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TVOR very high frequency terminal omni range station.
6 N, n8 H% s; _2 JTWR Tower (Control Tower)
. k' n# P! m' m6 D! A8 ]. U/ U- rTYPE (1) As used with respect to the certification, ratings, privileges, and limitations of airmen, means a specific make and basic model of aircraft, incl... * ` @: ?' y. z+ q$ M8 c
U Airspace Euro control project Class U (unknown traffic)
" N6 ~$ c1 t {' I& I% R( A: D, [U/S unserviceable 4 p+ B1 S1 V2 {1 k; N: w, v8 l
U/V ADF UHF/VHF Automatic Direction Finding
' J' Z0 @3 A4 L9 {0 T& ^) z, Z% }UAT Universal Access Transceiver
7 ]: Z" A7 I6 u3 w! |UAV Unmanned (or Uninhabited) Aeronautical (or Aerial) Vehicle 8 G2 n0 F. s3 ?
UFN Until Further Notice
6 L* K3 g6 _/ D1 d, T6 rUFO Unidentified Flying Object 0 n1 G- y. G6 b* i# h* L8 L* ~
UHF Ultra High Frequencies (300 MHz-30 GHz)
7 A# h- [1 X bUHF/VHF AUTOMATIC DIRECTIONFINDING (U/V ADF) An Automatic Direction Finder that determines relative bearing to a transmitter to which it is tuned, in either the UHF band or VHF band; , e# j( J1 D4 j
UL Ultra light, Ultra-l©ger motoris© 0 {% R) d' c. o# h/ `4 j
ULM Ultra light, Ultra-l©ger motoris© 7 z' M( w& b* ^- I3 p" Z ~3 f
ULTRALIGHT VEHICLE An aeronautical vehicle operated for sport or recreational purposes which does not require FAA registration, an airworthiness certificate, nor pilot c...
) X' u6 l# B4 M) ZUMAS Unmanaged Air Space (Euro control Definition) ) ?7 b* x6 f1 o a" e* h) C
UNDER CAMBER This means that the lower surface of the wing has a hollow curve when observed from front to back. A thin wing with a high camber will be under camber... % Z" G# y: Z" h, [0 j
UNDERCARRIAGE STRUT A part of an airplane`s structure, designed to resist distortion, which supports the landing gear.
1 p% G% h8 H4 XUNIT FUNCTIONS A collection of functions used as standard test cases in control systems engineering; The primary unit functions of interest in avionics are the unit ... 3 @' w# Z/ [% t' j _) p
UNIT IMPULSE A function used as a standard test case in control systems engineering; a spike of "area" one at time t = 0; Synonyms: impulse; See Also: unit functio... . x8 g/ P$ V* }
UNIT LESS No units, such as ratios; a quantity with standard units of 1; a quantity with primary units of 1; Synonyms: dimensionless; ! }. z1 @& ?4 \# P
UNIT RAMP A function used as a standard test case in control systems engineering; a line of slope 1 starting at zero at time t = 0; Synonyms: ramp; See Also: un... 8 U* B. b' w5 v+ i, r
UNIT STEP A function used as a standard test case in control systems engineering; a step from zero to one at time t = 0; Synonyms: step; See Also: unit function... + a$ S$ F9 v& \" ]' |! I% i# g
UNITED STATES in a geographical sense, means (1) the States, the District of Columbia, Puerto Rico, and the possessions, including the territorial waters, and (2) t...
- [ c2 ^( G" d) Y" rUNITED STATES AIR CARRIER a citizen of the United States who undertakes directly by lease, or other arrangement, to engage in air transportation.
0 l, w+ L0 j( q# ~* yUNITS A standard quantity, such as ft or mi; Synonyms: dimension; 4 M Y! g, u7 J& {* }
UNIVERSAL TRANSVERSE MERCATOR(UTM) A system of fixed earth coordinates, sometimes used instead of latitude and longitude, accurate relative to others close by, such as ground troops; % B+ G6 X& S% ]! ]) r0 f
UPDATE A process by which position is reset with a known better position; updates occur at the data source level or at the physical device level, depending u...
o4 s( h' d `/ x) v, sUPKEEP Codename for Barnes Wallis` bouncing bomb used in the Dambusters` raid # W; M0 L- l4 @& i2 J) n
URB User Relations Bureau (CFMU)
8 U+ n% ^# c" w" s( eUSABLE FUEL (LBS) Usable fuel (gallons) x 6.7 lbs/gallon
0 F$ b N, G) v' O3 V; G" tUSAF US Air Force
7 B# l6 }) [* F% {+ O5 r2 oUSEFUL LOAD Maximum Ramp Weight - (minus) Basic Operating Weight # j* J' t2 j! S' Q
USG (AL) US-Gallon (3.78 Liter) 1 o1 `: P1 m$ Z) @% K* L
UTC Universal Coordinated Time.
# u; M6 F! w8 u' F9 ]. x. R {UTM Universal Transverse Mercator 4 |2 t( _. B+ K- Y c3 F
V Universal Time Coordinated |
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