safe ty Re port i ng Syste m A S S TC Aeros pace Simula t ion and Systems Test Center A S T F Ai r s pace System Task Force A S U Avion ics Swi tch i ng Un i t A S S V A l tern a te So u rce Se lect ion Va lve A S TA Ai rport Surface Traffic Au tom a t ion A P U C Auxi l ia ry Power Unit Con trol ler AQ F Avion ics Qualific a t ion Fac i l i ty AQ P ( 1 ) Adva nced Qualific a t ion Progra m ( 2 ) Avion ics Qualific a t ion Procedu re A-Q P S K Aeron au t ical Quadra t u re Phase Shift Keyi ng AQ S Adva nced Quality Syste m A R AC Avia t ion Rule m aki ng Advi sory Com m i t tee A R B Ar bi tra ry Waveform Ge n era tor A R F Ai rline Risk Factor A R I N C Aeron au t ical Radio, INC orpora ted ARINC 429-13 Mark 33 Digi tal Inform a t ion Tra n sfer System (DITS ), S u p ple ment 13 ARINC 629-2 Mul t i - Tester Da ta Bus: Pa rt 1 - Tech n ical Desc ri p t ion A R M C Area Regional Ma i n te n a nce Center A R P ( 1 ) Aeron au t ical Rec om me n d ed Pract ice ( 2 ) Air Da ta Refere nce Pa n e l A R PA Adva nced Resea rch Projects Age nc y A R R Arriva l A R S Au tom a ted Radar Sum m a ry ch a rt .T h ese are hourly ge n era ted ch a rts showi ng loc a t ion and inte n s i ty of radar ech oes. A R S R Air Ro u te Surve i l la nce Radar A R T Au tom a t ic Reserve T h rust A R TC C Ai r- Ro u te Traffic Con trol Center. A p proxi m a te ly 20 ce n ters cover the air traffic ro u tes in the Un i ted Sta tes us i ng numero us radars and ra dio com mun ic a t ion se ts. A R T S Au tom a ted Terminal Radar Syste m A S A ( 1 ) Ai rc raft Se pa ra t ion Ass u ra nce ( 2 ) Au toland Sta t us An nunc ia tor (AF DS ) A S A A ACA RS System Access A p proval (AEEC ) A S A S Ai rc raft Se pa ra t ion Ass u ra nce System (AEEC ) 1 0 1 3 AT S G F Air Traffic Services Geogra p h ic Fi l ter AT S M Air Traffic Services Message Processor AT S U Air Traffic Services Un i t AT T At t i t u d e AU X Auxi l ia ry AV I O N I C S Avia t ion Electron ic s AV L A N Avion ics Local Area Ne twor k AV L C Avia t ion VHF Link Con trol AV M Ai r borne Vi bra t ion Mon i tor AVO L Aerodrome Vi s i bi l i ty Opera t ional Leve l AV PAC Avia t ion Packet Com mun ic a t ion AWAC S Ai r borne Wa rn i ng And Con trol Syste m AWA S Au tom a ted Wea th er Advi sory Sta t ion AW G American Wi re Gauge AW I N Avia t ion Wea th er Inform a t ion AW I P S Adva nced Wea th er In teract ive Process i ng Syste m AW M Au dio Wa rn i ng Mixer AW O All Wea th er Opera t ion s AW O P All Wea th er Opera t ions Pa n e l AW O S Au tom a ted Wea th er Observa t ion Syste m . A syste m that ga th ers surface wea th er inform a t ion and tra n s m i ts the inform a t ion to the pi lot via VOR, C omm Freq or te le p h one lines. B a n d w i d t h The di ffere nce be tween the hig h est and lowest freque ncy com pon e n ts of a sign a l . B A P Ba nk Ang le Pro tect ion B A R O Ba rome tric B a r o-C o r r e c t e d P ress u re altitude-corrected local ba rome tric press u re. A l t i t u d e B ATA P Type B A p pl ic a t ion to A p pl ic a t ion Pro toc ol AT ( 1 ) Air Traffic ( 2 ) Air Tra n s port A / T Au to th ro t tle ATA ( 1 ) Actual Ti me of Arriva l ( 2 ) Air Tra n s port Assoc ia t ion ATC Air Traffic Con trol ATC A Air Traffic Con trol Assoc ia t ion ATC C Air Traffic Con trol Center ATCR B S Air Traffic Con trol Radar Beac on Syste m ATC S S Air Traffic Con trol Sign a l i ng Syste m . A system to provide inform a t ion be tween the pi lot and air traffic c on trol us i ng the VHF com mun ic a t ions tra n sce iver in con j unct ion wi th data link equi pme n t . AT E Au tom a t ic Test Equi pme n t AT F M Air Traffic Flow Ma n age me n t AT H R Au to th rust Syste m AT H S Au tom a t ic Ta rget Ha n d off Syste m AT I In strument Size Unit of Mea s u re AT I S ( 1 ) Air Traffic Inform a t ion Service ( 2 ) Au tom a t ic Terminal Inform a t ion Service ( 3 ) Au tom a t ic Terminal Inform a t ion Syste m AT L A S Ab brevia ted Test Langu age for Avion ics Syste m s AT M ( 1 ) Air Traffic Ma n age me n t ( 2 ) Asynch ron o us Tra n sfer Mod e AT N Aeron au t ical Te lec om mun ic a t ions Ne twor k AT N P Aeron au t ical Te lec om mun ic a t ion Ne twork Pa n e l AT P Acce p ta nce Test Procedu re (Air Tra n s port ) AT R Air Tra n s port Racki ng AT S ( 1 ) Air Traffic Services ( 2 ) Air Tu r bine Sta rter ( 3 ) Au to th ro t tle Syste m AT S C Air Traffic Service Com mun ic a t ion 1 2 1 5 B i t A bi n a ry digi t . S m a l lest data unit in a mic ro processor syste m . B I T B ui l t - In - Test B I T E B ui l t - In - Test Equi pme n t B L K ( 1 ) Black ( 2 ) Block B M V Brake Me teri ng Va lve B N R Bi n a ry B N S Bo un d a ry No t i fic a t ion System (Squi t ter s ) B O C Bo t tom Of Climb B O M Bill Of Ma teria l B O P Bit Orie n ted Pro toc ol B o r e s i g h t i n g The process of align i ng a di rect ional antenna syste m . B P ( 1 ) BITE P rocessor ( 2 ) Bo t tom Pl ug B P C U B us Power Con trol Un i t b p s bi tes per sec on d B p s Bytes per sec on d B P S K Bi n a ry Phase Shift Keyi ng B R Bridge B R G Bea ri ng B R I Ba s ic Rate In terface B R N AV Ba s ic Area Naviga t ion B R T Brig h tn ess B S C U Brake System Con trol Un i t B S N Backbone Subnetwor k B S P Boa rd Support Pack age B S U ( 1 ) Beam Steeri ng Un i t ( 2 ) Bypa ss Swi tch Un i t B T B B us Tie Breaker B B Ba se Ba n d B C D Bi n a ry Cod ed Dec i m a l .A c odi ng system in wh ich each digit from 0 to 9 is re prese n ted by a four bit bi n a ry num ber. B CRS Back Course B C S Block Check Seque nce. BCS is a cyc l ic code that is used as refere nce bi ts in an error detect ion process. B D I Bea ri ng Dista nce In dic a tor B D M I S B us i n ess Da ta Ma n age ment and Invoic i ng Beam Wi d t h The beam width is the width of the beam as mea s u red at the half-power poi n ts of the ra dia ted s ignal ( W X R ). B e a r i n g The di rect ion of a point or naviga t ional aid mea s u red c lockwi se from a refere nce th ro ugh 360 ° . B E P Back - End Processor B E P M S Back - End Processor Ma n age ment Syste m B E R Bi te Error Rate B F E B uyer Fu rn i s h ed Equi pme n t B F O Beat Freque ncy Osc i l la tor. An osc i l la tor that produces a signal to be mixed wi th the rece ived freque ncy to produce an au di ble beat note, for the purpose of d ec odi ng the Mor se code id e n t i fier of an NDB. T h e osc i l la tor produces freque nc ies equal to the sum and di ffere nce of the com bi n ed freque nc ies. B G I B us Grant Inh i bi t . A term used in CA PS tra n sfer b us process i ng. B G P Bord er Ga teway Pro toc ol B I B u rn - In B i G S Bi l i ngual Gro und Sta t ion (ACA RS and V DML 2 ) B i n a r y Ba se-2 coun t i ng syste m . N um bers include 0, 1. B I S Bo un d a ry In termedia te Syste m B I S M S BIS Ma n age ment Syste m B I S T B ui l t - In Self Test 1 4 1 7 C A S E C om p u ter Aid ed Softwa re Engi n eeri ng C AT ( 1 ) C a tegories (I, I I, III) for Vi s i bi l i ty Requi re me n ts ( 2 ) C lear Air Tu r b ule nce ( 3 ) C om p u ter Aid ed Test i ng CAT I O pera t ional perform a nce Category I. An ILS fac i l i ty providi ng opera t ion down to a 60 - me ter (200 fee t ) d ec i s ion height and wi th runway visual ra nge not less than 800 me ters (2600 feet) and a high pro ba bi l i ty of a p proach success. CAT I An ILS A p proach to lower- th a n - sta n d a rd Category I E n h a n c e d and in some cases to Category II, m i n i mum s, ba sed on guid a nce - to - to uch d own provid ed by a Category I I I - c a pa ble Head-up Guid a nce Syste m , per FA A O rd er 8400.13. CAT II O pera t ional perform a nce Category II. An ILS fac i l i ty providi ng opera t ion down to a 30 - me ter (100 fee t ) d ec i s ion height and wi th runway visual ra nge not less than 400 me ters (1200 feet) and a high pro ba bi l i ty of a p proach success. CAT III a O pera t ional perform a nce Category III a. An ILS fac i l i ty providi ng opera t ion wi th no dec i s ion height limit to and along the surface of the runway wi th extern a l visual refere nce du ri ng final phase of la n di ng and wi th a runway visual ra nge of not less than 200 me ter s ( 700 fee t ). CAT III b O pera t ional perform a nce Category III b. An ILS fac i l i ty providi ng opera t ion wi th no dec i s ion heig h t limit to and along the surface of the runway wi th o u t re l ia nce on external visual refere nce; and subseque n tly ta xi i ng wi th external visual ra nge of not less than 50 me ters (150 fee t ). CAT III c O pera t ional perform a nce Category III c. An ILS fac i l i ty providi ng opera t ion wi th no dec i s ion heig h t limit to and along the surface of the runway and ta xi ways wi thout re l ia nce on external visual refere nce. C AT EVS C lear Air Tu r b ule nce Enh a nced Vi s ion Syste m C- B A N D The freque ncy ra nge be tween 4,000 and 8,000 MHz. C B T C om p u ter- Ba sed Tra i n i ng C C C - C h eck B T M U Brake Te m pera t u re Mon i tor Un i t B WA N Backup WA N B y t e A gro u pi ng of eight bi ts. C & C C ommand and Con trol C & W C on trol and Wa rn i ng CA A C ivil Avia t ion Au th ori ty. A regula tory age ncy in th e Un i ted Ki ngd om . C A AC C ivil Avia t ion Adm i n i stra t ion of China CAC C au t ion Advi sory Com p u ter C /A Code ( 1 ) C o u r se Acqui s i t ion Cod e ( 2 ) G PS Course Acqui s i t ion Cod e C AC P C a bin Area Con trol Pa n e l CA D C om p u ter Aid ed Des ign C A DAG C om mun ic a t ions Au tom a t ion and Da ta Link CA E C om ponent A p pl ic a t ion Engi n eer CAG E C om merc ial Avion ics GPS Engi n e C A H C a bin At tendant Ha n dse ts CA I C au t ion An nunc ia tor In dic a tor C a l i b r a t e d C orrected for instrument errors and errors due to A i r s p e e d pos i t ion or loc a t ion of the press u re so u rce. At sta n d a rd sea level con di t ion s, CAS is equal to true a i r s peed (TA S ). CA L S E L A va ria t ion of the SE LCA L system in wh ich th e SE LCA L s ignal is com bi n ed wi th a spec ial ga t i ng ton e to produce an au tom a t ic funct ion by the rece iver. T h i s system is only a pro posal and not yet imple me n ted. CAL VER C a l i bra t ion Veri fic a t ion CA M C om p u ter Aid ed Ma nu fact u ri ng CA P T C a p ta i n Ca r r i e r An ac signal that can be modula ted by ch a ngi ng th e a m pl i t u d e, freque ncy or pul se of the sign a l . CA S ( 1 ) C ol l i s ion Avoid a nce Syste m ( 2 ) C om p u ted Ai r s peed 1 6 1 9 C E U C h eckl i st En try Un i t C F C h a nge Fie ld CF D I U C e n tral Fault Display In terface Un i t CF D S C e n tra l ized Fault Display Syste m C F I T C on trol led Fl ight In to Terra i n c f m C u bic Feet per Minu te C F M U C e n tral Flow Ma n age ment Un i t C F S C a bin Fi le Server C G C e n ter of Gravi ty CH G ( 1 ) C h a nge ( 2 ) C h a rge C H I C om p u ter Human In terface C H I S C e n ter Hydraul ic Isola t ion Syste m CH O L C ollins High Ord er Langu age CI ( 1 ) C a bin In terp h on e ( 2 ) C onfigu ra t ion Ite m C I D C a tegory In teract ion Diagra m CI D I N C om m on ICAO Da ta In terch a nge Ne twor k CI D S C a bin In terp h one Distri b u t ion Syste m CI E C om m i ss ion In tern a t ion a le de I Ecla i rage C I S C orpora te Inform a t ion Syste m CLB C l i m b CLK C lock C L N P C on n ect ionless Ne twork Pro toc ol C L N S C on n ect ionless Ne twork Service Cl o u d Wa ter or ice pa rt ic les havi ng ra dii smaller th a n D r o p l e t s 0.01 c m CLR C lea r C LT P C on n ect ionless Mode Tra n s port Pro toc ol C C B ( 1 ) C onfigu ra t ion Con trol Boa rd ( 2 ) C onverter Circuit Breaker C C D ( 1 ) C h a rged Coupled Device ( 2 ) C u r sor Con trol Device C C I R In tern a t ional Radio Con s ul ta t ive Com m i t tee C C I T T C on s ul ta t ive Com m i t tee In tern a t ional Te le p h on e and Te legra p h C C M S C on tent Com pi la t ion Ma n age ment Syste m C C S C a bin Com mun ic a t ion Syste m C C U C on trol and Com pe n sa t ion Un i t C C W C o un terc lockwi se CD ( 1 ) C a rrier De tect ( 2 ) C h rom i n a nce Differe nce ( 3 ) C om pact Disc C DA C oordi n a t i ng Des ign Au th ori ty C D B R C a bin Da ta Bus Re pea ter C D G C onfigu ra t ion Da ta ba se Ge n era tor CDI C o u r se Devia t ion In dic a tor CDL C a bin Disc re pa ncy Log C D M C ol la bora t ive Dec i s ion Maki ng C D M S C ol la bora t ive Dec i s ion Maki ng Syste m CDP C on t i nu o us Da ta Progra m CDR C ri t ical Des ign Review CD- R O M C om pact Disc Rea d - O nly Me m ory C D S ( 1 ) C a bin Distri b u t ion Syste m ( 2 ) C om m on Display Syste m C D T I C ock pit Display of Traffic Inform a t ion CD U C on trol Display Un i t C E P T C onfere nce Europèene des Postes et Te l è c om mun ic a t ion s 1 8 2 1 C o m p a s s A low - powered ra dio beac on , used in con j unct ion L o c a t o r wi th ILS. A c om pa ss loc a tor has a two - le t ter id e n t i fic a t ion and a ra nge of at lea st 15 miles. CO M P C om pressor CO N C on t i nu o us Cone of An inverted con ical shaped area exte n di ng vert ic a l ly C o n f u s i o n a bove a VOR gro und fac i l i ty that is void of th e bea ri ng sign a l . CO N O P S C oncept of Opera t ion s C o n s o l a n A low - freque nc y, keyed, C W, s h ort ba seline syste m us i ng two antennas to ra dia te a daisy - s h a ped pa t tern for naviga t ional aid purposes. The freque ncy ra nge is in the 300 kHz region . It is in limited use tod ay. C o n t o u r C on tour or iso - c on tour refers to a wea th er ra d a r di s play prese n ta t ion that bla nks the echo re t u rns in the ce n ter of a storm ce l l . The area bla nked out is c a l led con tour and corres pon ds to the re t u rn leve l s that exceed a pred e term i n ed th res h old. C O N U S C on t i n e n tal Un i ted Sta tes C O P C h a racter- O rie n ted Pro toc ol CO ROUTE C om pa ny Ro u te C o r r e c t i o n A c orrect ion is appl ied to sta t ic so u rce press u re ( S S E C ) mea s u re me n ts to pa rtly or com ple te ly correct for press u re errors that are caused by airflow ch a nges. It is c om p u ted as a funct ion of Mach and altitude ba sed on mea s u red errors for a pa rt icular sta t ic syste m . Corrective A resol u t ion advi sory that instructs the pi lot to A d v i s o r y d evia te from cu rrent vert ical ra te (e. g. DON’ T C LIMB when the airc raft is climbi ng ). ( TCA S ) C OT P C on n ect ion Orie n ted Tra n s port Pro toc ol C OT S C om merc ial Off - T h e - S h e l f C P ( 1 ) C i rcular Pola riz a t ion ( 2 ) C onfl ict Pro be ( 3 ) C on trol Pa n e l C PA C losest Point of A p proach C M C on text Ma n age me n t CM A C e n tral Ma i n te n a nce A p pl ic a t ion CMC C e n tral Ma i n te n a nce Com p u ter CMCF C e n tral Ma i n te n a nce Com p u ter Funct ion CMCS C e n tral Ma i n te n a nce Com p u ter Syste m CMD C om m a n d C M F C om m on Message Form a t CMM ( 1 ) C om m on Mode Mon i tor. A type of mon i tor c om m on to au tom a t ic fl ight con trol syste m s. ( 2 ) C om ponent Ma i n te n a nce Ma nu a l CMN C on trol Mo t ion Noi se C M P C onfigu ra t ion Ma n age ment Pla n CMS C a bin Ma n age ment Syste m C M O S C om ple me n ta ry Me tal Oxide Se m ic on ductor CM U C om mun ic a t ions Ma n age ment Un i t C N D B C ustom ized Naviga t ion Da ta ba se CN E S C e n tre national d’ e t u d es spa t ia les C/N O C a rrier- to - Noi se De n s i ty Ratio C N P C om m / Nav / P ul se CN S C om mun ic a t ion , Naviga t ion , S u rve i l la nce CN S / AT M C om mun ic a t ion , Naviga t ion , S u rve i l la nce / Air Traffic Ma n age me n t C o a s t e d A track that is con t i nued ba sed on previo us track Tr a c k ch a racteri st ics in the abse nce of surve i l la nce data re ports (TCA S ). CO D E C C od er / Dec od er C O M C ock pit Opera t i ng Ma nu a l C O M / M E T / O P SC om mun ic a t ion s / Me teorologic a l / O pera t ion s CO M M C om mun ic a t ion s 2 0 2 3 C S C om m on Service CS C C a rgo System Con trol ler C S C I C om p u ter Softwa re Configu ra t ion Ite m CSCP C a bin System Con trol Pa n e l CS D B C om merc ial Sta n d a rd Da ta Bus CS D S C a rgo Smoke De tector Syste m CS E U C on trol Systems Electron ics Un i t C S F C om m a n d / S ta t us Fra me C S M A C a rrier Se n se Mul t i ple Access C S M A / C D C a rrier Se n se Mul t i ple Access wi th Col l i s ion CS M M C rash Surviva ble Me m ory Modules CS M U C a bin System Ma n age ment Un i t C/S O I T C om mun ic a t ion s /S u rve i l la nce Opera t ion a l Im ple me n ta t ion Tea m CS U C onfigu ra t ion Stra p pi ng Un i t C TA ( 1 ) C on trol Area (ICAO Term ) ( 2 ) C on trol led Ti me of Arriva l C TA F C om m on Traffic Advi sory Freque nc y CTA I C owl T h ermal An t i - Ic i ng CTA S C e n ter Trac on Au tom a t ion Syste m C TC C a bin Te m pera t u re Con trol ler CT L C on trol CT M O C e n tra l ized Air Traffic Flow Ma n age me n t O rga n iz a t ion CTO L C onve n t ional Take Off and Landi ng C T R ( 1 ) C e n ter ( 2 ) C on trol zon e CT R D C onfigu ra t ion Test Requi re me n ts Docume n t C T R L C on trol CP C ( 1 ) C a bin Press u re Con trol ler ( 2 ) C on trol ler Pilot Com mun ic a t ion ( 3 ) C u r sor Pos i t ion Con trol CPCI C om p u ter Program Configu ra t ion Ite m . A CPCI num ber id e n t i fies the configu ra t ion of a com p u ter softwa re progra m . C P C S C a bin Press u re Con trol Syste m C P D L C C on trol ler- P i lot Da ta Link Com mun ic a t ion s CP E C i rcular Pos i t ion Error CP M C ore Processor Module CPN C ollins Pa rt Num ber CP R S R C om pressor CP S C a bin Press u re Se n sor CP U C e n tral Process i ng Un i t C / R C om m a n d / Res pon se CR ( 1 ) C h a nge Request ( 2 ) C on tra st Ratio CR C ( 1 ) Cyc l ic Redun d a ncy Checki ng ( 2 ) Cyc l ic Redun d a ncy Cod e CR E S C orros ion Res i stant Stee l C R D C u rrent Ro u t i ng Dom a i n C R DA C oo pera t ive Resea rch and Deve lo pment Agree me n t C R M ( 1 ) C ock pit Reso u rce Ma n age me n t ( 2 ) C ol l i s ion Risk Mod e l ( 3 ) C rew Reso u rce Ma n age me n t CR PA C on trol led Rece p t ion Pa t tern An te n n a C R R C u tover Rea di n ess Review CR S C o u r se CR T C a th ode Ray Tu be C R U C om p u ter Rece iver Un i t CR Z C rui se 2 2 2 5 DA S Des ign a ted A l tera t ion Sta t ion Data Link A system that allows exch a nge of digi tal data over an RF link. ATC SS is a data link system used by the air traffic con trol syste m . ACA RS is a data link syste m used by airline com m a n d, c on trol and manage me n t syste m , us i ng VHF com mun ic a t ion freque nc ies. D-AT I S D igi tal Au tom a t ic Terminal Inform a t ion Syste m D B Da ta ba se d B Dec i be l d B A Dec i bels Ad j usted D B i ( 1 ) Dec i bels above iso to pic circula r ( 2 ) Dec i bels refere nced to an iso to pic ante n n a D B I Downl i nk Block Id e n t i fier d B m Dec i bel(s) be low 1 m i l l i wa t t D B M X Da ta ba se Ma n age ment Syste m D B S D i rect Broa d c a st Sa te l l i te D B w Dec i bels refere nced to 1 wa t t d B W Dec i be l -Wa t ts D B U Da ta ba se Un i t D C D i rect Curre n t D C A S D igi tal Con trol Au dio Syste m D C D Do u ble Channel Duplex . A c om mun ic a t ion system us i ng two RF ch a n n e l s, one channel for rece ive and one channel for transmit opera t ion s, for simul ta n eo us c om mun ic a t ion . D C E Da ta Com mun ic a t ions Equi pme n t D C G F Da ta Conver s ion Ga teway Funct ion D C M F Da ta Com mun ic a t ion Ma n age ment Funct ion D C M S Da ta Com mun ic a t ion Ma n age ment Syste m D C N ( 1 ) Des ign Change No t ice ( 2 ) Document Change No t ice ( 3 ) D rawi ng Change No t ice CT S C lear To Se n d CT U C a bin Te lec om mun ic a t ions Un i t C U ( 1 ) Channel Utiliz a t ion ( 2 ) C om bi n er Unit (HUD) ( 3 ) C on trol Un i t C / U T C od e / Unit Test C V / D F D R C ock pit Voice and Digi tal Fl ight Da ta Rec ord er CVR C ock pit Voice Rec ord er CVR C P C ock pit Voice Rec ord er Con trol Pa n e l CW ( 1 ) C lockwi se (cw) ( 2 ) C on t i nu o us Wave. A c on t i nu o us train of id e n t ical osc i l la t ion s. C W C C om pa ra tor Wa rn i ng Com p u ter CW I C on t i nu o us Wave In terfere nce CW P ( 1 ) C on trol led Wor ki ng Pos i t ion ( 2 ) C on trol ler Wor ki ng Pos i t ion CW S C on trol W h eel Steeri ng D 8 P S K D i ffere n t ial Eight Phase Shift Keyi ng D & O Desc ri p t ion and Opera t ion DA ( 1 ) Descent Advi sor ( 2 ) D ri ft Ang le D / A D igi ta l - to - An a log DA B S D i sc re te Ad dressa ble Beac on Syste m DA D C D igi tal Air Da ta Com p u ter DA D S D igi tal Air Da ta Syste m DA P D igi tal Service Access Product DA R C D i rect Access Radar Channel. An independent back u p to main ATC com p u ter s. DA R PA Defe n se Adva nced Resea rch Projects Age nc y DA R P S D yn a m ic Ai rc raft Ro u te Pla n n i ng Study 2 4 2 7 D e m a n d An ACA RS mode of opera t ion in wh ich M o d e c om mun ic a t ions may be initia ted by the gro un d processor or the airborne syste m . D E P De pa rt u re D E R Des ign a ted Engi n eeri ng Re prese n ta t ive D E S Desce n t D E S C R Desc ri p t ion D e s e n s i t i z a t i o n TCAS se n s i t ivi ty level (th reat vol ume) reduct ion D E S T Dest i n a t ion D E V Devia t ion D FA D i rect ion Fi n di ng An te n n a DFCS D igi tal Fl ight Con trol Syste m D F DA F D igi tal Fl ight Da ta Acqui s i t ion Funct ion D F DA M U D igi tal Fl ight Da ta Acqui s i t ion Ma n age ment Un i t D F DAU D igi tal Fl ight Da ta Acqui s i t ion Un i t . The DF DAU sa m ples, c on di t ions and digi t izes the fl ight data . DFDR D igi tal Fl ight Da ta Rec ord er D F D U D igi tal Fl ight Da ta Un i t DFI D U Dual Funct ion In teract ive Display Un i t DFI U D igi tal Fl ight In strument Un i t D F S D igi tal Freque ncy Se lect D F U D igi tal Funct ion Un i t D G D i rect ional Gyro D G N S S D i ffere n t ial Glo bal Naviga t ion Sa te l l i te Syste m D G P S D i ffere n t ial Glo bal Pos i t ion i ng Syste m D H ( 1 ) Da taflash Hea d er ( 2 ) Dec i s ion He ig h t D I Da ta In terru p t D I AG S D iagra m s D I D Da ta Item Desc ri p t ion D C P D i s play Con trol Pa n e l D C S Do u ble Channel Simplex . A c om mun ic a t ion syste m us i ng two RF channels for non - s i mul ta n eo us c om mun ic a t ion . One channel is di sa bled wh i le the o th er channel is used to tra n s m i t . D C U Da ta Conce n tra tor Un i t D C V D i rect ional Con trol Va lve D D Da ta De l ivery D DA ( 1 ) D igi tal Differe n t ial An a lyzer ( 2 ) D i sta nce Da ta Ad a p ter D D D Dual Disk Drive D D I D i rect Dial In dic a tor D D M D i ffere nce in De p th of Modula t ion D D P Dec la ra t ions of Des ign and Perform a nce. A c on trol d ocument requi red by the Un i ted Ki ngd om Civi l Avia t ion Au th ori ty (CAA) for cert i fic a t ion of avion ic s equi pme n t . D D R D raft Document Review D D S D i rect Digi tal Syn th es izer D D T Downl i nk Da ta Tra n sfer D D TC Da ta Link De l ivery of Expected Ta xi Clea ra nces D E C C A A n aviga t ion system wid e ly used by shippi ng in E u ro pe. The gro und fac i l i t ies con s i st of a master sta t ion and several slave sta t ion s. D e c i m a l Ba se -10 coun t i ng syste m . N um bers include 0, 1, 2, 3, 4, 5, 6, 7, 8, 9. d e d Dedic a ted D E F DA R S D igi tal Expa n d a ble Fl ight Da ta Acqui s i t ion and Rec ordi ng Syste m D E F L Deflect ion D E G Degree D E L De le te 2 6 2 9 D L U Download Un i t D M D i sc on n ected Mod e D M A D i rect Me m ory Access D M E D i sta nce Mea s u ri ng Equi pme n t . A system th a t provid es di sta nce inform a t ion from a gro und sta t ion to an airc raft . D M E / N Ab brevia t ion for a DME normal syste m D M E / P Ab brevia t ion for a DME prec i s ion syste m D M I R Des ign a ted Ma nu fact u ri ng In s pect ion Re prese n ta t ive D M M ( 1 ) Da ta Me m ory Module ( 2 ) D igi tal Mul t i me ter D M N Da ta Mul t i plexi ng Ne twor k D M S De bris Mon i tori ng Se n sor D M U Da ta Ma n age ment Un i t D O- 1 6 0 RTCA Document 160, Envi ronme n tal Con di t ions and Test Procedu res for Ai r borne Equi pme n t , Iss ued 12 / 04 / 89 D O- 1 7 8 RTCA d ocument 178, Softwa re Con s id era t ions in Ai r borne Systems and Equi pment Cert i fic a t ion , Iss ued 03 / 22 / 85 D O C Docume n ta t ion D O D De pa rtment of Defe n se D O O R S D yn a m ic Object Orie n ta ted Requi re me n ts Syste m Doppler The ch a nge in freque ncy observed at the rece iver E f f e c t when the tra n s m i t ter and rece iver are in motion re la t ive to each oth er. D O S Disk Opera t i ng Syste m D OT De pa rtment of Tra n s porta t ion D OT S D yn a m ic Ocean Tracki ng Syste m D o w n l i n k The ra dio tra n s m i ss ion pa th downwa rd from th e a i rc raft to the ea rth . d p i d o ts per inch D I P ( 1 ) Da ta In terrupt Progra m ( 2 ) Dual In-line Pack age. The most com m on pack age configu ra t ion for integra ted circui ts. D I R D i rector D i r e c t e d A DME opera t i ng mode that allows an FMCS to M o d e se lect one to five DME sta t ions for interroga t ion . D I R / I N TC D i rect In terce p t D I S C D i sc on n ect D I S C H D i sch a rge D I S C R D i sc re pa nc y D I S T D i sta nce D I T S Da ta Inform a t ion Tra n sfer Syste m D L ( 1 ) Da ta Link ( 2 ) Downl i nk D L A P Da ta Link A p pl ic a t ion Processor D L C Da ta Link Con trol Display Un i t D L C I Da ta Link Con trol Id e n t i fier D L E Da ta Link En t i ty D L G F Da ta Load Ga teway Funct ion D L I Da ta Link In terpre ter progra m D L K Da ta Link (AEEC ) D L L Da ta Link Libra ry D L M Da ta Link Ma n age ment Un i t D L M E Da ta Link and Message Engi n eeri ng D L / M S U Da ta Loa d er / Ma ss Storage Un i t D LO D S D uct Leak and Overh eat De tect ion DLP Da ta Link Processor D L S Da ta Load Syste m D LT D igi tal Lineal Ta pe - used for the storage of vid eo and au dio fi les 2 8 3 1 D T M F Dual Tone Mul t i - Freque nc y D T M De m on stra t ion Test Mileston e D T P D U Da ta Pro toc ol Da ta Un i t D T U Da ta Tra n sfer Un i t D U D i s play Un i t Dual Mode An airborne DME RT c a pa ble of process i ng DME / N D M E and DME/P gro und sta t ion sign a l s. O pera t ion is in the L-band freque ncy ra nge. D UAT D i rect User Access Term i n a l D u p l ex A c om mun ic a t ion opera t ion that uses th e s i mul ta n eo us opera t ion of the transmit and rece ive equi pment at two loc a t ion s. DV F De m on stra t ion and Va l id a t ion Fac i l i ty DV M D igi tal Vol tme ter DWA N D i rect WA N D X D i sta nce D y n a m i c D yn a m ic Press u re is the di ffere nce be tween pi tot and P r e s s u r e sta t ic press u re. D y n a m i c RAM con structed of capac i tor ele me n ts. Me m ory R A M cells must be periodic a l ly refres h ed to keep capac i tor s from di sch a rgi ng and los i ng data . ( See “S ta t ic RA M” ) E E a st E A A E xperi me n tal Ai rc raft Assoc ia t ion E A D I Electron ic Attitude Director In dic a tor E A I Engine An t i - Ice E A P Engine A lert Processor E A R O M Electric a l ly A l tera ble ROM E A R T S En ro u te Au tom a ted Radar Tracki ng Syste m E A S E quiva lent Ai r s peed E A S I E Enh a nced ATM and Mode S Im ple me n ta t ion in Euro pe D P R Dual Port RA M D P S K D i ffere n t ial Phase Shift Keyi ng D R ( 1 ) Da ta Rec on i ng ( 2 ) Da ta Rece p tac le D R E R Des ign a ted Radio Engi n eeri ng Re prese n ta t ive (FA A ) Drift Angle The ang le be tween hea di ng and track. It is due to the effect of wind cu rre n ts. Some t i mes called the c rab ang le. D R N Document Re lea se No t ice D S A D D igi tal Service Access Device D S A R C Defe n se System Acqui s i t ion Review Cyc le D S B Do u ble Side Ba n d.An AM signal wi th the carrier re m oved. Requi res the sa me ba n dwidth as the AM sign a l . D S D U Da ta Signal Display Un i t D S F D i s play System Funct ion D S P ( 1 ) D igi tal Signal Processor ( 2 ) D i s play Se lect Pa n e l ( 3 ) Domain Spec i fic Pa rt D S P D R V D i s play Driver D S P Y D i s play (annunc ia t ion on CDU ) D S R D i s play System Re place me n t D S S Dec i s ion Support Syste m s D S S S D i rect Seque nce Spread Spectrum D S U ( 1 ) Da ta Sign a l i ng Un i t ( 2 ) Domain Service Un i t D T D ( 1 ) Da ta Terminal Display ( 2 ) Document Type Defi n i t ion D T E Da ta Terminal Equi pme n t DT & E Deve lo pment Test and Eva l u a t ion D T G D i sta nce - to - go 3 0 E D D S Electron ic Document Distri b u t ion Service E D I Engine Da ta In terface E D I F Engine Da ta In terface Funct ion E D I U Engine Da ta In terface Un i t E D M S Electron ic Da ta Ma n age ment System E D P ( 1 ) Electron ic Da ta Process i ng ( 2 ) Engine Driven Pum p ( 3 ) Engi n eeri ng Deve lo pment Pa l le t E D U Electron ic Display Un i t E E Electron ics Equi pment (e. g. E E- Bay ) E E C Electron ic Engine Con trol E E P R O M Electrical Era sa ble Progra m m a ble Read Only Me m ory E E U E LMS Electron ics Un i t E F C E xpected Fu rth er Clea ra nce E F D Electron ic Fl ight Display E F D R E xpa n d ed Fl ight Da ta Rec ord er E F I C Electron ic Fl ight In strument Con trol ler E F I P Electron ic Fl ight In strument Processor EFI S Electron ic Fl ight In strument Syste m EFIS CP E FIS C on trol Pa n e l E G I H O E xpedi ted Gro und In i t ia ted Ha n d off E E LV Evolved Expe n d a ble Launch Ve h ic le E G N O S E u ro pean Geosta t ion a ry Overlay Syste m E G P E xterior Ga teway Pro toc ol E G P W S Enh a nced Gro und Proxi m i ty Wa rn i ng Syste m E GT E x h aust Gas Te m pera t u re E H S I Electron ic Horizon tal Situation In dic a tor E H V Electro - Hydraul ic Va lve E ATC H I P E u ro pean Air Traffic Con trol Ha rm on iz a t ion and In tegra t ion Progra m me E AT M S E u ro pean Air Traffic Ma n age ment Syste m s E B AC E E u ro pean Bus i n ess Avia t ion Conve n t ion and E x h i bi t ion E C Event Cri terion E C AC E u ro pean Civil Avia t ion Confere nce E C A M Electron ic Cau t ion A lert Module E C A R S Enh a nced ACA RS E C E F E a rth - C e n tered, E a rth - Fi xed E c h o The port ion of the ra dia ted energy reflected back to the antenna from the ta rget (WXR). E C M Electron ic Con trol Module E C M P Electron ic Com ponent Ma n age ment Syste m E C O N E c on omy (minimum cost speed sch edule ) E C P E ICAS Con trol Pa n e l E C S ( 1 ) Engi n eeri ng Com pi ler Syste m . An au tom a ted d a ta storage syste m . ( 2 ) Envi ronme n tal Con trol Syste m ( 3 ) Event Cri terion Subfie ld E C S L Left Envi ronme n tal Con trol System Card E C S M C EC S M i sce l la n eo us Card E C S R Right Envi ronme n tal Con trol System Card E C U ( 1 ) E ICAS Con trol Un i t ( 2 ) Electron ic Con trol Un i t ( 3 ) E xternal Com pe n sa t ion Un i t E D E ICA SD i s play E / D En d - of - Desce n t E DA Electron ic Des ign Au tom a t ion E DAC E rror De tect ion and Correct ion ( used interch a ngea bly wi th EDC ) E D C E rror De tect ion and Correct ion 3 2 3 3 3 5 E O M End Of Message E OT End Of Text E P E xternal Power E P C E xternal Power Con tactor E P C S Engine Pro p ul s ion Con trol Syste m E- P I R E P S Electron ic Pilot Re ports E- P l a n e The E- Plane is the plane of an antenna that con ta i n s the electric fie ld.The pri nc i pal E- Plane also con ta i n s the di rect ion of maxi mum ra dia t ion . E P L D Electric a l ly Progra m m a ble Logic Device E P P Enh a nced Pa ra l lel Port E P R Engine Press u re Ratio E P R O M E ra sa ble Progra m m a ble ROM E P S Electrical Power Syste m E Q U I P E qui pme n t E q u i v a l e n t E quiva lent Ai r s peed is a di rect mea s u re of th e Airspeed i nc om press i ble freestream of dyn a m ic press u re. ( E A S ) It is CAS corrected for com press i bi l i ty effects. ER PDU E cho Re ply Pro toc ol Da ta Un i t E R A E u ro pean Regional Ai rl i n es Assoc ia t ion E R B Engi n eeri ng Review Boa rd E R D End Ro u t i ng Dom a i n E R D I En Ro u te Domain Infra struct u re E R E E xternal Roll Extrus ion E R P Eye Refere nce Poi n t ERP PDU E cho Re ply Pro toc ol Da ta Un i t ERQ PDU E cho Request Pro toc ol Da ta Un i t E R U Engine Re lay Un i t E S End Syste m E I A Electron ic In dustries Assoc ia t ion E I C A S Engine In dic a t ion and Crew A lert Syste m E I C A S C Engine In dic a t ion and Crew A lert System Con trol s E I P I E xte n d ed In i t ial Pro toc ol Id e n t i fier E I R P E a rth Inc ident Radia ted Power E I S ( 1 ) Electron ic In strument Syste m ( 2 ) Engine In dic a t ion Syste m E I S A E xte n d ed In dustry Sta n d a rd Arch i tect u re E I U E FIS / E ICAS In terface Un i t E L / F C G Electron ic Log book and Fault Correct ion Guid e E L B / I S E Electron ic Log book In - Service Eva l u a t ion E L C E m i t ter Coupled Logic E L E C Electric a l E L M E xte n d ed Le ng th Message E L M S Electrical Load Ma n age ment Syste m ELS Electron ic Libra ry System E LT E merge ncy Loc a tor Tra n s m i t ter E M Ele ment Ma n ager E M C ( 1 ) Electrom agn e t ic Com pa t i bi l i ty ( 2 ) En terta i nment Mul t i plexer Con trol ler E M E R E merge nc y E M I Electro - Magn e t ic In terfere nce E M S ( 1 ) E merge ncy Medical Services ( 2 ) Engine Ma n age ment Syste m E N G Engi n e E N O C Engi n eeri ng Ne twor k O pera t ions Center E N Q En qui re E / O Engi n e - O u t E O D End Of Day 3 4 3 7 E U R E u ro pea n E U R AT N E u ro pean AT N E U R E T E u ro pean Tra n s port E u r o c a e E u ro pean Orga n iz a t ion for Civil Avia t ion Electron ic s. A regula tory age ncy for avion ics cert i fic a t ion in E u ro pe. E U R O-C O N T R O L E u ro pean Orga n iz a t ion for the Safe ty of Ai r Naviga t ion Opera t ion s E V E a rn ed Va l ue E V M E rror Vector Magn i t u d e E V S Enh a nced Vi s ion Syste m E X E C E xecu t ive F Fah re nh e i t FA Final A p proach FA A ( 1 ) Fed eral Avia t ion Adm i n i stra t ion (U. S.) ( 2 ) Fed eral Avia t ion Au th ori ty FA ATC FA A Tech n ical Center (U. S.) FAC Fl ight Augme n ta t ion Com p u ter FA D E C Full Au th ori ty Digi tal Electron ic Con trol FA F Final A p proach Fi x FA I Fi r st Art ic le In s pect ion Fan Marke r A m a r ker beac on used to provide id e n t i fic a t ion of pos i t ions along airways. S ta n d a rd fan marker produces an elliptic a l - s h a ped pa t tern . A sec ond type produces a dum b be l l - s h a ped pa t tern . FA N S Fu t u re Air Naviga t ion Syste m FA R ( 1 ) Fed eral Acqui s i t ion Regula t ion ( 2 ) Fed eral Avia t ion Regula t ion FA S T Final A p proach Spac i ng Tool FAT Factory Acce p ta nce Test F B L Fly - By - L ig h t E S A E u ro pean Space Age nc y E S A S ( 1 ) Electron ic Situation Awa re n ess Syste m ( 2 ) Enh a nced Situational Awa re n ess Syste m E-S c a n Electron ic Sc a n n i ng E S D Electrosta t ic Disch a rge E S D S Electrosta t ic Se n s i t ive Devices. A l so kn own as ESSD. E S H End System He l lo E S I D Engine and System In dic a t ion Display E S I S Engine and System In dic a t ion Syste m E S R En ergy Storage / C on trol E S S ( 1 ) Electron ic Swi tch i ng Syste m ( 2 ) Envi ronme n tal Stress Sc ree n i ng E S S D Electro S ta t ic Se n s i t ive Devices. See also ESDS. E S T E st i m a ted E S U Envi ronme n tal Se n sor Un i t E TA E st i m a ted Ti me of Arriva l E T B ( 1 ) End of Block (ASC I I / IA5 ch a racter ) ( 2 ) Engi n eeri ng Test Ba n d E T D E st i m a ted Ti me of De pa rt u re E T I Ela psed Ti me In dic a tor E T M Ela psed Ti me Mea s u re me n t E T M S Enh a nced Traffic Ma n age ment Syste m E TO P S E xte n d ed Twin Engine Opera t ion s E T P E qual Ti me Poi n t E T R C E xpected Ta xi Ramp Clea ra nces E T V S Enh a nced Terminal Voice Swi tch E T X End of Tra n s m i ss ion E UA F S Enh a nced Upper Air Forec a st Syste m E U P S E xternal Un i n terru p t i ble Power Supply 3 6 3 9 F D R S Fl ight Da ta Rec ord er Syste m F D S Fl ight Display Syste m F D U Fl ux De tector Un i t F E AT S Fu t u re Euro pean Air Traffic Ma n age ment Syste m F E C Forwa rd Error Correct ion F E P Front End Processor F F Fuel Flow F G C Fl ight Guid a nce Com p u ter F H A Funct ional Haz a rd Assess me n t F H S S Freque ncy Ho p ped Spread Spectrum F H W Fault History Word F I B Forwa rdi ng Inform a t ion Ba se F I F O Fi r st In , Fi r st Out F I M Fault Isola t ion Ma nu a l F I R Fl ight Inform a t ion Region F I S ( 1 ) Fl ight Inform a t ion Service ( 2 ) Fl ight Inform a t ion Syste m ( 3 ) Fl ight In strument Syste m F I S- B Fl ight Inform a t ion Services - Broa d c a st F I X Pos i t ion in space, us u a l ly on airc raft ’s fl ight pla n F L ( 1 ) Fl ight Level (as in FL 410 ). This term i n ology is used to desc ri be airc raft attitude when th e a l t i me ter is set at QNE. ( 2 ) Foot Lambert F L C H Fl ight Level Change FLIR Forwa rd Loo ki ng Infra - Red F L M Fl ight Line Ma i n te n a nce F LT Fl ig h t F LTA Forwa rd Loo ki ng Terrain Avoid a nce F LT C T R L Fl ight Con trol F B O Fi xed Ba se Opera tor F B W Fly - By -Wi re F C Foot Candles F C A Funct ional Configu ra t ion Au di t F C A F Fl ight Da ta Acqui s i t ion F C C ( 1 ) Fed eral Com mun ic a t ions Com m i ss ion ( 2 ) Fl ight Con trol Com p u ter F C D C Fl ight Cri t ical dc F C P ( 1 ) Fl ight Con trol Pa n e l ( 2 ) Fl ight Con trol Processor F C S ( 1 ) Fl ight Con trol Syste m ( 2 ) Fra me Check Seque nce F D ( 1 ) Final Da ta ( 2 ) Fl ight Director ( 3 ) Fl ight Dyn a m ic s F DA F Fl ight Da ta Acqui s i t ion Funct ion F DAU Fl ight Da ta Acqui s i t ion Un i t F D B Fl ight Plan Da ta Ba nk F D E Fl ight De tect ion Exc l us ion F D D I Fi ber Distri b u ted Da ta In terface F D E P Fl ight Da ta En try Pa n e l F D H Fl ight Deck Ha n dse t F D I Fault De tect ion and Isola t ion F D I O Fl ight Da ta Inp u t / O u tp u t F D M Freque ncy Divi s ion Mul t i plex . A system wh ere th e messages are tra n s m i t ted over a com m on pa th by e m ployi ng a di fferent freque ncy band for each sign a l . F D M A Freque ncy Divi s ion Mul t i ple Access F D P S Fl ight Da ta Process i ng Syste m F D R Fl ight Da ta Rec ord er 3 8 4 1 F Q R Formal Qualific a t ion Review FR From F R A Flap Re tract ion A l t i t u d e F R A D Fra me Re lay Access Device Framing A p ul se that is used to mark the begi n n i ng or end P u l s e of the cod ed re ply pul ses. F R E E R Free - Ro u te Experi me n tal Enc o un ter Resol u t ion Free Scan A DME opera t i ng mode that will provide di sta nce M o d e d a ta to all DME gro und sta t ions wi thin the DME ra nge (LOS ). F R E Q Freque nc y Frequency The abi l i ty of a rece iver- tra n s m i t ter to ra pidly and c on t i nu a l ly shift opera t i ng freque nc y. F R M Fault Re port i ng Ma nu a l F R M R Fra me Re ject F R P Fed eral Radion aviga t ion Pla n F R PA Fi xed Rece p t ion Pa t tern An te n n a F R Q Freque nc y F S A S Fl ight Service Au tom a t ion Syste m F S E Fie ld Service Engi n eer F S E U Flap Slat Electron ics Un i t F S F Fl ight Safe ty Fo un d a t ion F S S Fl ight Service Sta t ion F T Funct ional Test F T E Fl ight Tech n ical Error F T P Fi le Tra n sfer Pro toc ol F T P P Fault Tolerant Power Pa n e l F W Fa i l u re Wa rn i ng F W C Fl ight Wa rn i ng Com p u ter F LT I N S T Fl ight In strume n t F LW Forwa rd Loo ki ng Wi n ds h ear Radar F M Freque ncy Modula t ion F M A Fl ight Mode An nunc ia tor F M C ( 1 ) Fl ight Director Con trol (FD) ( 2 ) Fl ight Ma n age ment Com p u ter (FMC S ) F M C F Fl ight Ma n age ment Com p u ter Funct ion F M C S Fl ight Ma n age ment Com p u ter Syste m F M C W Freque nc y - Modula ted Con t i nu o us Wave F M E A Fa i l u re Mode and Effects An a lys i s F M F Fl ight Ma n age ment Funct ion F M P Fl ight Mode Pa n e l F M S Fl ight Ma n age ment Syste m F M U Fuel Me teri ng Un i t F / O ( 1 ) Fi r st Officer ( 2 ) Fuel/Oil Cooler F O C ( 1 ) Fuel/Oil Cooler ( 2 ) Full Opera t ional Capa bi l i ty F O G Fi ber Optic Gyro F O Q A Fl ight Opera t ions Quality Ass u ra nce F PA ( 1 ) Fl ight Pa th Ang le ( 2 ) Focal Plane Array FPAC Fl ight Pa th Acce lera t ion FP C Fl ight Profi le Com pa ra tor FP G A Fie ld Progra m m a ble Ga te Array FP M Feet Per Minu te F P V Fl ight Pa th Vector F Q I S Fuel Quantity In dic a t i ng Syste m F Q P U Fuel Quantity Processor Un i t 4 0 4 3 G GT F M G ro un d - G ro und Traffic Flow Ma n age me n t G G R G ro un d - G ro und Ro u ter G G S G lo bal Pos i t ion i ng System Gro und Sta t ion G H G ro und Ha n dl i ng G H z G igah ertz (bi l l ion hertz ) G I G roup Id e n t i fier G I B GN SS In tegri ty Broa d c a st G I C GN SS In tegri ty Channel G I C B G ro un d - In i t ia ted Com m - B G I G O Ga r bage - In Ga r bage - O u t G I H O G ro und In i t ia ted Ha n d off G L ( 1 ) G ro und Loc a t ion (ACA RS / AFE PS ) ( 2 ) G roup Le ng th G l i d e p a t h The approach pa th used by an airc raft du ri ng an i n strument la n di ng or the port ion of the glid es lo pe that inter sects the loc a l izer. The glid e pa th does not provide guid a nce com ple te ly to a to uch d own point on the runway. G l i d e s l o p e The vert ical guid a nce port ion of an ILS syste m . GLN S G PS Landi ng and Naviga t ion Syste m GLN U G PS Landi ng and Naviga t ion Un i t G LO N A S S G lo bal Naviga t ion Sa te l l i te Syste m GLS ( 1 ) G PS Landi ng Syste m ( 2 ) Gun Layi ng Syste m G L U G PS L a n di ng Un i t G M Guid a nce Ma teria l G M C G ro und Move ment Con trol G M T G ree nwich Mean Ti me. GM T is a un iver sal time sc a le ba sed upon the mean ang le of ro ta t ion of th e ea rth about its axis in re la t ion to the sun . It is refere nced to the pri me meridian that pa sses th ro ug h G ree nwich , Eng la n d. G M U G lo bal Ne twork Arch i tect u re F W D Forwa rd F W S Fl ight Wa rn i ng Syste m F Y D S Fl ight Director / Yaw Da m per Syste m G A ( 1 ) Ge n eral Avia t ion ( 2 ) Go Aro un d G A A S Ga l i um Ar se n id e G AC S Ge n e t ic ATN Com mun ic a t ions Service G A I T G ro un d - ba sed Augme n ta t ion and In tegri ty G A M A Ge n eral Avia t ion Ma nu fact u rers Assoc ia t ion G AT M G lo bal Air Traffic Ma n age me n t G B S T G ro un d - Ba sed Softwa re Tool G b y t e G iga byte (bi l lon bytes ) G C A S G ro und Col l i s ion Avoid a nce Syste m G C B Ge n era tor Circuit Breaker G C C G ro und Cluster Con trol ler (ACA RS ) G C S G ro und Clutter Suppress ion G C U Ge n era tor Con trol Un i t G DLP G ro und Da ta Link Processor G D O P Geome tric Dilution Of Prec i s ion . A term referri ng to error introduced in a GPS calcula t ion due to th e pos i t ion i ng of the sa te l l i tes and the rece iver. G D P G ro und De lay Progra m G E N Ge n era tor G E O Geosta t ion a ry Earth Orbi t G E S G ro und Earth Sta t ion G F E Government Fu rn i s h ed Equi pme n t G F I Ge n eral Format Id e n t i fier G F S K Gauss ian Freque ncy Shift Keyi ng G G ( 1 ) G ra p h ics Ge n era tor ( 2 ) G ro un d - G ro un d 4 2 4 5 Gray Code S pec ial bi n a ry code used to transmit altitude data be tween fra m i ng pul ses of a tra n s pon d er re ply. A c yc l ic code havi ng only one digit ch a nge at a time. Used in Mode C to transmit airc raft ba rome tric a l t i t u d e. A l so kn own as Gilham cod e. G r o u n d A ra dio wave that travels along the ea rth’s surface. Wa v e G R P Geogra p h ic Refere nce Poi n t G S ( 1 ) G l id es lo pe ( 2 ) G ro und Speed G / S G l id es lo pe G S C G ro und Sta t ion Con trol ler (ACA RS ) G S E G ro und Support Equi pme n t G S I F G ro und Sta t ion Inform a t ion Fra me G S M G lo bal Systems Mo bi le G S M S G ro und Sta t ion Ma n age ment Syste m G S P G la re Shie ld Pa n e l G S V G ray Sc a le Vol tage ( s ) GT G rea ter T h a n GTA Ge n eral Terms Agree me n t GTC Da ta Link Gro und Terminal Com p u ter GT R Ge n eral Tech n ical Requi re me n ts G U I G ra p h ic / User In terface G V E G ra p h ics Vector Engi n e G W Ga teway G W S G ra p h ical Wea th er Services G y r o s c o p e A ro ta t i ng device that will maintain its original pla n e of ro ta t ion , no matter wh ich di rect ion the gyrosc o pe m o unt is turn ed. H A D Ha rdwa re Arch i tect u re Docume n t H A M S Hot Air Ma n age ment Syste m G N D G ro un d G N E G ross Naviga t ional Error G N R G lo bal Naviga t ion Rece iver G N S S G lo bal Naviga t ion Sa te l l i te Syste m G N S S P G lo bal Naviga t ion Sa te l l i te System Pa n e l G o n i o m e t e r A d evice that com bi n es the two signals from two loo p a n te n n a s. The gon iome ter (or resolver) con tains two fi xed coils and one ro ta t i ng coi l . The ro ta t i ng coil is c on n ected to the A DF bea ri ng indic a tor needle to i n dic a te the re la t ive bea ri ng from the airc raft to th e N DB sta t ion . The mech a n ical pos i t ion of the ro tor re prese n ts the bea ri ng of the sta t ion , and the pos i t ion is electric a l ly tra n s m i t ted to the RMI. G O S G rade of Service G O S I P Government Open Systems In terc on n ect ion Profi le G PA D I R S G lo bal Pos i t ion i ng, Air Da ta , In ert ial Refere nce Syste m G P I B Ge n eral Purpose In strument Bus G P P Ge n eral Purpose Processor G P S ( 1 ) G lo bal Pos i t ion i ng System (See NAVSTA R ) ( 2 ) G lo bal Pos i t ion i ng Sa te l l i te GPS L1 G lo bal Pos i t ion i ng System L1 Freque nc y G P S S U G lo bal Pos i t ion i ng System Se n sor Un i t G P U G ro und Power Un i t G P W C G ro und Proxi m i ty Wa rn i ng Com p u ter G P W S G ro und Proxi m i ty Wa rn i ng Syste m G R G ro und Ro u ter G R I B G rid d ed Bi n a ry (Na t ional Wea th er Service Mod e l O u tp u t ) G r a d i e n t The ra te at wh ich a va ria ble qu a n t i ty inc rea ses or dec rea ses. 4 4 4 7 H G C Head-Up Guid a nce Com p u ter H G S Head-Up Guid a nce Syste m H H L D Hea di ng Hold H I H ig h H I C Head Im pact Cri teria H I L Horizon tal In tegri ty Limit H I R F ( 1 ) H igh In te n s i ty Radia ted Fie ld ( 2 ) H igh In te n s i ty Radio Freque nc y H L C S H igh Lift Con trol Syste m H L E H ig h er Layer En t i ty H L L H igh Level Langu age H M I Human Machine In terface H M O S H igh De n s i ty Me tal Oxide Se m ic on ductor H M U He ight Mon i tori ng Un i t H O Ha n d off H O W Hand Over Word H P ( 1 ) H igh Press u re ( 2 ) Holdi ng Pa t tern H PA H igh Power Am pl i fier h Pa h ecto Pa sc a l H P C H igh Press u re Com pressor H - P l a n e The H-Plane is the plane in wh ich the magn e t ic fie ld of the antenna lies. The H-Plane is perpe n dicular to the E- Pla n e. H P R H ig h - Power Re lay H P R E S P ress u re A l t i t u d e H P S OV H ig h - P ress u re Shutoff Va lve H P T H ig h - P ress u re Tu r bi n e H R D Home Ro u t i ng Dom a i n H S A Horizon tal Sta bi l izer Act u a tor H A R S H igh Altitude Ro u te Syste m HCP Head-Up Con trol Pa n e l HCI Human Com p u ter In terface H C S Host Com p u ter Syste m H C W Heavi ly Cold Wor ked Pipe and Tu be (Sea n - Free ™ ) H D B K Ha n dboo k H D G Hea di ng HDG SEL Hea di ng Se lect H D I S K Ha rd Disk H D L Hy brid Da ta Link H D L C H ig h - Level Da ta Link Con trol H D L C- B H ig h - Level Da ta Link Con trol - Ba la nced H D L M S Hy brid Da ta Link Ma n age ment Syste m H D O P Horizon tal Dilution of Prec i s ion H D OT In ert ial Vert ical Speed H D P Ha rdwa re Deve lo pment Pla n H E Altitude Error H e a d i n g The di rect ion of an airc raft pa th wi th res pect to m agn e t ic or true north . H F H igh Freque nc y. The port ion of the ra dio spectrum from 3 to 30 MHz. HF com mun ic a t ion syste m s o pera te in the 2 to 30 MHz port ion of the spectrum . H F D L H ig h - Freque ncy Da ta Link H F D M HF Da ta Mod e m H F D R H igh Freque ncy Da ta Radio H F N P D U H igh Freque ncy Ne twork Pro toc ol Da ta Un i t H F S H igh Freque ncy Syste m H F S G Human Factor Study Gro u p H F S N L HF SubNe twor kL ayer H G A H igh Gain An te n n a 4 6 4 9 I A PA In strument A p proach Procedu res Au tom a t ion I A P S In tegra ted Avion ics Process i ng Syste m I A R P Inver se Ad dress Resol u t ion Pro toc ol IAS In dic a ted Ai r s peed is the speed indic a ted by a di ffere n t ial press u re airspeed indic a tor th a t mea s u res the actual press u re di ffere n t ial in the pi to t - sta t ic hea d. It is the actual instrument i n dic a t ion for a given fl ight con di t ion . I ATA In tern a t ional Air Tra n s port Assoc ia t ion I B AC In tern a t ional Bus i n ess Avia t ion Counc i l I C ( 1 ) In tegra ted Circui t ( 2 ) In terc a bi n e t I C AO In tern a t ional Civil Avia t ion Orga n iz a t ion (Mon trea l ) I C C IA PS Card Cage I C C A I A In tern a t ional Coordi n a t i ng Council of Aeros pace In dustries I C D ( 1 ) In sta l la t ion Con trol Drawi ng ( 2 ) In terface Con trol Drawi ng ( 3 ) In teract ive Des ign Center I C M In terline Com mun ic a t ions Ma nu a l I C M P In ternet Con trol Message Pro toc ol I C N I A In tegra ted Com mun ic a t ion s, Naviga t ion and Id e n t i fic a t ion Avion ic s I C P In i t ial Confl ict Pro be I C S S In tegra ted Com mun ic a t ion Swi tch i ng Syste m I C U In strument Com pa ra tor Un i t I D Id e n t i fier I D C In dic a tor Display / C on trol I d e n t The act ion of the tra n s pon d er tra n s m i t t i ng an extra p ul se along wi th its id e n t i fic a t ion code (at the request of a con trol ler ). I D I In i t ial Domain Id e n t i fier H S AC E Horizon tal Sta bi l izer Act u a tor Con trol Electron ic s H S- D S A D H igh Speed Fra me Re lay Service Access Device H S I Horizon tal Situation In dic a tor. An indic a tor th a t di s plays bea ri ng, g l id es lo pe, di sta nce, ra dio so u rce, c o u r se and hea di ng inform a t ion . H S I T Ha rdwa re and Softwa re In tegra t ion Test H S L Hea di ng Se lect H S R H igh Sta bi l i ty Refere nce H S R P Hot Sta n dby Ro u t i ng Pro toc ol H S TA Horizon tal Sta bi l izer Trim Act u a tor H TC H ig h est Two - way Channel H U D Head-Up Display H V P S H ig h -Vol tage Power Supply H W Ha rdwa re H W C I Ha rdwa re Configu ra t ion Ite m H X Heat Exch a nger H Y D Hydraul ic H Y D I M Hydraul ic In terface Module H z Hertz (cyc les per sec on d ) I2 S In tegra ted Inform a t ion Syste m I AC S P In tern a t ional Aeron au t ical Com mun ic a t ions Service Provid er I / F In terface I A 5 In tern a t ional A l p h a bet Num ber 5 I AG S In tegra ted A R INC Gro und Sta t ion I A N A In ternet Ass ign ed Num ber Au th ori ty I AOA In dic a ted Ang le - of - At tack I AO PA In tern a t ional Council of Ai rc raft Own ers and P i lo ts Assoc ia t ion s 4 8 5 1 I M C In strument Me teorological Con di t ion s I M G Im ple me n ta t ion Ma n age ment Gro u p I M I Im bed d ed Message Id e n t i fier I M O K I’m Ok ay I M PAT T Im pact Ava la nche and Transmit Ti me. This type of D i o d e diod e, when moun ted in an appro pria te cavi ty, produces mic rowave osc i l la t ions and ampl i fic a t ion . I n Inch I N B D ( 1 ) Inboa rd ( 2 ) Inbo un d I N D In dic a tor I n d i c a t e d The altitude above mean sea level (unc orrected A l t i t u d e for te m pera t u re ). I N F O Inform a t ion Fra me i n . h g. Inch es of Mercu ry I N I T In i t ia l iz a t ion I N J In ject ion I N M A R S AT In tern a t ional Ma ri t i me Sa te l l i te Orga n iz a t ion I N P H In terp h on e I N S In ert ial Naviga t ion Syste m . A se l f - c on ta i n ed, d ea d - reckon i ng system that se n ses the acce lera t ion a long the th ree axes of the airc raft and calcula tes th e di sta nce trave led from a refere nce poi n t . Accu racy of the system dec rea ses wi th res pect to time. I N S T In strume n t I N TC In terce p t I n t e r N I C In ternet Ne twork Inform a t ion Center I n t r u d e r An altitude re port i ng airc raft that is be i ng con s id ered as a po te n t ial th reat and processed by the th rea t d e tect ion logic (TCA S ). I / O Inp u t / O u tp u t . Refers to bi - di rect ional data ports. I D G In tegra ted Drive Ge n era tor I D P In i t ial Domain Pa rt I D R P In ter- Domain Ro u t i ng Pro toc ol I D S ( 1 ) Ice De tect ion Syste m ( 2 ) In tegra ted Display Syste m ( 3 ) Inform a t ion Display Syste m I D U In teract ive Display Un i t I E C IA PS Envi ronme n tal Con trol Module I E D In sert ion Extract ion Device I E E E In st i t u te of Electrical and Electron ic Engi n eer s I E P R In tegra ted Engine Press u re Ratio IF (if) In termedia te Freque nc y. A freque ncy to wh ich a s ignal is shifted as an in-be tween step in the rece p t ion or tra n s m i ss ion of a sign a l . I FA L PA In tern a t ional Fed era t ion of Ai rline Pilo ts Assoc ia t ion I FATC A In tern a t ional Fed era t ion of Air Traffic Con trol ler s’ Assoc ia t ion s I F E In - Fl ight En terta i nme n t IFP S In tegra ted In i t ial Fl ight Plan Process i ng Syste m IFR In strument Fl ight Rules IFR B In tern a t ional Freque ncy Regi stra t ion Boa rd I G E S S ta n d a rdized Gra p h ics Exch a nge Fi le I G I A In terage ncy Group on In tern a t ional Avia t ion I G V Inlet Guide Va n e I L M In d e pendent Landi ng Mon i tor I L S In strument Landi ng Syste m . The system provid es la tera l ,a long - c o u r se and vert ical guid a nce to airc raft a t te m p t i ng a la n di ng. I M A In tegra ted Modular Avion ic s I M A S In tegra ted Miss ion Avion ics Syste m 5 0 5 3 I S D O S Inform a t ion System Des ign and Optimiz a t ion Syste m I S H In termedia te Syste m He l lo I S L N Isola t ion I S O ( 1 ) In tern a t ional Orga n iz a t ion for Sta n d a rdiz a t ion ( 2 ) In tern a t ional Sta n d a rds Orga n iz a t ion ( 3 ) Isola t ion I s o-C o n t o u r Refer to con to u r ISO PA ISO Pro toc ol Arch i tect u re I S Q C In ter so und Quality Con trol fac i l i ty. Fac i l i ty th a t ch ecks, la bels and di stri b u tes all vid eo casse t tes. I S P ( 1 ) In tegra ted Swi tch i ng Pa n e l ( 2 ) In ternet Service Provid er I S R In terrupt Service Ro u t i n e I S S N In termedia te System Subnetwor k I S U In i t ial Signal Un i t I TA In st i t u te of Air Tra n s port I T M Inform a t ion Tech n ology Ma n age ment is the gro un d ba sed port ion of an A DMS (See also EDMS ). I TO In di um - Tin Oxid e I T S In tegra ted Test Syste m I T S E In tegra ted Test and Support Envi ronme n t I T T ( 1 ) In ter stage Tu r bine Te m pera t u re ( 2 ) In ter- Tu r bine Te m pera t u re I T U In tern a t ional Te lec om mun ic a t ions Un ion I U P S In ternal Un i n terru p t i ble Power Supply I V Isola t ion Va lve I V S I In sta n ta n eo us Vert ical Speed In dic a tor I T W S In tegra ted Terminal Wea th er Syste m J A A Joint Avia t ion Au th ori ty J A R Joint Ai rworth i n ess Requi re me n t I O C ( 1 ) In i t ial Opera t ional Capa bi l i ty ( 2 ) Inp u t / O u tput Conce n tra tor ( 3 ) Inp u t / O u tput Con trol ler I O N In st i t u te of Naviga t ion I O R In dian Ocean Region I O S In ternet Opera t i ng Syste m I OT & E In i t ial Opera t ional Test and Eva l u a t ion I P ( 1 ) In structor Pilo t ( 2 ) In termedia te Press u re ( 3 ) In ternet Pro toc ol I PAC G Inform a t ional Pac i fic Air Traffic Con trol C oordi n a t i ng Gro u p I P B I l l ustra ted Pa rts Break d own I P C ( 1 ) I l l ustra ted Pa rts Cata log ( 2 ) In tegra ted Process i ng Cabi n e t ( 3 ) In termedia te Press u re Com pressor I P D ( 1 ) In dustrial Products Divi s ion ( 2 ) In tegra ted Product De l ivery I P I In i t ial Pro toc ol Id e n t i fier I P L I l l ustra ted Pa rts List I P R In ternet Pro toc ol Ro u ter I P T In termedia te Press u re Tu r bi n e I R D In tegra ted Rece iver / Dec od er I R E In ternal Roll Extrus ion I R P In tegra ted Refuel Pa n e l I R S ( 1 ) In ert ial Refere nce Syste m ( 2 ) In terface Requi re me n ts Spec i fic a t ion I R U In ert ial Refere nce Un i t I S A ( 1 ) In dustry Sta n d a rd Arch i tect u re ( 2 ) In tern a t ional Sta n d a rd Atm os p h ere I S C In tegra ted Systems Con trol ler I S D N In tegra ted Services Digi tal Ne twor k 5 2 5 5 L 5 C ivil Sa te l l i te Freque nc y LA A S Local Area Augme n ta t ion Syste m L a b L a bora tory LA D G P S Local Area Differe n t ial GPS LA N Local Area Ne twor k L A P B L i nk Access Pro toc ol - Ba la nced L AT L a t i t u d e L- B a n d A ra dio freque ncy band from 390 to 1,550 MHz L C A L ayered Com ponent Arch i tect u re L C C Lea dless Chip Carrier L C D L iquid Crystal Display L C F L i nk Con trol Fie ld L C I Logical Channel Id e n t i fier L C M Logic Con trol Module L C N Local Com mun ic a t ions Ne twor k L C P L ig h t i ng Con trol Pa n e l L C R L i nk Con n ect ion Refusa l L C S T B Low Cost Simula t ion Test bed L D Lower Da ta L D C C Lea d ed Chip Carrier L D G P S Local Area Differe n t ial Glo bal Pos i t ion i ng Sa te l l i te L D O C Long Dista nce Opera t ional Con trol L D U Lamp Driver Un i t L E L i nk Esta bl i s h L E D L ight Emitting Diod e L e g The sect ion of the fl ight be tween two waypoi n ts. L E O Low Earth Orbi t i ng J A R-AW O Joint Ai rworth i n ess Requi re me n ts – All Wea th er O pera t ion s J ATO Jet Ass i sted Takeoff J C D P Joint Conceptual Defi n i t ion Phase J D P Joint Defi n i t ion Phase J F E T J unct ion Fie ld Effect Tra n s i stor J P S Jo u rnal Process i ng Syste m J / S Ja m mer to Signal Ratio J S AT Joint System Acce p ta nce Test J TAG Joint Test Act ion Gro u p J T I D S Joint Tact ical Inform a t ion Distri b u t ion Syste m K B Ki lo - Bytes (th o usand bytes ) K B I T S Ki lo bi ts K b p s Ki lo bi ts per sec on d k b / s Ki lo bi ts Per Sec on d K B U Key boa rd Un i t K e y A h a nd-o pera ted swi tch i ng device or the act of o pera t i ng such a device. K G Ki logra m k H z Ki lo h ertz (1000 cyc les per sec on d ) k m Ki lome ter K P S Ki lo bytes Per Sec on d k t s Kn o ts k VA Ki lovol t - a m pere k W Ki lowa t t L Left L 1 L - Band carrier (1575.42 MHz) L2 L - Band carrier (1227.6 MHz) 5 4 5 7 L o c k-O n The con di t ion that exi sts when the DME rece ives re ply pul ses to at lea st 50 percent of th e i n terroga t ion s. Va l id di sta nce inform a t ion is th e n ava i la ble. LO M Loc a tor Outer Ma r ker. An NDB that is co-loc a ted at the sa me site as the 75 MHz outer marker beac on . LO N Longi t u d e LO P Line Of Pos i t ion LO R A N Long Range Naviga t ion . A system us i ng a gro un d fac i l i ty com posed of a master sta t ion and a slave sta t ion . The airborne rece iver com p u tes the pos i t ion of the airc raft by us i ng two or more rece ived m a ster- s lave pairs of sign a l s. LORA N - A o pera tes at 1850, 1900 and 1950 kHz. LORAN-C opera tes at 100 kHz. LORA N-A was re placed by LORAN-C in 1980. LORAN C Long Range Naviga t ion Syste m LO S ( 1 ) Line Of Sig h t ( 2 ) L i n e - O rie n ted Simula t ion L P L i n ear Pola riz a t ion LP C Low Press u re Com pressor L P D U L i nk Pro toc ol Da ta Un i t LP T Low Press u re Tu r bine LRA or LRRA ( 1 ) Low - R a nge Radio A l t i me ter ( 2 ) Line Re placea ble Asse m bly L R C Long Range Crui se L R M Line Re placea ble Module L R N Long Range Naviga t ion L R R Long Range Radar L R U Line Re placea ble Un i t L S B ( 1 ) Lower Sid e ba n d. The lower sid e band is th e di ffere nce in freque ncy be tween the AM carrier s ignal and the modula t ion sign a l . ( 2 ) Lea st Sign i ficant Bi t L F Low Freque nc y. The freque ncy ra nge from 30 to 300 kHz. L F R Low Freque ncy Radio Range L G A Low Gain An te n n a L H P L ig h tn i ng HIRF P ro tect ion LI B Left Inboa rd L I M L i m i t L I M N AT R A N L i m i ted North Atla n t ic Regional Air Naviga t ion L I N C S Long - Haul In terfac i l i ty Com mun ic a t ions Syste m LI S N Line Im ped a nce Sta bi l iz a t ion Ne twork L L C Logical Link Con trol L L M S L iquid Level Mea s u re ment Syste m L L P Left Lower Pl ug. Id e n t i fies the pl ug on the rea r c on n ector of an avion ics un i t . L/ M L i st of Ma teria l s L M E L i nk Ma n age ment En t i ty L M I Logical Ma n age ment In terface L M M Loc a tor Mid dle Ma r ker. An NDB that is co-loc a ted at the sa me site as the 75 MHz mid dle marker beac on . L M P Left Mid dle Pl ug. Id e n t i fies the pl ug on the rea r c on n ector of an avion ics un i t . L M T Local Mean Ti me L N A Low Noi se Am pl i fier LN AV L a teral Naviga t ion LO Low LO B Left Outboa rd LO C Loc a l izer. The la teral guid a nce port ion of an ILS syste m . 5 6 5 9 M a g n e t i c The di rect ion north as determ i n ed by the ea rth’s N o r t h m agn e t ic fie ld. The refere nce di rect ion for mea s u re ment of magn e t ic di rect ion s. M A I N T Ma i n te n a nce M A L D T Mean Adm i n i stra t ive and Logi st ics De lay Ti me M A P ( 1 ) M i ssed A p proach Poi n t ( 2 ) Mode An nunc ia tor Pa n e l M a r ke r A tra n s m i t ter opera t i ng at 75 MHz that provid es B e a c o n id e n t i fic a t ion of a pa rt icular pos i t ion along an airway or on the approach to an instrument runway. T h e m a r ker beac on is con t i nu o us ly ton e - m odula ted by a 400 - H z , a 1,300-Hz or a 3,000-Hz ton e. Ma r ker beac ons along an instrument runway provide a long - c o u r se (ra nge) guid a nce and des ign a te when an a i rc raft should be at a certain altitude if the airc raft is fol lowi ng the glid e pa th . M / A S I Mach / Ai r s peed In dic a tor M A S P S M i n i mum Avia t ion System Perform a nce Sta n d a rds M AT Ma i n te n a nce Access Term i n a l M AW P M i ssed A p proach ed Waypoi n t M A X Ma xi mum MAX CLB Ma xi mum engine th rust for two - e ngine climb MAX CRZ Ma xi mum engine th rust for two - e ngine crui se M B Ma r ker Beac on M B E Mul t i ple Bit Error M b p s Mega bytes per Sec on d M C Ma ster Change M C A M i n i mum Cross i ng A l t i t u d e M C B M ic rowave Circuit Boa rd M C B F Mean Cyc les Be tween Fa i l u res M C C Ma i n te n a nce Con trol Com p u ter M C D P Ma i n te n a nce Con trol Display Pa n e l L S D Lea st Sign i ficant Digi t L S- D S A D Low - S peed Fra me Re lay Service Access Device L S- F R A D Low - S peed Fra me Re lay Access Device L S I L a rge Sc a le In tegra t ion L S K Line Se lect Key L S N Local Subnetwor k L S P L i nk Sta te PDU LTC Lowest Two - way Channel LT P Left Top Pl ug. Id e n t i fies the pl ug on the rea r c on n ector of an avion ics un i t . Lubber Line A fi xed line placed on an indic a tor to indic a te th e fron t - to - rear axis of the airc raft . LV Lower Sid e band Voice LV D T ( 1 ) L i n ear Va ria ble Differe n t ial Tra n sformer ( 2 ) L i n ear Vol tage Differe n t ial Tra n sducer (used wi th a i rc raft con trol surface servos ). LV L C H G Level Change LV P S Low Vol tage Power Supply LV TO Low Vi s i bi l i ty Take - Off M Mach Num ber m Me ter M A A Ma xi mum Au th orized IFR A l t i t u d e M AC Medi um Access Con trol ler M a c h Mach num ber is the ra t io of the true airspeed to th e N u m b e r s peed of so und at a pa rt icular fl ight con di t ion . It is the ch ief cri terion of airflow pa t tern and is us u a l ly re prese n ted by the free - stream stea dy - sta te va l ue. M a g Magn e t ic M a g n e t i c The bea ri ng wi th res pect to magn e t ic north . B e a r i n g 5 8 6 1 M F M Ma i n te n a nce Fault Me m ory M F S Media Fi le Server M G S C U Main Gear Steeri ng Con trol Un i t M H D Magn e t ic Ha rd Drive M H z Megah ertz (1,000,000 cyc les per sec on d ) M I B Ma n age ment Inform a t ion Ba se MIB II Ma n age ment Inform a t ion Ba se II M I C M ic ro p h on e. A l so refers to the output signal of the mic ro p h on e. M i c r o E A R T S M ic ro En ro u te Au tom a ted Radar Tracki ng Syste m M I D U Mul t i p u rpose In teract ive Display Un i t M I L M i l i ta ry M I L- H D B K- 2 1 7Ge n eral Predict ion of Electron ic Equi pment (MTBF ) M ILS P E C M i l i ta ry Spec i fic a t ion s M I L-S T D- 8 8 2 System Safe ty Requi re me n ts M i n ( 1 ) M i n i mum ( 2 ) M i nu tes M I P S M i l l ion In struct ions Per Sec on d M K R ( 1 ) Ma r ker ( 2 ) Ma r ker Beac on M L A Ma n e uver Limited A l t i t u d e M L S M ic rowave Landi ng Syste m M LW Ma xi mum Landi ng We ig h t M M Ma ss Me m ory M M E Modular Mo un t i ng Enc los u re M M I Ma n - Machine In terface M M I C Mon ol i th ic Mic rowave In tegra ted Circui t M m o The maxi mum Mach num ber at wh ich an airc raft has been cert i fied to opera te. M C D U Mul t i funct ional Con trol Display Un i t M C N Ma nu fact u ri ng Con trol Num ber M C P ( 1 ) Ma i n te n a nce Con trol Panel ( 2 ) Mode Con trol Pa n e l M C T Max Con t i nu o us T h rust M C U ( 1 ) Modular Concept Unit (approxi m a te ly 1/ 8 - AT R, Ai rline Tra n s port Rack ) ( 2 ) Mo tor Con trol Unit (used in au to th ro t tle ) ( 3 ) Mul t i funct ion Concept Un i t M DA M i n i mum Descent A l t i t u d e M D C Ma i n te n a nce Diagn ost ic Com p u ter M D C R S Me teorological Da ta Col lect ion and Re port i ng Service M D L Mul t i p u rpose Da ta Link M D S M i n i mum Discern i ble Sign a l . The MDS is the lowest RF signal level that can be detected as a va l id sign a l . M D T Ma i n te n a nce Display Term i n a l M E A M i n i mum En ro u te A l t i t u d e M E C Main Equi pment Center M E L M i n i mum Equi pment List . The list of equi pment th a t the FA A requi res be aboa rd and wor ki ng on an a i rc raft before flyi ng. M E O Medi um Earth Orbi t M E S Main Engine Sta rt M E T Me teorology M F Medi um Freque nc y. The port ion of the ra dio s pectrum from 300 kHz to 3 MHz. M F C P Mul t i funct ion Con trol Display Pa n e l M F D Mul t i funct ion Display M F D S Mul t i funct ion Display Syste m M F D U Mul t i funct ion Display Un i t M F I T Mean Fault Isola t ion Ti me 6 0 6 3 M P E L Ma xi mum Perm i ss i ble Expos u re Leve l M P U Mul t i funct ion Process Un i t M R A M i n i mum Rece p t ion A l t i t u d e MRDU Mul t ichannel Rece iver / Dec od er Un i t M R O S E Mul t i ple - ta s ki ng Rea l - t i me Opera t i ng Syste m E xecu t ive M R R Ma nu fact u ri ng Revi s ion Request M R T Mean Res pon se Ti me M S M i l l i sec on d m / s Me ter per Sec on d M S A S M i n i stry of Tra n s porta t ion Sa te l l i te Augme n ta t ion Syste m M S B Most Sign i ficant Bi t M S C Message Seque nce Chart M S C P Mo bi le Sa te l l i te Service Provid er M S D ( 1 ) Ma ss Storage Device ( 2 ) Most Sign i ficant Digi t M S G Message M S I Medi um Sc a le In tegra t ion M S K M i n i mum Shift Keyi ng M S L Mean Sea Leve l M -S N D C F Mo bi le - Subnetwork De pendent Converge nce M S P Mode S Spec i fic Pro toc ol M S S R Mon o p ul se Sec on d a ry Surve i l la nce Radar M S S S Mode S Spec i fic Services M S U Mode Se lect Un i t M T M i n i mum Ti me M M R Mul t i - Mode Rece iver M M S Ma i n te n a nce Ma n age ment Syste m M N Magn e t ic North M N C I D Ne twork Ma n age ment Category In teract ion Diagra m M N P S M i n i mum Naviga t ion Perform a nce Spec i fic a t ion M O Magn e to - O p t ic a l M OA ( 1 ) Me m ora n dum of Agree me n t ( 2 ) M i l i ta ry Opera t ion Area M O C A M i n i mum Obstruct ion Clea ra nce A l t i t u d e M O D ( 1 ) Magn e to - O p t ical Drive ( 2 ) Modi fic a t ion ( 3 ) Modula tor Mode A The pul se format for an id e n t i fic a t ion cod e i n terroga t ion of an ATC RBS tra n s pon d er. Mode B An optional mode for tra n s pon d er interroga t ion . Mode C The pul se format for an altitude inform a t ion i n terroga t ion of an ATC RBS tra n s pon d er. Mode D An un a ss ign ed, o p t ional tra n s pon d er mod e. Mode S ( 1 ) Mode Se lect (a tra n s pon d er format to allow di sc re te interroga t ion and data link capa bi l i ty ) ( 2 ) Se lect ive interroga t ion mode of SSR M O D E M Modula tor / De m odula tor M O P R M i n i mum Opera t ional Perform a nce Requi re me n ts M O P S M i n i mum Opera t ional Perform a nce Sta n d a rds M O R A M i n i mum Off - Ro u te A l t i t u d e M O S Me tal Oxide Se m ic on ductor M O S F E T Me tal Oxide Se m ic on ductor Fie ld Effect Tra n s m i t ter M O U Me m ora n dum Of Un d er sta n di ng M P ( 1 ) Main Processor ( 2 ) M id dle Pl ug. Id e n t i fies the pl ug pos i t ion on th e rear con n ector of an avion ics un i t . M P C U Mul t i port Pro toc ol Converter Un i t 6 2 6 5 M T T M A Mean Ti me to Ma i n te n a nce A lert M T T R Mean Ti me To Re pa i r. A perform a nce figu re calcula ted by dividi ng the sum of the act ive re pair ela psed times acc rued in a period on a num ber of des ign a ted items by the num ber of th ese items re pa i red in the sa me period. M T T R S Mean Ti me To Restore Service M T T U R Mean Ti me To Un sch eduled Re m ova l . A perform a nce figu re calcula ted by dividi ng the sum m a t ion of times to un sch eduled re m oval for a sa m ple of re m oved i tems by the num ber of re m oved items in the sa m ple. This is di fferent from MTBUR since no allowa nce is given to items that have not been re m oved. M U ACA RS Ma n age ment Un i t M U LT Mul t i pl ier M U S M i n i mum Use Spec i fic a t ion . A ge n eric desc ri p t ion by pa ra me ter and ch a racteri st ics of the test equi pme n t and reso u rces requi red for test i ng a unit or syste m . M U X Mul t i plexer M WA R A Ma j or World Air Ro u te Area N North N 1 Fan speed N 2 In termedia te com pressor speed N3 H igh speed com pressor N / A Not A p pl ic a ble N AC A Na t ional Advi sory Com m i t tee for Aeron au t ic s N A D I N Na t ional Ai r s pace Da ta In terch a nge Ne twor k N A K Nega t ive Ackn owledge me n t N A S ( 1 ) Na t ional Ai rc raft Sta n d a rd ( 2 ) Na t ional Ai r s pace Syste m N A S A Na t ional Aeron au t ics and Space Adm i n i stra t ion N A S PA L S NAS Prec i s ion A p proach and Landi ng Syste m N AT North Atla n t ic Tracks M T B F Mean Ti me Be tween Fa i l u res. A perform a nce figu re c a lcula ted by dividi ng the to tal unit flyi ng hours ( a i r borne) acc rued in a period of time by the num ber of unit fa i l u res that occu rred du ri ng the sa me time. W h ere to tal unit hours are ava i la ble, this may be used in lieu of to tal unit flyi ng hours. M T B O Mean Ti me Be twee n O u tages M T B R ( 1 ) Mean Ti me Be tween Re m ova l ( 2 ) Mean Ti me Be tween Re pa i r s. A perform a nce figu re calcula ted by dividi ng the to tal unit flyi ng hours acc rued in a period by the num ber of un i t re m ovals (sch eduled pl us un sch eduled) th a t occu rred du ri ng the sa me period. M T B U R ( 1 ) Mean Ti me Be tween Un sch eduled Re m ova l ( 2 ) Mean Ti me Be tween Unit Re place me n ts. A perform a nce figu re calcula ted by dividi ng th e to tal unit flyi ng hours (airborne) acc rued in a period by the num ber of un sch eduled un i t re m ovals that occu rred du ri ng the sa me period. M TC Ma i n te n a nce Terminal Cabi n e t M T D Ma i n te n a nce Terminal Display M T F Ma i n te n a nce Terminal Funct ion M T I Movi ng Ta rget In dic a tor. This type of radar di s play will show only movi ng ta rge ts. M T M Module Test and Ma i n te n a nce M T M I U Module Test and Ma i n te n a nce Bus In terface Un i t M T S AT Mul t i funct ion Tra n s port Sa te l l i te System (Ja pa n ) M T T DA Mean Ti me To Dispa tch A lert M T T F Mean Ti me To Fa i l u re. A perform a nce figu re c a lcula ted by dividi ng the sum m a t ion of times to fa i l u re for a sa m ple of fa i led items by the num ber of fa i led items in the sa m ple. The sa me item fa i l i ng N t i mes con st i t u tes N fa i led items in the sa m ple. This is di fferent from mean time be tween fa i l u res since no a l lowa nce is given to items that have not fa i led. M T T M Mean Ti me To Ma i n te n a nce. The ari thme t ic mean of the time intervals be tween mainte n a nce act ion s. 6 4 6 7 N E G Nega t ive N E M A Na t ional Electrical Ma nu fact u rers Assoc ia t ion N E S D I S Na t ional Envi ronme n tal Sa te l l i te, Da ta and Inform a t ion Service N E T Ne twork En t i ty Ti tle N E XC O M Next Ge n era t ion Com mun ic a t ion s N E X R A D Next Ge n era t ion Radar N F F No Faul ts Fo un d N G AT M New Ge n era t ion Air Traffic Ma n ager N H H igh Press u re Gas Ge n era tor RPM N H E No tes and He l ps Edi tor N I C E NAT Im ple me n ta t ion Ma n age ment Gro u p C ost Effect ive n ess N I M S NAS Infra struct u re Ma n age ment Syste m N I P Ne twork In terface Processor N I R Ne twork In terface Ro u ter N I R V Ne twork interface Ro u ter V DL N I S No t - In - Service N I S T Na t ional In st i t u te of Sta n d a rds and Tech n ology N - L a y e r N is set for any layer name (such as link, n e twor k, e tc.) or for the initial (e. g. N - SDU means LSDU at the link layer ). OSI model defi n i t ion . N L Low - P ress u re Gas Ge n era tor RPM N L M Ne twor k - Loa d a ble Module N L P Ne twor k L ayer Pro toc ol N L R Ne th erla n ds Na t ional Aeros pace Labora tory NLT Not Less T h a n NM or NMI Nau t ical Mile N M Ne twor k Ma n age me n t N ATA Na t ional Air Tra n s port Assoc ia t ion , Inc. N ATC A Na t ional Air Traffic Con trol lers Assoc ia t ion N AT S North Atla n t ic Track Syste m N AT / N A M / PACNorth Atla n t ic / North Americ a n / Pac i fic N AV Naviga t ion N AVA I D Naviga t ional Aid N a v i g a t i o n A medi um holdi ng the custom ized naviga t ion D a t a c a r d d a ta ba se. N AV S TA R The NAVSTAR glo bal pos i t ion i ng system (GPS) is a system us i ng 24 sa te l l i tes, all re port i ng prec i se time s ign a l s, a long wi th loc a t ion keys. Eight sa te l l i tes are in each of th ree 63 - d egree inc l i n ed plane circular or bi ts at 11,000 nmi in altitude. The system is used for n aviga t ion and determ i n i ng exact pos i t ion . Nautical Mile E quiva lent to 6,076.1 fee t , or approxi m a te ly 1.15 ( n m i ) sta t u te miles. N B A A Na t ional Bus i n ess Avia t ion Assoc ia t ion N C N umerical Con trol N I C New In sta l la t ion Conce p t N C D No Com p u ted Da ta N C I Not Curre n tly Im ple me n ted N C S Ne twork Coordi n a t ion Sta t ion N D Naviga t ion Display. An EFIS prese n ta t ion subst i t u t i ng for the horizon tal situation indic a tor (HSI ). N D B ( 1 ) Naviga t ion Da ta Ba se (as stored in FMC me m ory ) ( 2 ) Non - D i rect ional Radio Beac on . A gro und sta t ion d es ign ed spec i fic a l ly for A DF use that opera tes in the 190 - to - 550-kHz ra nge.Tra n s m i ts a con t i nu o us c a rrier wi th eith er 400 - or-1020 Hz modula t ion ( keyed) to provide id e n t i fic a t ion. N D I Non d eve lo pme n tal Ite m N E Ne twork Ele me n t N E A N North Euro pean A DS-B Ne twor k 6 6 6 9 N S Ne twork Service N S A P Ne twork Service Access Poi n t N S D U Ne twork Service Da ta Un i t N S E U Ne u tron Sing le Event Upse t N S S L Na t ional Severe Storms Labora tory N T F No Tro u ble Fo un d. ( Referri ng to test i ng or ch eckout of un i t / m odule.) N T I A Na t ional Te lec om mun ic a t ions and Inform a t ion Adm i n i stra t ion (U. S.) N T S B Na t ional Tra n s porta t ion Safe ty Boa rd N U I Ne twork User Id e n t i fic a t ion N V M Non -Vola t i le Me m ory N V R A M Non -Vola t i le RA M N W S Na t ional Wea th er Service. The NWS provid es a gro un d - ba sed wea th er radar network th ro ughout th e Un i ted Sta tes. The radar network opera tes c on t i nu o us ly and tra n s m i ts the data to the Na t ion a l Me teorological Center, wh ere it corre la tes wi th oth er wea th er observa t ion s. OAC Ocea n ic Area Con trol Center OAG Offic ial Ai rline Guid e OA S Ocea n ic Au tom a t ion Syste m OAT ( 1 ) O pera t ional Acce p ta nce Test ( 2 ) O p t ional Auxi l ia ry Term i n a l . The OAT m ay be in the form of a CRT / Key boa rd device capa ble of i n terfac i ng wi th oth er so u rces of data on th e a i rc raft and supplyi ng data to a hard copy pri n ter. ( Used in an ACA RS syste m .) ( 3 ) O u ts ide Air Te m pera t u re. The unc orrected rea di ng of the outs ide te m pera t u re gauge. D i fferent types of gauges requi re di fferent c orrect ion factors to obtain sta t ic air te m pera t u re. OAT S O r bit and Attitude Tracki ng O B P O pera t ional Bui ld Pla n N M C Na t ional Me teorological Center N M C C D Ne twork Ma n age ment Category Cla ss Diagra m N M C D Ne twork manage ment Category Diagra m N M F Ne twork Ma n age ment Funct ion N M I R S Ne twork Ma n age ment In terface Requi re me n ts S pec i fic a t ion N M O S N - type Me tal Oxide Se m ic on ductor N M P Ne twork Ma n age ment Pla n N M S Ne twor k Ma n age ment Syste m N M T Not More T h a n N OA A Na t ional Ocea n ic and Atm os p h eric Adm i n i stra t ion N O C No t ice Of Change N O C A R North Atla n t ic Ocea n ic Concept and Requi re me n ts N O C C Na t ional Opera t ions Con trol Center NO COM No Com mun ic a t ion . A NO COM annunc ia t ion i n dic a tes that a downl i nk message has not bee n ackn owledged in an ACA RS syste m . N O I No t ice of In qui ry N o i s e Un d es i red ra n d om electrom agn e t ic di st u r ba nces or s p u rio us signals that are not pa rt of the tra n s m i t ted or rece ived sign a l . N O PAC North Pac i fic N OTA M No t ice to Ai rme n N OT U S No t ice to Users (ARINC ) N PA Non - P rec i s ion A p proach N P D U Ne twork Pro toc ol Da ta Un i t N R Ne twor k Ro u ter N R D Ne twork Ro u t i ng Dom a i n N R P Na t ional Ro u te Progra m N R Z Non - Re t u rn to Zero 6 8 7 1 O M E G A A n aviga t ion system that uses two hig h - powered tra n s m i t ter gro und sta t ions to broa d c a st a con t i nu o us wave sign a l . The rece iver mea s u res the ra nge di ffere nce be tween the two sta t ions to determ i n e pos i t ion . O m n i b e a r i n gThe bearing indicated by a navigational receiver on transmissions from an omnidirectional radio range (VOR). O M S ( 1 ) O nboa rd Ma i n te n a nce Syste m ( 2 ) O rd er Ma n age ment Syste m O M T Object Mod e l i ng Tech n ique O OA Object Orie n ted An a lys i s O O D Object Orie n ted Des ign O O O I OUT - OFF- ON - IN. An OOOI event is rec ord ed as pa rt of the ACA RS opera t ion . The OUT event is rec ord ed when the airc raft is clear of the ga te and rea dy to ta xi . The OFF event occurs when the airc raft has lifted off the runway. The ON event occurs when the airc raft has la n d ed. The IN event occurs when the airc raft has ta xied to the ramp area . O n - B l o c kT i m e The time that the airc raft arrives at the ga te. O P O pera t ion a l O P T O p t i mum O PA S O verh ead Panel A R INC 629 Syste m O P B C O verh ead Panel Bus Con trol ler O P E R O pera t ion O P R O nce Per Revol u t ion O P S O pera t ions Per Sec on d O P S P E C S O pera t ional Spec i fic a t ion s O P U O ver s peed Pro tect ion Un i t O-Q A R O p t ical Quick Access Rec ord er O R O pera t ional Requi re me n ts O S O pera t i ng Syste m O B S ( 1 ) O m n i bea ri ng Se lector. A panel instrument that c on tains the con trols and circui ts to se lect an om n i bea ri ng and determine the TO - F ROM i n dic a t ion . ( 2 ) O p t ical Bypa ss Swi tch O C A Ocea n ic Con trol Area O C C O pera t ions Con trol Center O C D Ocea n ic Clea ra nce De l ivery O C I G Ocea n ic Com mun ic a t ions Im prove ment Gro u p O C P Ocea n ic Clea ra nce Processor O c t a l Ba se-8 coun t i ng syste m . N um bers include 0, 1, 2, 3, 4, 5, 6, 7. O DA P S Ocea n ic Display And Pla n n i ng Syste m . Will prese n t ocea n ic fl ight data to con trol lers in a di s play that wi l l e n a ble be t ter ro u te and altitude ass ignme n ts. O D I D O pera t ional Display and Input Deve lo pme n t O D L O p t ical Da ta Link O E M O riginal Equi pment Ma nu fact u rer O E U O verh ead Electron ics Un i ts O f f - B l o c k T i m e The time that the airc raft leaves the ga te. O F P O pera t ional Fl ight Progra m O G E O pera t ional Gro und Equi pme n t O H U O verh ead Unit (HUD) O I D O u tline In sta l la t ion Drawi ng O I U O rie n ta t ion / In troduct ion Un i t O L A N O nboa rd Local Area Ne twor k O L D I On-Line Da ta In terch a nge O & M O pera t i ng and Ma i n te n a nce O M O u ter Ma r ker O M D O nboa rd Ma i n te n a nce Docume n ta t ion 7 0 7 3 PA N S-O P S P rocedu res for Air Naviga t ion Services - Ai rc raft O pera t ion s PA P I P rec i s ion A p proach Pa th In dic a tor s PA R P rec i s ion A p proach Radar. An X-band radar that scans a limited area and is pa rt of the gro un d - c on trol led approach syste m . PA S Pa sse nger Ad dress Syste m PAT P i lot A p pl ic a t ions Term i n a l PAU Pa sse nger Ad dress Un i t PAW E S Perform a nce Assess ment and Wor kload Eva l u a t ion PA X Pa sse nger P B D Place Bea ri ng / D i sta nce (waypoi n t ) P B I D Post Burn - In Da ta P B X P riva te Bra nch Exch a nge P C ( 1 ) Per sonal Com p u ter ( 2 ) P ri n ted Circui t P-C o d e The GPS prec i s ion cod e P C A P hys ical Configu ra t ion Au di t P C B P ri n ted Circuit Boa rd P C C P i lot Con trol ler Com mun ic a t ion PCI P ro toc ol Con trol Inform a t ion . The N-PCI is exch a nged be tween peer network me m bers ( OSI Model) to coordi n a te joint inform a t ion . PCIP P rec i pi ta t ion P C M P ul se Code Modula t ion P C M C I A Per sonal Com p u ter Me m ory Card In terface Assoc ia t ion P C U ( 1 ) Pa sse nger Con trol Un i t ( 2 ) Power Con trol Un i t P D P rofi le Desce n t P DA P re m a t u re Descent A lert O S C O rd er Sta t us Re port O S D S Ocea n ic System Deve lo pment Support O S I ( 1 ) O pen Systems In terc on n ect ion ( 2 ) O pen System In terface O S I E OSI Envi ronme n t O S I - R M O pen Systems In terc on n ect ion Refere nce Mod e l O S P F O pen Shortest Pa th Fi r st OT & E O pera t ional Test and Eva l u a t ion OTA Office of Tech n ology Assess ment (U. S.) OT F P O pera t ional Traffic Flow Pla n n i ng OT H O ver The Horizon OT P Office of Te lec om mun ic a t ions Pol icy (U. S.) OT S Off - T h e - S h e l f OV R D O verrid e OV S O verh ead Vid eo Syste m ox y Oxyge n PA ( 1 ) Pa sse nger Ad dress ( 2 ) Power Am pl i fier PAC Pa th At te nu a t ion Com pe n sa t ion PA / C I Pa sse nger Ad dress / C a bin In terp h on e PAC I S Pa sse nger Ad dress and Com mun ic a t ion In terp h on e Syste m PA D Packet Asse m bler- D i sa sse m bler Pa i r e d DME channels are pa i red wi th a VORTAC or ILS C h a n n e l s freque ncy and are au tom a t ic a l ly se lected when th e VORTAC or ILS freque ncy is se lected. Most naviga t ion c on trols have this fea t u re. PA L P rogra m m a ble Array Logic PA M P ul se Am plitude Modula t ion 7 2 7 5 P E T Pac i fic Engi n eeri ng Tria l s P E TA L P re l i m i n a ry Euroc on trol Test of Ai r / G ro und Da ta Link P E TAL II P re l i m i n a ry Euroc on trol Test of Ai r / G ro und Da ta L i nk, P h a se II P E TAL IIe P re l i m i n a ry Euroc on trol Test of Ai r / G ro und Da ta L i nk, P h a se II E xte n s ion P F ( 1 ) P i lot Flyi ng ( 2 ) Power Factor P F C P ri m a ry Fl ight Com p u ter P F C S P ri m a ry Fl ight Con trol Syste m P F D ( 1 ) P ri m a ry Fl ight Director ( 2 ) P ri m a ry Fl ight Display. An EFIS prese n ta t ion s u bst i t u t i ng for the A DI. P F I S Pa sse nger Fl ight Inform a t ion Syste m P F R P ul se Re pe t i t ion Freque nc y. The ra te at wh ich pul ses a re tra n s m i t ted. P F S P roduct Fi le Se ts P G A Pin Grid Array P H A R E P rogram for Ha rm on ized ATC Resea rch in Euro pe P H I B U F Perform a nce Buffet Limit P H I N O M Nominal Ba nk Ang le P H Y P hys ical In terface Device Phase A s ignal in wh ich the phase va ries (wi th res pect to th e M o d u l a t i o n original signal) wi th the amplitude of the modula tory s ign a l , wh i le the amplitude of the carrier wave remains con sta n t . S i m i lar to a modi fied freque nc y m odula ted sign a l . P I Pa ra me ter Id e n t i fier P I A Perform a nce In tegri ty and Ava i la bi l i ty P I C S P ro toc ol Im ple me n ta t ion Conform a nce Sta te me n ts P D B Perform a nce Da ta Ba se P D C P re - De pa rt u re Clea ra nce P D C U Panel Da ta Conce n tra tor Un i t P D D Pack age Des ign Docume n t P D D I P roduct Defi n i t ion Da ta In terface. S ta n d a rdizes digi ta l d esc ri p t ions of pa rt configu ra t ions and pro pert ies n eed ed for manu fact u ri ng. P D F P ri m a ry Display Funct ion P D L P rogram Des ign Langu age P- D M E P rec i s ion Dista nce Mea s u ri ng Equi pme n t P D N P u bl ic Da ta Ne twork (CC ITT / ISD ) P D O P Pos i t ion Dilution Of Prec i s ion . A G PS term for error i n troduced into the GPS calcula t ion s. P D O S Powered Door Ope n i ng Syste m P D R P re l i m i n a ry Des ign Review P D S P ri m a ry Display Syste m P D U ( 1 ) Power Distri b u t ion Un i t ( 2 ) Power Drive Un i t ( 3 ) P ro toc ol Da ta Un i t . The N-PDU is a com bi n a t ion of the N-PCI and the N-UD or N-SDU. The N - PDU is the to tal inform a t ion that is tra n sferred be tween peer network me m bers (OSI Model) as a un i t . P E C T Peer En t i ty Con tact Ta ble P E P Peak Enve lo pe Power P E R F Perform a nce Performance A re la t ive num ber used to com pa re the perform a nce I n d ex of di fferent radar syste m s. It is calcula ted from tra n s m i t ter peak power, a n tenna ga i n , p ul se width , prf, a n tenna beam width and the rece iver noi se figu re. P E R T P rogram Eva l u a t ion Review Tech i n que P E S Pa sse nger En terta i nment Syste m 7 4 7 7 P N F P i lot Not Flyi ng P N R Point of No Re t u rn P OA Plain Old ACA RS P O C P roof Of Conce p t Polled Mode An ACA RS mode of opera t ion in wh ich the airborn e system tra n s m i ts only in res pon se to rece ived upl i nk messages (pol l s ). P O P Point of Prese nce P O R Pac i fic Ocean Region P O S Pos i t ion POS INIT Pos i t ion In i t ia l iz a t ion POS REF Pos i t ion Refere nce P OT Po te n t iome ter P OT S Plain Old Te le p h one Syste m / Service P P D U P hys ical Layer Pro toc ol Da ta Un i t P P I Pla n n ed Pos i t ion In dic a tor. A type of radar di s play wh ich shows airc raft pos i t ions and airways ch a rt on the sa me di s play. P P L P rocessor- to - P rocessor Link p p m pages per minu te P P M ( 1 ) P ul se Pos i t ion Modula t ion ( 2 ) Pa rts Per Million P P O S P resent Pos i t ion P P P Poi n t - to - Point Pro toc ol P P S ( 1 ) Packe ts Per Sec on d ( 2 ) P rec i se Pos i t ion i ng Service ( 3 ) P ul se Per Sec on d P R A I M P redict ive Rece iver Au ton om o us In tegri ty Mon i tori ng P R A M P rerec ord ed An n o unce ment Mach i n e P R E L I M P re l i m i n a ry Da ta P I D ( 1 ) Pa ra me ter Id e n t i fier ( 2 ) P ri m i t ive Id e n t i fier ( 3 ) P rocess Id e n t i fier P I / O P rocessor Inp u t / O u tp u t P I R E P roduct ion or Pipe In ternal Roll Extrus ion P I R E P S P i lot Re ports Pitot Pressure The sum of the sta t ic and dyn a m ic press u res and is the to tal force per unit area exerted by the air on th e s u rface of a body in motion . Pitot Tu b e A forwa rd fac i ng pro be attach ed to the outs ide of th e a i rc raft to se n se the re la t ive press u re of the airc raft m ovi ng th ro ugh the atm os p h ere. Na med for He n ri P i tot who fi r st used this me th od of mea s u ri ng fl uid flow press u re. P L Pa ra me ter Le ng th PLA ( 1 ) Power Level Ang le ( 2 ) P rogra m m a ble Logic Array P L G R P rec i s ion Lig h twe ight GPS Rece iver P L L P h a se Locked Loo p P M P h a se Modula t ion P M A ( 1 ) Pa rts Ma nu fact u ri ng A p prova l ( 2 ) Permanent Magnet A l tern a tor P M AT Porta ble Ma i n te n a nce Access Term i n a l P M C P rovi s ional Me m ory Cover P M G Permanent Magnet Ge n era tor P M O S P - Type Me tal Oxide Se m ic on ductor P M S Perform a nce Ma n age ment Syste m P N ( 1 ) Pa rt Num ber ( 2 ) Pseudo Noi se P N C S Perform a nce Naviga t ion Com p u ter Syste m P N D P ri m a ry Naviga t ion Display P N E U P n e um a t ic 7 6 7 9 P S E U P roxi m i ty Se n sor Electron ic Un i t P S L / P S A P ro blem Sta te ment Langu age / P ro blem Sta te me n t An a lyzer P S M Power Supply Modules P S N Packet Swi tch i ng Ne twor k P S P L P referred Sta n d a rd Pa rts List P S R P ri m a ry Surve i l la nce Radar. The pa rt of the ATC system that determ i n es the ra nge and azi mu th of an a i rc raft in a con trol led air space. P S S P roxi m i ty Se n sor Syste m P S U Pa sse nger Service Un i t P T To tal Press u re P T D Perform a nce Test Dom a i n P S E Packet Swi tch i ng Exch a nge P S T N P u bl ic Swi tch ed Te le p h one Ne twor k P T H Pa th P T I Packet Type Id e n t i fier P T M Peri p h eral Tra n s i t ion Module (I/O interface for SBC ) P T R P roduct ion Test Requi re me n ts P T S P ro blem Tracki ng Syste m P T S D P roduct ion Test Spec i fic a t ion Docume n t P T T ( 1 ) Post , Te le p h one and Te legra p h ( 2 ) P ush To Ta l k. A l so refers to the swi tch i ng sign a l that enables the tra n s m i t ter. ( 3 ) P ush To Test P T U Power Tra n sfer Un i t P V D Plan View Display P V Pa ra me ter Va l ue P V C Permanent Vi rtual Circui t P V T Pos i t ion , Ve loc i ty, Ti me P R E S S P ress u re P r e s s u r e The altitude mea s u red above sta n d a rd press u re leve l . A l t i t u d e Ba sed on the re la t ionship of press u re and altitude wi th res pect to a sta n d a rd atm os p h ere. P R E V P revio us P r e v e n t i v e A resol u t ion advi sory that instructs the pi lot to avoid A d v i s o r y certain devia t ions from cu rrent vert ical ra te. ( TCA S ) P R F P ul se Re pe t i t ion Freque ncy P R I ( 1 ) P ri m a ry ( 2 ) P ri m a ry Rate In terface P R M ( 1 ) P rec i s ion Runway Mon i tori ng ( 2 ) P ro posed Rule Maki ng P R N Pseudo Random Noi se P R O C P rocedu re P R O F P rofi le P R O G P rogress Page on MC DU P R O M P rogra m m a ble ROM P R- N AV P rec i s ion Area Naviga t ion P r o t o c o l A set of rules for the format and con tent of messages be tween com mun ic a t i ng processes. P R OV P rovi s ion a l P R OX P roxi m i ty P R S OV P ress u re Regula t i ng and Shutoff Va lve P / R S T P ress To Rese t P R T R P ri n ter P S Power Supply P S A Power Supply Asse m bly P S A S P ri m a ry Sta bi l i ty Augme n ta t ion Syste m P S D Port Shari ng Device P S D N Packet Swi tch ed Da ta Ne twor k 7 8 8 1 R A A Regional Ai rline Assoc ia t ion Rabbit Tr a c k s R a b bit Tracks, or run n i ng ra b bi ts, refer to th e di st i nct ive di s play produced by anoth er (alien ra d a r ) radar system tra n s m i ss ion . R A D ( 1 ) R a dia l ( 2 ) R a dio ( 3 ) R a pid A p pl ic a t ion Deve lo pme n t R a d a r R a dio De tect i ng and Rangi ng. A system that mea s u res di sta nce and bea ri ng to an object . Radar Mile The time interval (approxi m a te ly 12.359 mic rosec on ds ) requi red for ra dio waves to travel one nau t ical mile and re t u rn (to tal of 2 nm i ). R a d i a l A line of di rect ion goi ng out from a VOR sta t ion mea s u red as a bea ri ng wi th res pect to magn e t ic n orth . R a d o m e The ra d ome is the pro tect ive cover on the airc raft n ose that fi ts over the wea th er radar system ante n n a . The ra d ome is tra n s pa rent at radar freque nc ies. R A F Requi re me n ts An a lysis Fold er R A I R a dio A l t i me ter In dic a tor R A I M Rece iver Au ton om o us In tegri ty Mon i tori ng R A LT R a dio A l t i me ter (also RA , RA DA LT, LRA , LR RA ) R A M R a n d om Access Me m ory. Ge n era l ly used to desc ri be rea d / wri te integra ted circuit me m ory. R A P P S Re m o te Area Prec i s ion Pos i t ion i ng Syste m R A S Row Ad dress Stro be R AT RAM Air Te m pera t u re is the te m pera t u re of the air e n teri ng an air sc oop inle t . It is a factor in engi n e perform a nce. R / C R a te of Climb R-C Res i stor- C a pac i tor networ k R-C & W R ack Con n ectors and Wi ri ng R C AG Re m o te Center Ai r / G ro und Sta t ion P W M P ul se -Width Modula t ion P W R Power Q A R Q uick Access Rec ord er Q C Q u a l i ty Con trol Q E C Q u a dra n tral Error Corrector Q F E A me th od of se t t i ng the altime ter to com pe n sa te for ch a nges in ba rome tric press u re and runway eleva t ion . P i lot rece ives inform a t ion from airfie ld and adjusts his a l t i me ter acc ordi ng ly and it will read zero altitude at to uch d own on the runway. Q M Q u a l i ty Ma n age me n t Q M P Q u a l i ty Ma n age ment Pla n Q N E The me th od of se t t i ng the altime ter to the sta n d a rd a tm os p h ere datum -29.92 inch es of mercu ry ( 1,013.25 m b ). This se t t i ng is used in the Un i ted Sta tes a i r s pace by all airc raft above FL 180. Q N H The more com m on me th od of se t t i ng the altime ter to c om pe n sa te for ch a nges in ba rome tric press u re. P i lo t rece ives inform a t ion from airfie ld, a d j usts his a l t i me ter acc ordi ng ly and the altime ter will rea d a i rfie ld eleva t ion at to uch d own . Q O P Q u a l i ty Opera t i ng Procedu res Q o S Q u a l i ty of Service Q R H Q uick Refere nce Ha n dboo k Q T Y Q u a n t i ty Q UA D Q u a dra n t Quadrantral E rror in the re la t ive bea ri ng caused by the di stort ion E r r o r of the rece ived ra dio signal (RF fie lds) by th e struct u re of the airc raft . R ( 1 ) Rig h t ( 2 ) Ro u te Tun ed NAVAID R A ( 1 ) Resol u t ion Advi sory (ge n era ted by TCA S ) ( 2 ) R a dio A l t i me ter ( 3 ) Ro u t i ng Area 8 0 8 3 R E L Re la t ive R E Q ( 1 ) Request ( 2 ) Requi red / Requi re me n t R E R Res idual Error Rate Resolution A di s play indic a t ion given to the pi lot rec om me n di ng A d v i s o r y a maneuver to inc rea se vert ical se pa ra t ion re la t ive to an intru di ng airc raft . A resol u t ion advi sory is also c la ss i fied as correct ive or preve n t ive. R E S T R Restrict ion R E S Y N C I N G Resynch ron izi ng R E T ( 1 ) R a pid Exit Ta xi way ( 2 ) Re l ia bi l i ty Eva l u a t ion Test R E U Re m o te Electron ics Un i t R F R a dio Freque nc y. A ge n eral term for the ra nge of freque nc ies above 150 kHz, to the infra - red region ( 1012 Hz). R F C Request for Com me n ts R F I ( 1 ) R a dio Freque ncy In terfere nce ( 2 ) Request For Inform a t ion R F P Request For Pro posa l R F T P Request For Tech n ical Pro posa l R F U R a dio Freque ncy Un i t R G B Red / G ree n / Bl ue R G C S P Review of the Ge n eral Concept of Se pa ra t ion Pa n e l R H R a dio Ha n dler R H O Res pon se on Ha n d off R H S M Reduced Horizon tal Se pa ra t ion M i n i m a R I B ( 1 ) Right Inboa rd ( 2 ) Ro u t i ng Inform a t ion Ba se R I P Ro u t i ng Inform a t ion Pro toc ol R I S C Reduced In struct ion Set Com p u ter R I U R a dio In terface Un i t R C C Re m o te Charge Converter R C E R a dio Con trol Equi pme n t R C L R a dio Com mun ic a t ions Link R C O Re m o te Com mun ic a t ions Outle t R C P ( 1 ) R a dio Con trol Pa n e l ( 2 ) Requi red Com mun ic a t ions Perform a nce R C R Ro u t i ng and Circuit Restora l R C V R Rece iver R C U Re m o te Con trol Un i t R & D Resea rch and Deve lo pme n t R d R-Channel used for data R DA R A Regional Domest ic Air Ro u te Area R D C Ro u t i ng Domain Confed era t ion R D F Ro u t i ng Domain Form a t R D I Ro u t i ng Domain Id e n t i fier R D M I R a dio Dista nce Magn e t ic In dic a tor R D P Radar Da ta Process i ng (syste m ) R D R R a d a r R D S S R a dio De term i n a t ion Sa te l l i te Service R D U Rece iver / Dec od er Un i t R DV Requi re me n ts Deve lo pment and Va l id a t ion R DV S R a pid De ployment Voice Swi tch R E C A P Re l ia bi l i ty Eva l u a t ion and Correct ive Act ion Progra m R E F Refere nce R E F L Reflect ion Re f l e c t i v i t y This is a mea s u re ment of the abi l i ty of a ta rget to Factor (Z) reflect the energy from a radar bea m . Re l a t i v e The bea ri ng of a gro und sta t ion re la t ive to th e B e a r i n g di rect ion the airc raft nose poi n ts, or the di rect ion of an airc raft to or from an NDB. 8 2 8 5 RJ Regional Je t R L E Res pon se on Link Esta bl i s hme n t R L P Ri ng Laser Gyro R L S ( 1 ) Re l ia ble Link So u rce ( 2 ) Re m o te Light Se n sor R LY Re lay R & M Re l ia bi l i ty and Ma i n ta i n a bi l i ty R M & A Re l ia bi l i ty Ma i n ta i n a bi l i ty and Ava i la bi l i ty R M I R a dio Magn e t ic In dic a tor R M M S RM Ma n age ment Syste m R M P ( 1 ) R a dio Ma n age ment Pa n e l ( 2 ) Re m o te Ma i n te n a nce Pa n e l R- N AV Area Naviga t ion R N G R a nge R N G A R a nge Arc R N P Requi red Naviga t ion Perform a nce R N R Rece ive Not Rea dy R N T P R a dio Nav Tun i ng Pa n e l R O ( 1 ) R a dio O pera tor ( 2 ) Roll Out R OA Rec ogn ized Opera t i ng Age nc y R O B Right Outboa rd R O C ( 1 ) R a te Of Climb ( 2 ) R a te of Opera t ional Capa bi l i ty R O D R a te Of Desce n t R O M ( 1 ) Read Only Me m ory ( 2 ) Ro ugh Ord er of Magn i t u d e R O N Remain Over Nig h t R OT H R Re loc a ta ble Over- T h e - Horizon Radar R P Ro u t i ng Pro toc ol 8 4 R P I R a pid Process Im prove me n t R P M Revol u t ions Per Minu te R P OA Rec ogn ized Priva te Opera t ion Age ncy (CC ITT ) R R Rece iver Rea dy R R I Ro u ter Refere nce Im ple me n ta t ion R S D P Re l ia ble Seque nc i ng De l ivery Confi rm a t ion Pro toc ol R S N Regional Subnetwor k R S P ( 1 ) Requi red Surve i l la nce Perform a nce ( 2 ) Rever s ion Se lect Pa n e l R S S I Rece ived Signal Stre ng th In dic a tor R T ( 1 ) R a dio Te lec om mun ic a t ion ( 2 ) Rece iver- Tra n s m i t ter (R/T). A l so referred to as a tra n sce iver. ( See T / R ) R TA ( 1 ) Rece iver- Tra n s m i t ter An te n n a ( 2 ) Requi red Ti me of Arriva l R TC Rea l - Ti me Clock R TC A R a dio Tech n ical Com m i ss ion for Aeron au t ic s R TCA DO- 1 6 0 RTCA Document 160, Envi ronme n tal Con di t ions and Test Procedu res for Ai r borne Equi pme n t , Iss ued 12 / 04 / 89 R TCA DO- 1 7 8 RTCA Document 178, Softwa re Con s id era t ions in Ai r borne Systems and Equi pment Cert i fic a t ion , i ss ued 03 / 22 / 85 R T E Ro u te R T F R a dio te le p h ony R T I Rea l - Ti me In terroga te R T M R a dio Tra n s m i ss ion Module R T P Re l ia bi l i ty Test Pla n R TO Re jected Takeoff R TO S Rea l - Ti me Opera t i ng Syste m R T P R a dio Tun i ng Pa n e l 8 7 8 6 R T R Re m o te Tra n s m i t ter Rece iver Site R T S Request To Se n d R T T I R un - Ti me Type Id e n t i fic a t ion R T U R a dio Tun i ng Un i t R U R ack Un i t R u n w a y The act of inadverte n tly cross i ng the runway holdi ng I n c u r s i o n point wi thout ATC clea ra nce. R V D T Ro ta ry Vol tage Differe n t ial Tra n sducer R V R R unway Visual Range R V S M Reduced Vert ical Se pa ra t ion Minimum R / W Rea d / Wri te R W R unway R W M Rea d -Wri te Me m ory. A me m ory in wh ich each cell is se lected by applyi ng appro pria te electrical inp u t s ign a l s, and the stored data may be eith er se n sed at the appro pria te output terminal or ch a nges in res pon se to oth er electrical input sign a l s. R x Rece iver R Z Re t u rn to Zero S So u th S 0 Segment O S 1 Segment 1 S A ( 1 ) Se lect ive Ava i la bi l i ty ( 2 ) S i t u a t ion Awa re n ess S A A Service Access Area S A A R U Sec on d a ry Attitude Air Da ta Refere nce Un i t S A E Soc ie ty of Au tom o t ive Engi n eer s S A I System Arch i tect u re and In terface S A M A Small Ai rc raft Ma nu fact u rers Assoc ia t ion S A P Service Access Poi n ts S A R Sea rch and Rescue S A R P S S ta n d a rds And Rec om me n d ed Pract ices S A S ( 1 ) S ta bi l i ty Augme n ta t ion Syste m ( 2 ) S ta t ion Ad dress Se t S AT ( 1 ) S ta t ic Air Te m pera t u re is the to tal air te m pera t u re c orrected for the Mach effect . Inc rea ses in a i r s peed cause pro be te m pera t u re to ri se prese n t i ng erron eo us inform a t ion . SAT is th e o u ts ide air te m pera t u re if the airc raft could be bro ught to a stop before mea s u ri ng te m pera t u res. ( 2 ) System Acce p ta nce Test S ATC O M Sa te l l i te Com mun ic a t ion s S AT N AV Sa te l l i te Naviga t ion S B Service Bul le t i n S B C S i ng le Boa rd Com p u ter S B D Sch e m a t ic Block Diagra m S B E S i ng le Bit Error S / C S tep Climb S C S pec ial Com m i t tee SCAT S pec ial Category S C D ( 1 ) S pec i fic a t ion Con trol Drawi ng ( 2 ) System Category Diagra m S C D U Sa te l l i te Con trol Da ta Un i t SCI D Softwa re Configu ra t ion In d ex Drawi ng SCI U R a dio A l t i me ter In dic a tor S C M Softwa re Configu ra t ion Ma n age ment SCP C S i ng le Carrier Per Channel SCS S i ng le Channel Simplex . A c om mun ic a t ion system th a t uses simplex . S C S I Small Com p u ter System In terface S C U ( 1 ) S ignal Con di t ion i ng Un i t ( 2 ) S ignal Conver s ion Un i t 8 9 S E U ( 1 ) S i ng le Event Upse t ( 2 ) Seat Electron ics Un i t S F D F S u bsystem Fault De tect ion Funct ion S F E S u p pl ier Fu rn i s h ed Equi pme n t S G S ignal Ge n era tor S I ( 1 ) Se lect ive In terroga t ion ( 2 ) S ta n dby In strume n ts ( 3 ) S u p port i ng In terroga tor S I C A S Sec on d a ry Surve i l la nce Radar Im prove me n ts and C ol l i s ion Avoid a nce Syste m S I C A S P Sec on d a ry Surve i l la nce Radar Im prove me n ts And Col l i s ion Avoid a nce System Pa n e l S I D S ta n d a rd In strument De pa rt u re S i d e t o n e The re product ion of so un ds in a hea dset (or speaker ) from the tra n s m i t ter of the sa me com mun ic a t ion se t . This allows a per son to hear his/her own voice wh e n tra n s m i t t i ng. S I F ( 1 ) S ta n d a rd In terch a nge Form a t ( 2 ) System In tegra t ion Fac i l i ty S I G M E T S S ign i ficant Me teorological Observa t ion s S I L ( 1 ) Systems In tegra t ion Lab ( 2 ) Service Inform a t ion Le t ter S i m p l ex A c om mun ic a t ion opera t ion that uses only a sing le channel for transmit and rece ive opera t ion s. C om mun ic a t ions can take place in only one di rect ion at a time. S I P S i ng le In-line Pack age S I TA Soc ie te In tern a t ion a le de Te lec om mun ic a t ion s Aeron au t iques S I T P / D System In tegra t ion Test Pla n / Desc ri p t ion S I T System In tegra t ion and Test S I T R System In tegra t ion Test Re port S I U Sa te l l i te In terface Un i t S D ( 1 ) S ide Display ( 2 ) S torm De tect ion . It is the des ign a t ion for th e h o u rly tra n s m i t ted radar observa t ions from th e N WS and A RTCC ra d a r s. In dividual SDs are c om bi n ed and tra n s m i t ted once an hour as c ol lect ives ( SDUs) over the avia t ion te le type c i rcui ts. S D D S ta n d a rd Disk Drive S D I So u rce Dest i n a t ion Id e n t i fier S D M S peaker Drive Module S D P S u rve i l la nce Da ta Process i ng S D R A M Synch ron o us Dyn a m ic Random Access Me m ory S D R L S u p pl ier Da ta Requi re me n ts List S D U ( 1 ) Sa te l l i te Da ta Un i t ( 2 ) Se n sor Display Un i t ( 3 ) Service Da ta Un i t S e a r c h In this mod e, the DME scans from 0 mile to the outer ra nge for a re ply pul se pair after tra n s m i t t i ng an i n terroga t ion pul se pa i r. S E C Sec on d a ry S E D Sec on d a ry EICA SD i s play SEI ( 1 ) Softwa re Engi n eeri ng In st i t u te ( 2 ) S ta n dby Engine In dic a tor S E L ( 1 ) Se lect ( 2 ) Se lector Id e n t i fier S E L C A L Se lect ive Calling Syste m . A system used in c on j unct ion wi th HF and VHF com mun ic a t ion systems that allows a gro un d - ba sed ra dio opera tor to call a sing le airc raft or group of airc raft wi thout th e a i rc raft per sonnel mon i tori ng the gro und sta t ion ra dio freque nc y. S e n s i t i v i t y An instruct ion given to the TCAS equi pment for Level c on trol of its th reat vol ume. C o m m a n d S E P C Sec on d a ry Electrical Power Con tactor S E P P S tress Eva l u a t ion Predict ion Progra m S E R N O Serial Num ber 8 8 9 1 S M T ( 1 ) Ai leron / R u d d er Servo Mo un t ( 2 ) Eleva tor Servo Mo un t ( 3 ) Servo Mo un t ( 4 ) S ta bi l izer Trim Servo Mo un t ( 5 ) S ta n d a rd Message Text ( 6 ) S ta t ion Ma n age me n t S N S u b n e twor k S N A System Ne twork Arch i tect u re S N AC S u b n e twork Access S N A c P S u b n e twork Access Pro toc ol S N C R S u b n e twork Con n ect ion Refere nce S N D C F S u b n e twork De pendent Converge nce Funct ion S N D C P S u b n e twork De pendent Converge nce Pro toc ol S N I C F S u b n e twork In d e pendent Converge nce Funct ion S N L E S u b n e twork Link Esta bl i s hme n t S N M P S i m ple Ne twork Ma n age ment Pro toc ol S N PA S u b n e twork Point of At tachme n t S N P D U S u b n e twork Pro toc ol Da ta Un i t S N R S ign a l - to - Noi se Ratio S N S D U S u b n e twork Service Da ta Un i t S O F Safe ty Of Fl ig h t S O H S ta rt of Hea d er S O I System Opera tor In struct ion s S O I T Sa te l l i te Opera t ional Im ple me n ta t ion Tea m S O M Softwa re Opera tor Ma nu a l S O N S ta te ment of Opera t ional Need S O P S ta n d a rd Opera t i ng Procedu re S O PA S ta n d a rd Opera t i ng Procedu re Am pl i fied S O S S i l ic on On Sa p p h i re S P S pace S k y w a v e A ra dio wave that is reflected by the ion os p h ere. De pe n di ng upon the sta te of the ion os p h ere, th e reflected ra dio wave may pro paga te along the layer of the ion os p h ere or be reflected at some ang le. It is also kn own as ion os p h eric or indi rect wave. S L Se n s i t ivi ty Leve l S / L S u b - Leve l S L A Service Level Agree me n t Slant Range The line-of - s ight di sta nce from the airc raft to a DME gro und sta t ion . S L C Synch ron o us Link Con trol S L H System Level Hea l th S L I System Level In terface S L M S ta n d a rd Le ng th Message S L o C So u rce Lines of Cod e S L S S id e - Lo be Suppress ion . A system that preve n ts a tra n s pon d er from re plyi ng to the sid e - lo be i n terroga t ions of the SSR. Re plyi ng to sid e - lo be i n terroga t ions wo uld supply fa l se re pl ies to the ATC gro und sta t ion and obscu re the airc raft loc a t ion . S L U C System Level Use Case S LV ( 1 ) Service Level Veri fier ( 2 ) Sync Lock Va lve S M A S u rface Move ment Advi sor S M C System Ma n age ment and Com mun ic a t ion S M D S u rface Mo unt Device S M D S Swi tch ed Mul t i - mega bit Da ta Service S M E System Ma n age ment En t i ty S M G C S S u rface Move ment Guid a nce and Con trol Syste m s S M I S ta n d a rd Message Id e n t i fier s S M L S Sea m less Pipe and Tu be S M S S pectrum Mon i tori ng Syste m 9 0 9 3 S q u i t t e r ( 1 ) The ra n d om pul se pairs ge n era ted by the gro un d sta t ion as a fi l ler sign a l . ( 2 ) The tra n s m i ss ion of a spec i fied re ply format at a m i n i mum ra te wi thout the need to be i n terroga ted. ( Fi l ler pul ses tra n s m i t ted be twee n i n terroga t ions) . ( 3 ) S pon ta n eo us Tra n s m i ss ion ge n era ted once per sec ond by tra n s pon d er s. S R Service Request S R A D D Softwa re Requi re me n ts And Des ign Desc ri p t ion S R A M S ta t ic Random Access Me m ory S R D Systems Requi re me n ts Docume n t S R E J Se lect ive Re ject S R M Se lect ive Re ject Mod e S R P Se lected Refere nce Poi n t S R R Sa te l l i te Rec ogn i t ion Rece iver S R T Sa te l l i te Rece iver Tra n s m i t ter S R U Shop Re placea ble Un i t S S B S i ng le Sid e ba n d. An AM signal that has a reduced c a rrier, wi th the power appl ied to a sing le sid e ba n d. S i nce the ba n dwidth of the inform a t ion - c a rryi ng s ignal is reduced, a be t ter sign a l - to - n oi se ra t io is o b ta i n ed at the rece iver. S S C V / D R Sol id - S ta te Cock pit Voice / Da ta Rec ord er S S C V R Sol id - S ta te Cock pit Voice Rec ord er S S E C S ta t ic So u rce Error Correct ion S S F D R Sol id - S ta te Fl ight Da ta Rec ord er S S M S ign Sta t us Ma tri x S S R Sec on d a ry Surve i l la nce Radar. A ra d a r- type system that requi res a tra n s pon d er to transmit a re ply sign a l . S S S C S i ng le Sid e band Suppressed Carrier. A SSSC signal is a band of au dio inte l l ige nce freque nc ies that have been tra n s la ted to a band of ra dio freque nc ies wi th o u t di stort ion of the inte l l ige nce sign a l . S PAT E S pec ial Purpose Au tom a t ic Test Equi pme n t S P C S ta t i st ical Process Con trol S P D S peed S P E Se l ler Purch a sed Equi pme n t Speed of Re prese n ted by the sym bol c and has a va l ue of L i g h t 2.9979250 x 108 me ter s / sec ond or 983,571,194 fee t / sec on d. S P I S pec ial Pos i t ion Id e n t i fic a t ion S P I P Des ign a t ion for a tra n s pon d er ident pul se. S P K R S peaker S P M ( 1 ) S ta bi l izer Pos i t ion Modules ( 2 ) S u rface Pos i t ion Mon i tor S p o k i n g Refers to a di s play prese n ta t ion that ra dia tes outwa rd from the di s play origin like the spo kes on a wagon wh ee l . S P R Sync Phase Rever sa l . ( Term is used in Mode S tra n s pon d er s.) S P S ( 1 ) Se n sor Process i ng Subsyste m ( 2 ) S ta n d a rd Pos i t ion i ng Service SQ or Sql Sque lch S Q Service Quality S Q B Service Quality / Bi l l i ng Processor S Q D Service Quality Da ta S Q L S truct u red Query Langu age S Q P S ignal Quality Pa ra me ter Squall Line A squall line is a line of th un d er storms and d eve lo pi ng th un d er storm s. S q u a w k Re ply to interroga t ion signal (XPD ). S q u e l c h A c on trol and/or circuit that reduces the gain in res pon se of a rece iver. The sque lch is used to e l i m i n a te the output noi se of the rece iver when a s ignal is not be i ng rece ived. 9 2 9 5 S T D M A Synch ron ized Ti me Divi s ion Mul t i ple Access S T E P C L B S tep Climb S T I U Sa te l l i te Te lec om mun ic a t ions In termedia te Un i t S T M Serial Tra n s i t ion Module S TO L S h ort Takeoff and Landi ng S T P S ta n d a rd Te m pera t u re and Press u re S T S S ta ble Ti me Subfie ld S T X S ta rt of Text S U S ignal Un i t S UA S pec ial Use Ai r s pace S U L Yaw Da m per Act u a tor S U O ( 1 ) Ai leron / Eleva tor / R u d d er Servo ( 2 ) Servo Act u a tor S u p e r - A rece iver in wh ich the inc om i ng RF sign a l h e t e r o d y n e is mixed to produce a lower intermedia te Re c e i v e r freque nc y. S u p p r e s s o r A p ul se used to di sa ble L-band avion ics du ri ng th e P u l s e tra n s m i t t i ng period of anoth er piece of L-ba n d a i r borne equi pme n t . It preve n ts the oth er avion ic s a boa rd the airc raft from be i ng damaged or interfered wi th by the tra n s m i ss ion and any noi se assoc ia ted wi th that tra n s m i ss ion . S U P P S Regional Supple me n ta ry Procedu res S U T ( 1 ) Au to th ro t tle Servo ( 2 ) S ta bi l izer Trim Servo ( 3 ) System Un d er Test S V S pace Ve h ic le S V C ( 1 ) Service ( 2 ) Swi tch ed Vi rtual Circui t S VO Servo S V R R Service Rea di n ess Review S V T Servo T h ro t tle S S U S u bsequent Signal Un i t S T S ta t i st ic s s t a S ta t ion S TA B S ta bi l izer S t a n d a r d Re prese n ts the mean or average pro pert ies of th e A t m o s p h e r e a tm os p h ere. At sea level sta t ic press u re is 29.92 In H g and te m pera t u re is +15 ° C. S t a n d b y A DME mode that appl ies power to the DME RT b u t M o d e the unit does not tra n s m i t . S TA R S ta n d a rd Terminal Arrival Ro u tes S TA R S S ta n d a rd Terminal Au tom a t ion Re place ment Syste m Static Po r t s Fl us h - m o un ted ope n i ngs in the skin of the airc raft fuse lage used to se n se sta t ic press u re. S t a t i c Am bient atm os p h eric press u re or sta t ic press u re is P r e s s u r e the force per unit area exerted by the air on th e s u rface of a body at rest re la t ive to the air. Static RAM RAM con structed of bi sta ble tra n s i stor ele me n ts. Me m ory cells do not requi re refres h i ng. ( See Dyn a m ic RA M.) Static Source A c orrect ion appl ied to sta t ic so u rce press u re Error (SSEC) mea s u re me n ts to pa rtly or com ple te ly correct for press u re errors that are caused by airflow ch a nges. It is c om p u ted as a funct ion of Mach and altitude ba sed on mea s u red errors for a pa rt icular sta t ic syste m . S T B Systems Test bed S T B Y S ta n dby In strume n ts S TC ( 1 ) Se n s i t ivi ty Ti me Con trol . A c on trol circuit used in radar appl ic a t ions to con trol rece iver gain wi th res pect to time. ( 2 ) S u p ple me n tal Type Cert i fic a te S TC M S ta bi l izer Trim Con trol Module S T D ( 1 ) S ta n d a rd ( 2 ) System Tech n ical Desc ri p t ion S T D B Y S ta n dby In strume n ts 9 4 9 7 TAU TAU is the minimum time a fl ight crew needs to di scern a col l i s ion th reat and take eva s ive act ion . It re prese n ts the perform a nce enve lo pe (speed and pa th of airc raft) divid ed by the clos u re ra te of any intru d er a i rc raft (TCA S ). TAW S Terrain Awa re n ess Wa rn i ng Syste m T B B Tra n sfer Bus Breaker T B D To Be De term i n ed T B O Ti me Be tween Overh aul s T B S ( 1 ) To Be Spec i fied ( 2 ) To Be Suppl ied TC ( 1 ) Tra n s port Con n ect ion ( 2 ) Type Cert i fic a te T / C To p - of - C l i m b TCA ( 1 ) Terminal Con trol Area ( 2 ) T h ro t tle Con trol Asse m bly TCA S Traffic A lert Col l i s ion Avoid a nce Syste m TCAS I A ba seline system that provid es a wa rn i ng (TA) to th e fl ight crew of the prese nce of anoth er airc raft ( po te n t ial col l i s ion th reat) wi thin the surve i l la nce a rea . No avoid a nce maneuver is sug gested. TCAS II A c ol l i s ion avoid a nce system providi ng traffic i nform a t ion (wi thin approxi m a te ly 30 nmi of th e a i rc raft) to the fl ight crew, in addi t ion to the resol u t ion a dvi sories (RA) (for vert ical maneuvers only ). A TCA S I I - equi p ped airc raft will coordi n a te wi th TCA S I I - equi p ped intru d er airc raft to provid e c om ple me n ta ry maneuver s. TC C Tu r bine Case Cool i ng TC F Terrain Clea ra nce Floor TC M Tech n ical Coordi n a t ion Mee t i ng TC M S Test Con tent Ma n age ment Syste m TC N TACA N TC P Tra n s m i ss ion Con trol Pro toc ol S V U Sa te l l i te Voice Un i t S / W Softwa re S WA P Severe Wea th er Avoid a nce Progra m S W I T Softwa re In tegra t ion and Test S W T R R Softwa re Test Rea di n ess Review s y s Syste m S Y S System Id e n t i fier S Y S C AT- B System Category B (FA A Message Form a t ) S Y S C I System Configu ra t ion Ite m TA Traffic Advi sory (TCA S ) TA D Terrain Awa re n ess Display TAC ( 1 ) Test Access Con trol ( 2 ) T h rust Asym me try Com pe n sa t ion TAC A N The Tact ical Air Naviga t ion System that provid es azi mu th and di sta nce inform a t ion to an airc raft from a fi xed gro und sta t ion (as opposed to DME providi ng only di sta nce inform a t ion ). Ta c h Tach ome ter TACI U Test Access Con trol In terface Un i t TA F Terminal Area Forec a st (ICAO ) TA I T h ermal An t i - Ic i ng TA P Terminal Area Product ivi ty TA R Trials ATN Ro u ter Ta r g e t An airc raft wi thin the surve i l la nce ra nge of TCA S. TA S True Ai r s peed TAT ( 1 ) To tal Air Te m pera t u re. The air te m pera t u re i nc l u di ng heat ri se due to com press i bi l i ty. ( 2 ) True Air Te m pera t u re TATC A Terminal Air Traffic Con trol Au tom a t ion 9 6 9 9 T F T Thin Film Tra n s i stor T F T P Trivial Fi le Tra n sfer Pro toc ol T F T S Terrestrial Fl ight Te le p h one Syste m T G ( 1 ) Ti mer - V DL Ma n age ment En t i ty ( 2 ) Tra n s m i ss ion Ga te T G 3 GS’s Ma xi mum Ti me Be tween Tra n s m i ss ion s T G 4 Ma xi mum Ti me Be tween GSIF’s Ti mer T G C Tu r b ule nce Gain Con trol T G S Ma xi mum Link Overlap Ti mer T GT Ta rge t T H D G True Hea di ng T H R T h rust THR HOLD T h ro t tle Hold T h r e a t A ta rget that has sa t i sfied the th reat detect ion logic and th us requi res a traffic or resol u t ion advi sory ( TCA S ). T H S A Tri m m a ble Horizon tal Sta bi l izer Act u a tor T I A Te lec om mun ic a t ions In dustry Assoc ia t ion T I A S True In dic a ted Ai r s peed T I S Traffic Inform a t ion Service T K Track Ang le T K E Track Ang le Error T / L To p - Leve l T L Terminal Loc a t ion (ACA RS / AFE PS ) T L A T h rust Lever Ang le T L M Te le me try Word T L S Ta rget Level of Safe ty T M Ti mer - Media Access Con trol T M A Terminal Con trol Area TC P I P Tra n s port Con trol Pro toc ol / In ternet Pro toc ol TC Q T h ro t tle Con trol Quadra n t TC S To uch Con trol Steeri ng TC U ( 1 ) TACAN Con trol Un i t ( 2 ) Te le p h one Conver s ion Un i t TCXO Te m pera t u re Con trol led Crystal Osc i l la tor T / D To p - of - Desce n t T D L S Tower Da ta Link Syste m T D M In the Ti me Divi s ion Mul t i plex Systems a com m on c a rrier is shared to transmit mul t i ple messages (to mul t i ple rece ivers) by time shari ng the carrier be tween the message so u rces. T D M A Ti me Divi s ion Mul t i plex Access. When mul t i ple tra n s m i t ters are us i ng a sing le carrier to transmit to a s i ng le rece iver, the carrier is time shared be twee n each of the tra n s m i t ter s, so the mul t i ple messages are not ga r bled at the rece iver. T D O P Ti me Dilution Of Prec i s ion . A term used to desc ri be the error introduced by va ria nces in the calcula ted t i me. T D R Tra n s pon d er T D S Terminal Display Syste m T D S T Tower Da ta Services Term i n a l T DW R Terminal Do p pler Wea th er Radar T E C T h erm o - Electric Cooler T E I Text Ele ment Id e n t i fier s T E M P Te m pera t u re Temperature A se n sor pro tru di ng into the airstream to se n se air P r o b e te m pera t u re. Requi res correct ion to get sta t ic air te m pera t u re. T E R P S ( 1 ) Terminal En Ro u te Procedu res ( 2 ) Terminal In strument Procedu res T E S Trials End System (for AT N ) T F M Traffic Flow Ma n age me n t 9 8 1 0 1 T R Te m pora ry Revi s ion . A d ocume n t , pri n ted on ye l low pa per that te m pora ri ly ame n ds a page or pages of a c om ponent mainte n a nce manu a l . T / R ( 1 ) T h rust Rever ser ( 2 ) Tra n sce iver (see RT ) ( 3 ) Tra n s m i t ter- Rece iver T R A ( 1 ) Te m pora ry Reserved Ai r s pace ( 2 ) T h rust Reduct ion A l t i t u d e T R AC Terminal Radar A p proach Con trol Tr a c k ( 1 ) The actual pa th , over the gro un d, trave led by an a i rc raft (naviga t ion ). ( 2 ) In this mode the DME tra n s m i ts a reduced pul se pair ra te after acqui ri ng lock - on (DME ). ( 3 ) E st i m a ted pos i t ion and ve loc i ty of a sing le a i rc raft ba sed on corre la ted surve i l la nce data re ports (TCA S ). T R AC O N Terminal Radar A p proach Con trol T R AC S Test and Re pair Con trol Syste m . An au tom a ted data re trieval syste m .T RACS funct ions include: 1) provid e the loc a t ion of any given unit at any time; 2) provid e an effic ient flow of work to and from test sta t ion s ; 3 ) provide quick access to qu a l i ty inform a t ion ge n era ted by the actual test i ng process (performed by the tech n ic ian); 4) provide sta t i st ical and historic a l d a ta rega rdi ng th ro ughput time for products, fa i l u re, yie ld ra tes, WIP, e tc. Tr a f f i c Inform a t ion given to the pi lot perta i n i ng to th e A d v i s o r y pos i t ion of anoth er airc raft in the immedia te vic i n i ty. The inform a t ion con tains no sug gested maneuver s. ( Traffic advi sory airspace is 1200 feet above and be low the airc raft and approxi m a te ly 45 sec on ds di sta n t wi th res pect to clos u re speed of the airc raft .) Tr a f f i c The num ber of tra n s pon d er- equi p ped airc raft wi th i n D e n s i t y R nau t ical miles (nmi) of own airc raft , divid ed by p x (R nm i ) 2 . Tra n s pon d er- equi p ped airc raft inc l u d e Mode S and ATC RBS Mode A and Mode C, a n d exc l u d es own airc raft . ( TCA S ) T R A N S Tra n s i t ion Tr a n s c e i v e r A rece iver and tra n s m i t ter com bi n ed in a sing le un i t . Sa me as RT. T M C T h rust Ma n age ment Com p u ter T M C F T h rust Ma n age ment Com p u ter Funct ion T M C S T h rust Ma n age ment Com p u ter Syste m T M F T h rust Ma n age ment Funct ion T M S ( 1 ) T h rust Ma n age ment Syste m ( 2 ) Traffic Ma n age ment Syste m T M U Traffic Ma n age ment Un i t T N True North TO Take Off TO C ( 1 ) Top of Climb ( 2 ) Tra n sfer of Com mun ic a t ion s TO D Top of Desce n t TO EPR Takeoff Engine Press u re Ratio TO / F R O M In dic a tes wh e th er the om n i bea ri ng se lected is th e I n d i c a t o r c o u r se to or from the VOR gro und sta t ion . TO G A Take Off, Go - Aro un d. A l so seen as TO / GA . TO N1 Take Off Engine Fan Speed TO R Terms of Refere nce TOT To ta l Touchdown The point at wh ich the pred e term i n ed glid e pa th i n terce p ts the runway. TO W Ti me Of Wee k T P M U Ti re Press u re Mon i tor Un i t T P Test Poi n t T P 4 Tra n s port Pro toc ol Cla ss 4 T P D U Tra n s port Pro toc ol Da ta Un i t T P L Terminal Perm i ss ion List (ACA RS / AFE PS ) T P M Tech n ical Perform a nce Ma n age me n t T P R Tra n s pon d er T Q A T h ro t tle Quadrant Asse m bly 1 0 0 1 0 3 T S O Tech n ical Sta n d a rd Ord er. Every unit built wi th a TSO n a me pla te must meet TSO requi re me n ts. TSO o pera t i ng te m pera t u re extre mes are not the sa me as the manu fact u ri ng burn-in limits. T S S Tech n ology Support and Services T S T M Ti me So u rce Tra n s i t ion Module T T ( 1 ) Test Tool s ( 2 ) To tal Te m pera t u re TT F F Ti me To Fi r st Fi x T T L Tra n s i stor - Tra n s i stor Logic T T R TCAS II Rece iver / Tra n s m i t ter T T S Ti me To Sta t ion , an indic a t ion that di s plays th e a m o unt of time for an airc raft to reach a se lected DME gro und sta t ion wh i le trave l i ng at a con sta n t s peed. T T Y Te le typewri ter T U R B Tu r b ule nce Tu r b u l e n c e The U. S. Na t ional Wea th er Service defi n es lig h t t u r b ule nce as areas wh ere wind ve loc i ty shifts are 0 to 19 feet per sec ond (0 to 5.79 me ters per sec ond) and m od era te turbule nce as wind ve loc i ty shifts of 19 to 35 feet per sec ond (5.79 to 10.67 me ters per sec on d ). T V B C Tu r bine Vane and Blade Cool i ng T V C Tu r bine Vane Cool i ng T V E To tal Vert ical Error T W D L ( 1 ) Terminal Wea th er Da ta Link ( 2 ) Two Way Da ta Link T W D R Terminal Do p pler Wea th er Radar T W I P Terminal Wea th er Inform a t ion for Pilo ts T W P Tech n ical Work Progra m T W R Tu r b ule nce Wea th er Radar T W T Trave l i ng Wave Tu be Tr a n s p o n d e r Avion ics equi pment that re t u rns an id e n t i fyi ng cod ed s ign a l . T R D Transit Ro u t i ng Dom a i n T R K Track T R P Mode S Tra n s pon d er T R R ( 1 ) Test Rea di n ess Review ( 2 ) Test Re ject ion and Re pa i r T R S B Ti me Refere nce Sc a n n i ng Bea m . The intern a t ion a l sta n d a rd for MLS insta l la t ion s. T R U ( 1 ) Tra n sformer Rect i fier Un i t ( 2 ) True True Airspeed The true ve loc i ty of the airc raft th ro ugh th e s u rro un di ng air mass. True Altitude The exact di sta nce above mean sea level (corrected for te m pera t u re ). True Bearing The bea ri ng of a gro und sta t ion wi th res pect to true north . True North The di rect ion of the north pole from the observer. T S ( 1 ) Ti me So u rce ( 2 ) Tra n s port Service T S A ( 1 ) Tail Stri ke Asse m bly ( 2 ) Tech n ical Service Agree me n t T S A P Tra n s port Service Access Poi n t T S C Term Service Com m i tme n t T S D I U Tra n s port Service Da ta Un i t T S E To tal System Error T S I P Tri m ble Sta n d a rd In terface Pro toc ol T S M Au to th ro t tle Servo Mo unt (wi thout Clutch ) T S P ( 1 ) Tra n s m i t ted Signal Power ( 2 ) Twi sted Shie ld ed Pa i r 1 0 2 1 0 5 U S A F Un i ted Sta tes Air Force U S B U p per Sid e band is the inform a t ion - c a rryi ng band and is the freque ncy produced by addi ng the carrier freque ncy and the modula t i ng freque nc y. U S T B Un sta bi l ized U TC Un iver sal Coordi n a ted Ti me U T P Un s h ie ld ed Twi sted Pa i r U U T Unit Un d er Test U V U p per Sid e band Voice U W Un ique Word V ( 1 ) Ve loc i ty ( 2 ) Vol t V 1 C ri t ical engine fa i l u re ve loc i ty V 2 Takeoff climb ve loc i ty VA Vol t - Am peres VAC Vol ts A l tern a t i ng Curre n t VA P ( 1 ) Va l ue Ad d ed Processor ( 2 ) Visual Aids Pa n e l VA P S ( 1 ) Vi rtual A p pl ic a t ions Pro to typi ng Syste m ( 2 ) Vi rtual Avion ics Pro to typi ng Syste m VA R ( 1 ) Va ria t ion ( 2 ) Vi s u a l - Au ral Radio Range ( 3 ) Vol t - Am ps React ive VA S I Visual A p proach Slo pe In dic a tor VAU Vol tage Averagi ng Un i t V B V Va ria ble Bypa ss Va lve V C ( 1 ) Des ign Crui s i ng Speed ( 2 ) Vi rtual Circui t V C B Vi rtual Circuit Bridge V C D ( 1 ) Va ria ble Capac i ta nce Diod e ( 2 ) Vol tage Con trol led Device T X Transmit (see XMIT ) UA Un num bered Ackn owledgme n t UA R T Un iver sal Asynch ron o us Rece iver / Tra n s m i t ter UAT Un iver sal Access Tra n sce iver U B U t i l i ty Bus U B I U pl i nk Block Id e n t i fier U C I User Com p u ter In terface U C S Un i form Chrom a t ic i ty Sc a le U D User Da ta . The N-User data may also be tra n sferred be tween peer network me m bers (OSI Model) as requi red. U D P User Da tagram Pro toc ol U F D R Un iver sal Fl ight Da ta Rec ord er U H F U l tra - H igh Freque nc y. The port ion of the ra dio s pectrum from 300 MHz to 3 GH z . U I Un num bered Inform a t ion U I R U p per Inform a t ion Region U L U pl i nk U L B Un d erwa ter Loc a tor Beac on U L D Unit Load Device U M L Un i fied Mod e l i ng Langu age U M T Un iver sal Mo un t U n p a i r e d A DME channel wi thout a corres pon di ng VOR or C h a n n e l ILS freque nc y. U p l i n k The ra dio tra n s m i ss ion pa th upwa rd from the ea rth to the airc raft . U P Un iver sal Pla t form U P R M Un iver sal Pla t form Reso u rce Ma n age me n t U P S M S U PS Ma n age ment Syste m U P S Un i n terru p t i ble Power Supply 1 0 4 1 0 7 V I G V Va ria ble In tegral Guide Va n e V I S TA Vi rtual In tegra ted Softwa re Test bed for Avion ic s V I U Vid eo In terface Un i t V / L VOR / Loc a l izer V L E L a n di ng Gear Exte n d ed Plac a rd Ai r s peed V L F Very Low Freque nc y V LO Ma xi mum Landi ng Gear of Opera t i ng Speed V LO F L i ft - off Speed V L S I Very Large Sc a le In tegra t ion V LV Va lve V M Hea di ng to a manual term i n a t ion V / M Vol tme ter V M A X Ba s ic Clean Ai rc raft Ma xi mum CA S VMC ( 1 ) Visual Me teorological Con di t ion s ( 2 ) M i n i mum Con trol Speed wi th Cri t ical Engi n e O u t V M E ( 2 ) Ver sa Module Euroc a rd Bus ( 1 ) VHF Ma n age ment En t i ty, V ME bus V M E C C Ver sa Module Euroc a rd Card Cage V M I N Ba s ic Clean Ai rc raft Minimum CA S V M ( LO ) M i n i mum Ma n e uver Speed V m o The maxi mum airspeed at wh ich an airc raft is cert i fied to opera te. This can be a fi xed num ber or a funct ion of configu ra t ion (gea r, fla ps, e tc.), or altitude, or bo th . V M O N V N MS Hea l th Mon i tori ng V / N AV Vert ical Naviga t ion V N E Never- E xceed Speed V N O Ma xi mum Struct u ral Crui s i ng Speed V N R V H F Naviga t ion Rece iver V C M A X Act ive Ma xi mum Con trol Speed V C M I N Act ive Minimum Con trol Speed V C O Va ria ble Con trol led Osc i l la tor V C U V DL C on trol Un i t V D ( 1 ) Des ign Divi ng Speed ( 2 ) Hea di ng to a DME Dista nce V D C Vol ts Direct Curre n t V D L VHF Da ta Link V D R VHF Digi tal Radio V E R Ver s ion Ve r t i c a l The ra te of ch a nge of press u re altitude, us u a l ly S p e e d c a l i bra ted in hun dreds of feet per minu te. V F Des ign Flap Speed V F E Fla ps Exte n d ed Plac a rd Speed V F O Va ria ble Freque ncy Osc i l la tor V F O P Visual Fl ight Rules Opera t ions Pa n e l V F R Visual Fl ight Rules V F X R ( R ) Flap Re tract ion Speed V F X R ( X ) Flap Exte n s ion Speed V G / D G Vert ical Gyro / D i rect ional Gyro VG or VGND G ro und Ve loc i ty V G A Vid eo Gra p h ics Ad a p ter V H Ma xi mum Leve l - fl ight Speed wi th Con t i nu o us Power V H F Very High Freque nc y. The port ion of the ra dio s pectrum from 30 to 300 MHz. V H S Very High Speed V H S I C- 2 Very High Speed In tegra ted Circui ts - Phase 2 V I Hea di ng to a course interce p t V I s Lowest Se lecta ble Ai r s peed 1 0 6 1 0 9 VSL Advisory Vert ical Speed Limit Advi sory may be preve n t ive or c orrect ive (TCA S ) V S M Vert ical Se pa ra t ion Minimum V S O S ta l l i ng Speed in the Landi ng Configu ra t ion V S TO L Vert ical or Short Takeoff and Landi ng V S V Va ria ble Sta t ion Va n e V S W R Vol tage - S ta n di ng Wave Ratio. The ra t io of th e a m plitude of the vol tage (or electric fie ld) at a vol tage m a xi mum to that of an adjacent vol tage minimum . VSWR is a mea s u re ment of the mismatch be twee n the load and the tra n s m i ss ion line. V T K Vert ical Track Dista nce V TO Vol ume tric To p - Off V TO L Vert ical Takeoff and Landi ng V T R Va ria ble Takeoff Rating V / T R K Vert ical Track V U U t i l i ty Speed V X S peed for Best Ang le of Climb V Y S peed for Best Rate of Climb W ( 1 ) Wa t t ( 2 ) West WA A S Wide Area Augme n ta t ion System (Me th od of D i ffere n t ial GPS ) WA D G N S S Wide Area Differe n t ial Glo bal Naviga t ion Sa te l l i te Syste m WA F S World Area Forec a st Syste m WA I Wi ng An t i - Ice WA N Wide Area Ne twor k WA R C- 9 2 World Adm i n i stra t ive Radio Confere nce (1992 ) WA R C- M O B World Adm i n i stra t ive Radio Confere nce for the Mo bi le Service VO C R A D Voice Radio VO D Vid eo On De m a n d Vo i s p o n d A CA LSE L funct ion that wo uld au tom a t ic a l ly id e n t i fy an airc raft by a voice rec ordi ng. Voi s pond is not yet imple me n ted. VO M Vol t - Ohm - M i l l ia m me ter VO R VHF Omnidi rect ional Radio Range. A system th a t provid es bea ri ng inform a t ion to an airc raft . VO R / D M E A system in wh ich a VOR and DME sta t ion are c o - loc a ted. VO R / M B VOR / Ma r ker Beac on VO R TAC A system in wh ich a VOR and a TACAN sta t ion a re co-loc a ted. VO S Ve loc i ty Of So un d VOX Voice Tra n s m i ss ion V PAT H Vert ical Pa th V P N Ve n d or Pa rt Num ber V R ( 1 ) Takeoff Ro ta t ion Ve loc i ty ( 2 ) Hea di ng to a ra dia l V R A M Vid eo Random Access Me m ory V R E F Refere nce Ve loc i ty V R G V DL Refere nce Guid e V / S Vert ical Speed V S AT Very Small A pert u re Term i n a l V S C F Va ria ble Speed Con stant Freque nc y VSCS ( 1 ) Vert ical Sta bi l izer Con trol System used on NOTAR helic o p ter ( 2 ) Voice Swi tch i ng and Con trol Syste m V S D V DL S pec i fic DTE Ad dress V S I ( 1 ) Vert ical Speed In dic a tor ( 2 ) S ta l l i ng Speed in a Spec i fied Fl ight Configu ra t ion 1 0 8 1 1 1 W O W We ight On W h ee l s W P Wor ki ng Pa per W P T Waypoi n t W P R Waypoint Pos i t ion Re port W R S Wide- a rea Refere nce Sta t ion W R T W X R Rece iver / Tra n s m i t ter W S D D M Wea th er Support for De ic i ng Dec i s ion Maki ng W / S T E P Wi th Step Change in A l t i t u d e W T We ig h t W X Wea th er W X I W X R In dic a tor W X P Wea th er Radar Pa n e l W X R Wea th er Radar Syste m W W W World Wide We b W Y P T Waypoint A l t i t u d e X A A R INC X- B A N D The freque ncy ra nge be tween 8000 and 12500 MHz X B In tern a t ional Air Tra n s port Assoc ia t ion (IATA ) X-C h a n n e l A DME ch a n n e l .T h ere are 126 X-Channels for DME o pera t ion . For the fi r st 63 ch a n n e l s, the gro un d - to - a i r freque ncy is 63 MHz be low the air- to - gro un d freque nc y. For the sec ond 63-X Channels the gro un d - to-air freque ncy is 63 MHz above the a i r- to - gro und freque nc y. XC V R Tra n sce iver X F R Tra n sfer X I D E xch a nge Id e n t i fic a t ion X LT R Tra n s la tor X M E xternal Ma ster X M I T Tra n s m i t X M T R Tra n s m i t ter WAT R S West Atla n t ic Ro u te Struct u re Wa y p o i n t A pos i t ion along a ro u te of fl ig h t . W B C We ight and Ba la nce Com p u ter W C P W X RC on trol Pa n e l s W D Wind Direct ion W E S Wa rn i ng Electron ic Syste m W E U Wa rn i ng Electron ic Un i t W FA W X R Flat Pla te An te n n a W G S World Geod e t ic Syste m W G S- 7 2 World Geod e t ic Survey of 1972 W G S- 8 4 World Geod e t ic System 1984 W h i s p e r - A seque nce of ATC RBS interroga t ions and S h o u t s u p press ions of va ryi ng power levels tra n s m i t ted by TCAS equi pment to reduce severi ty of synch ron o us i n terfere nce and mul t i pa th pro ble m s. W I N D M G Wind Magn i t u d e W I N D R Wind Direct ion WI P Work In Progress W L D We ld ed Pipe and Tu be W M A WXR An tenna Ped estal and WXR Waveguid e Ad a p ter W M I WXR In dic a tor Mo un t W M O World Me teorological Orga n iz a t ion W / M O D Wi th Modi fic a t ion of Vert ical Profi le W M S Wide- a rea Ma ster Sta t ion W M S C Wea th er Message Swi tch i ng Center W M S C R Wea th er Message Swi tch i ng Center Re place me n t W M T W X R Mo un t W N Week Num ber W O R D G ro u pi ng of bi ts. S ize of group va ries from m ic ro processor to mic ro processor. 1 1 0 X P D ATC Tra n s pon d er (also XPDR, X PN DR, T PR ) X P D R Tra n s pon d er X S SITA X T I X / O pen Tra n s port In terface X T K C rosstrack (crosstrack error ) X T P E xpress Tra n sfer Pro toc ol Yagi Antenna An antenna wi th its maxi mum ra dia t ion pa ra l lel to the long axis of its array, c on s i st i ng of a driven di pole, a pa ra s i t ic di pole reflector, and one pa ra s i t ic di pole di rector or more. Y S A S Yaw Sta bi l i ty Augme n ta t ion Syste m Y D Yaw Da m per Z ( 1 ) Refer to reflect ivi ty factor ( 2 ) Z ulu (GM Ti me ) Z F W Zero Fuel We ig h t Z- M a r ke r A m a r ker beac on , some t i mes referred to as a sta t ion loc a tor, that provid es pos i t ive id e n t i fic a t ion to the pi lot when the airc raft is pa ss i ng di rectly over a low-freque ncy naviga t ion aid. 1 1 2

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