ANSP Air Navigation Services
ANT Airspace Navigation Team (Euro control)
AO Aircraft Operator
AOC Airline Operations Centre
AOPA Aircraft Owners and Pilots Association
AOR Aero of Responsibility
AOWIR Aircraft Operator What-If Reroute (CFMU/IFPS)
AP Auto Pilot
APERIODIC A process that executes based on events rather than a fixed rate, it is not synchronized to other processes of interest; Compare: periodic;
APP Approach (Control)
APPLIANCE means any instrument, mechanism, equipment, part, apparatus, appurtenance, or accessory, including communications equipment, that is used or intended ...
APPR Approach
APPROACH (APPR) To fly towards a point; a basic guidance mode, providing lateral guidance, longitudinal guidance, and vertical guidance to a point at an operator sele...
APPROACH SPEED The recommended speed contained in aircraft manuals used by pilots when making an approach to landing. This speed will vary for different segments of ...
APPROACH TO HOVER (AHOV) Hover approach of a rotary wing aircraft.
APPROVED unless used with reference to another person, means approved by the Administrator
APR Auxiliary Power Reserve
APRON A defined area on an airport or heliport intended to accommodate aircraft for purposes of loading or unloading passengers or cargo, refueling, parking...
APU Auxiliary power unit
ARCID Aircraft Identification
AREA The number of square inches (or feet) of the wing. It`s the wingspan multiplied by the wing`s chord. The area of a tapered wing is the wingspan multip...
AREA NAVIGATION (RNAV) means a method of navigation that permits aircraft operations on any desired course within the coverage of station-referenced navigation signals or wi...
AREA NAVIGATION LOW ROUTE means an area navigation route within the airspace extending upward from 1,200 feet above the surface of the earth to, but not including, 18,000 feet ...
AREA NAVIGATION ROUTE means an area navigation route within the airspace extending upward from, and including, 18,000 feet MSL to flight level 450
ARF Almost Ready to Fly. A prefabricated aircraft.
ARINC Aeronautical Radio, Inc. A nonprofit corporation owned by member airlines to define form, fit, and function of avionics equipment and to provide radio...
ARINC 419 Digital information transfer characteristics as applied in ARINC 500-series equipment specifications.
ARINC 547 Digital specification for ILS reference sensors.
ARINC 561 Inertial navigation system specifications.
ARINC 568 Inertial sensor DME reference specification.
ARINC 571 Inertial sensor attitude-heading reference system specifications.
ARINC 575 Digital air-data system specifications.
ARINC 700-SERIES All-digital equipment specifications for new-generation transport category aircraft.
ARINC 743 All-digital specifications for FANS-1 compatibility.
ARM To strive for a mission objective, such as flying toward a radial of a radio station; usually refers to a mode of radio navigation, such as striving t...
ARMED FORCES means the Army, Navy, Air Force, Marine Corps, and Coast Guard, including their regular and reserve components and members serving without component s...
ARN ATS Route Network
ARNS Aeronautical Radio Navigation Services
ARO Air Traffic Services Reporting Office (or Airport Reporting Office)
ARP Airport Reference Point
ARR Arrival
ASA Auto land status annunciator.
ASAP As soon as possible
ASAS Airborne Separation Assurance system
ASCB Avionics standard communication bus (Honeywell)
ASDIC :, (Allied Submarine Investigation Committee), a ship-borne sonic detection system first developed in 1917.
ASF Air Safety Foundation (AOPA-USA)
ASL Above sea level
ASM Air Space Management
ASPECT RATIO The wingspan divided by the chord. Aspect ratio is important where a wing`s efficiency is concerned. A short aspect ratio (short wings) is better for ...
ASPH Asphalt Runway
ASPIDISTRA Codename for the ground transmitters operating the DARTBOARD interference system
ASR means airport surveillance radar.
ASTRONOMICAL LATITUDE Latitude measured with respect to vector of apparent gravity; Compare: geocentric latitude, geodetic latitude; Symbols: Phi sub A; Typical Units: rad,...
ASV Air to Surface Vessel. An airborne or ship borne radar used to detect surfaced U-boats and other surface vessels.
ATA Actual Time of Arrival
ATC Air Traffic Control. A service operated by appropriate authority to promote the safe, orderly and expeditious flow of air traffic.
ATCO Air Traffic Control
ATD Actual Time of Departure
ATE Actual Time Enroute
ATFM Air Traffic Flow Management
ATI AND ATR ARINC form factors.
ATIR Air Traffic Incident Report ("Near-Miss Report")
ATIS Automatic Terminal Information Service
ATM Air traffic management.
ATMOSPHERIC DATA Air Traffic Control
ATN Air Traffic Management
ATP Airline Transport Pilot (the "highest" grade of pilot certificate)
ATPL Airline Transport Pilot (`s License)
ATS Air Traffic Services
ATSP Air Traffic Service Provider
ATTIDUDE HEADING REFERENCE SYSTEM(AHRS) Combines information from a Magnetic Heading Sensor with self-contained aircraft acceleration data to provide attitude, heading, position, body inerti...
ATTITUDE The primary aircraft angles in the state vector; pitch, roll, and yaw;
ATTITUDE INDICATOR A vacuum powered instrument which displays pitch and roll movement about the lateral and longitudinal axes.
ATV Adjustable Travel Volume. Used on many radio transmitters to limit, or extend, maximum throw of a servo. ATV can indicate having a single adjustment w...
AUDIO PANEL Electronic device used to switch between radios.
AUFKL„RUNG Reconnaissance
AUSTRALIAN NATIONAL A standard model for computing earth data
AUTOGYRO An aircraft equipped with a rotating wing, or rotor, to sustain itself in the air, and a propeller to move forward.
AUTOMATIC DIRECTION FINDING(ADF) A basic guidance mode, providing lateral guidance to a radio station. Equipment that determines bearing to a radio station;
AUTOMATIC FLIGHT CONTROL SYSTEM(AFCS) An automated system for controlling the primary flight controls, often with built-in functions for guidance and flight director, and sometimes radio n...
AUTOMATIC TERMINAL INFORMATIONSERVICE (ATIS) The continuous broadcast of recorded non control information in selected terminal areas. Its purpose is to improve controller effectiveness and to rel...
AUTOPILOT A method of an automatic flight control system which controls primary flight controls to meet specific mission requirments,I.E. maintain a heading or ...
AUTOROTATION means a rotorcraft flight condition in which the lifting rotor is driven entirely by action of the air when the rotorcraft is in motion
AUX FUEL Auxiliary fuel tanks.
AUXILIARY ROTER means a rotor that serves either to counteract the effect of the main rotor torque on a rotorcraft or to maneuver the rotorcraft about one or more of ...
AVERAGING FILTER A filter for combining multiple data sources, usually of the same type, by adding with weighted averages; a simple average of the data sources; Compar...
AVGAS Aviation Gasoline (piston aircraft fuel)
AVM Avionics monitor
AWACS Airborne Warning And Control System. An electronically very souped-up Boeing 707. (Pronounced "AY-wax.")
AWY Airway
AXIS The line around which a body rotates.
AZIMUTH An angle in the horizontal plane, usually measured with respect to body coordinates
B Airspace ICAO Class B
BABLW Bundesamt fìr Betriebe der Luftwaffe
BACKLASH Term describing the amount of play between gears, or gear mesh. If too loose, the gear can slip, or strip the teeth. Too tight, and excessive wear is ...
BALL LINK Connection using a ball, and a link which rotates on the ball. Used to connect the servo to a control surface or lever.
BALT SEL Barometric altitude select
BAND-PASS FILTER (BPF). A filter that allows frequencies between two cutoff frequencies to pass while attenuating frequencies outside the cutoff frequencies; a band-pass filt...
BANK ANGLE The angle between the horizontal plane and the right wing in the lateral plane, positive when the right wing is down; Synonyms: roll; Symbols: phi, Ph...
BARN DOOR AILERONS Larger, built up ailerons rather than an aileron from a simple strip of solid wood like some kits have.
BARNSTORMER A pilot who, in the early years of aviation, gave airplane rides to people and performed aerobatics for a fee.
BAROMETRIC ALTITDUDE SELECT(BALT SEL) A basic guidance mode, providing vertical guidance to an operator selected barometric altitude;
BAROMETRIC ALTITUDE Height with respect to fixed earth reference (above mean sea level); Synonyms: pressure altitude; Symbols: h sub b; Typical Units: ft; Dimensions: Len...
BAROMETRIC PRESSURE Height with respect to fixed earth reference (barometric altitude, feet above mean sea level); Synonyms: pressure; Symbols: p sub a; Typical Units: in...
BASE LOAD ANTENNA A rigid, short antenna mounted to the aircraft. Used to replace the longer receiver antenna.
BASIC OPERATING WEIGHT (BOW) Empty weight typically equipped + unusable fuel and trapped liquids + 2 pilots (400 lbs.) + supplies.
BAZL Bundesamt fìr Zivilluftfahrt (Swiss CAA)
BBJ Boeing Business Jet
BC Bus controller
BCD Binary coded decimal.
BDY Boundary
BEACON A device, usually based on the ground, that aids in determining position or direction;
BEAM WIDTH The included angel of a weather radar interrogation signal.
BEARING (BRG). Direction on a compass; Synonyms: direction; Symbols: B; Typical Units: rad, deg;
BEF Before
BENDIX Avionics mfgr.
BESSEL 1841 A standard model for computing earth data
BFR Biennial Flight Review (USA)
BFU Bìro fìr Flugunfalluntersuchungen
BIAS An offset applied to a measurement for error correction; Synonyms: offset
BIG BEN North Sea patrols undertaken by Bomber Command to try to detect the guidance system of the German V2 rockets.
BIG WING A plan espoused by DRS Bader during the Battle of Britain. A tactic to use five or more fighter squadrons together. The plan was not workable until af...
BINDING What occurs when the friction at a joint is stronger than the linkage.
BIS Built-in simulation
BITE Built-in test equipment.
BLACK THURSDAY August 15th 1940. The day on which the Luftwaffe took at least 90 losses.
BLADE BALANCER Usually called a "prop balancer" for aircraft. Used to ensure that the propeller and spinner are equally balanced side-to-side to avoid vibration prob...
BLEED AIR High pressure air ducted from engine to pressurize cabin and other uses.
BLITZKRIEG A tactic of aerial artillery in support of fast-moving armor. The term was inaccurately applied to the bombing of London and other British cities in 1...
BLONDE An automatic camera which provided continuous record of signals within a specified band, as received by a cathode ray tube.
BODY The aircraft, usually referring to a coordinate system;
BODY COORDINATES Coordinates referenced to the body of the aircraft; See Also: XYZ; Compare: earth coordinates, stability coordinates
BOEING The Boeing Company, with headquarters in Seattle, Washington, U.S., one of the nation`s largest exporters. The company is a major U.S. government cont...
BOOTS Inflatable device on leading edge of wings and tail. Used to remove ice.
BOOZER RAF airborne device which warned that the aircraft carrying it was being monitored by Wìrzburg
BORESIGHT ANGLE The angle between the center line of a sensor and aircraft center line, either by design or by misalignment;
BORESIGHTING A basic control to a data source from controls and displays to bore sight a device; Also, a procedure to align the center line of physical devices, us...
BORING HOLES IN THE SKY Having fun flying an R/C airplane, without any pre-determined flight pattern.
BPF Band-pass filter
BRACING WIRE A solid steel wire used to support the structure of an airplane`s wings or fuselage.
BRAKE HORSEPOWER means the power delivered at the propeller shaft (main drive or main output) of an aircraft engine
BRG Bearing
BRIAR A ground transmitter operating in the 300-600 MHz band used to jam enemy Wìrzburg ground receivers.
BRNAV Basic RNAV (RNP-5 compliant)
BSE Bovine Spongiform Encephalopathy (or: mad cow disease)
BSU Beam steering unit.
BUDDY OR TRAINER BOX Two similar transmitters that are wired together with a "trainer chord." This is most useful when learning to fly -- it`s the same as having dual cont...
BUILT-IN SIMULATION (BIS) Function in avionics software that simulates sensors, aircraft, and pilot, to exercise avionics software (including navigation, radio navigation, guid...
BUS CONTOLLER (BC). Term defining role of device on a MIL-STD-1553 bus as being master; Compare: remote terminal;
C Airspace ICAO Class C
C(-OFFICE) Crew Office (AIS/MET)
C/R Counter-rotating propellers.
CA Abbreviation for cyanoacrylate. An instant type glue that is available in various viscosities (Thin, Medium, Thick, and Gel). These glues are ideal fo...
CAA Civil Aviation Authority (of a country)
CAB Civilian Aviation Board.
CABIN PRESSURIZING A mechanism used to maintain air pressure in an airplane`s sealed cabin at a level suitable for passengers.
CALIBRATED AIRSPEED Calibrated airspeed is equal to true airspeed in standard atmosphere at sea level.
CALIBRATED AIRSPEED (CAS) The indicated airspeed of an aircraft, corrected for position and instrument error. Calibrated airspeed is equal to true airspeed in standard atmosphe...
CALIBRATION A basic control to a data source from controls and displays for calibrating a device; Also, a procedure to adjust physical devices so that they provid...
CAMBER If you draw a line through the center of the airfoil that`s exactly half-way between the top and bottom surface, you get the mean airfoil line. Depend...
CANARD The horizontal surface forward of the wing used to control pitch. It`s found on very few aircraft. Also the word used to describe aircraft that have a...
CANT ANGLE Angle of nacelle mounting; Typical Units: rad, deg;
CAPS Complete Aircraft Parachute System
CAPTURE To attain an objective, such as reaching a radial of a radio station; See Also: capture criterion; Compare: activate, arm;
CAPTURE ITERATION A test case to determine if an armed objective has been captured; In avionics, an aircraft might have an objective to fly to a radial of a radio stati...
CARBURETOR The part of the engine, which controls the speed or throttle setting and lean/rich mixture via setting of the needle valve.
CARD II CNS Applications Research
CARPET Airborne jammer of German ground radar 300-600 Megacycle band. Later American developments allowed a more precise use.
CAS Calibrated airspeed
CASA Calibrated Air Speed
CASTER To swivel or rotate slightly.
CAT Commercial Air Traffic
CAT I Instrument Landing Category I (similar: CAT II, CAT III)
CATEGORY 1) As used with respect to the certification, ratings, privileges, and limitations of airmen, means a broad classification of aircraft. Examples inclu...
CATEGORY A with respect to transport category rotorcraft, means multiengine rotorcraft designed with engine and system isolation features specified in Part 29 an...
CATEGORY B with respect to transport category rotorcraft, means single- engine or multiengine rotorcraft which do not fully meet all Category A standards. Catego...
CATEGORY I (CAT I) An ILS facility providing operation down to a 200 foot decision height and an RVR of not less than 2,400 feet.
CATEGORY II (CAT II) An ILS facility providing operation down to a 100-foot decision height and an RVR of not less than 1,200 feet.
CATEGORY II OPERATIONS with respect to the operation of aircraft, means a straight-in ILS approach to the runway of an airport under a Category II ILS instrument approach pr...
CATEGORY III OPERATIONS with respect to the operation of aircraft, means an ILS approach to, and landing on, the runway of an airport using a Category III ILS instrument appr...
CATEGORY IIIA (CAT IIIA) An ILS facility providing operation with no decision height to and along the surface of the runway with external visual reference during the final pha...
CATEGORY IIIB (CAT IIIB) An ILS facility providing operation with no decision height limit to and along the surface of the runway without reliance on external visual reference...
CATEGORY IIIC (CAT IIIC) An ILS facility providing operation with no decision height limit to and along the surface of the runway and taxiways without reliance on external vis...
CAUTION A signal which alerts the operator to an impending dangerous condition requiring attention, but not necessarily immediate action (from MIL-STD-1472D);...
CAVOK Ceiling and Visibility ok (good VFR weather)
CAVU Ceiling And Visibility Unlimited. Perfect flying weather -- no major clouds, no major haze.
CB Cumulonimbus
CBA Cost-Benefit Analysis
CCLIM Course cut limit
CDA Continuous Descent Approach
CDI Course Deviation Indicator
CDM Collaborative Decision-Making
CDR Conditional Route (FUA)
CDTI Cockpit Display of Traffic Information
CDU Control-display unit.
CEAC Conf©rence Europ©enne de l`Aviation Civile (see ECAC)
CEILING The heights above the earth`s surface of the lowest layer of clouds or obscuring phenomena that is reported as "broken," "overcast," or "obscuration,"...
CENTER An Air Route Traffic Control Center (ARTCC). See Air Route Traffic Control Center.
CENTER LINE Standard aviation term
CENTER OF PRESSURE An imaginary point on the chord of an airfoil where the total of all aerodynamic forces are assumed to act.
CENTER-POD CONFIGURATION A type of airplane whose fairly short fuselage is not connected to the tail surfaces.
CENTRIFUGAL FORCE The force created by a body`s tendency to follow a straight path working against a force which causes it to move in a curve, the resultant force which...
CEP Circular error probability
CERTIFICATED AIRPORT An airport operating under FAR Part 139. The FAA issues airport operating certificates to all airports serving scheduled or unscheduled air carrier ai...
CESC Cescom Maintenance Program.
CFI Certified Flight Instructor.
CFII Certified Flight Instructor IFR (USA)
CFIT Controlled Flight Into Terrain
CFMU Central Flow Management Unit of Euro control
CG Center of Gravity. For air crafting purposes, this is usually considered -- the point at which the airplane balances fore to aft. This point is critic...
CH Center of Gravity
CHAIN HOME An early form of radar using linked radar stations on the east and south coasts of Britain to warn of approaching aircraft.
CHANDELLE A very steep climbing turn where the airplane makes a 180ø change of direction.
CHANNEL The frequency number used by the transmitter to send signals to the receiver. If radios transmit on the same frequency, or channel, glitching will occ...
CHARGE JACK The plug receptacle of the switch harness into which the charger is plugged to charge the airborne battery. An expanded scale voltmeter (ESV) can also...
CHARGER Device used to recharge batteries and usually supplied with the radio if NiCad batteries are included.
CHASTISE Codename for the Dambusters` raid. 16-17 May 1943
CHF Swiss Francs (Bankers` code)
CHICKEN STICK A hand-held stick used to flip start a aircraft airplane engine.
CHORD The "depth" of the wing, its distance from leading edge to trailing edge. One of the components used to determine wing area. May vary from root to tip...
CHORD LINE A line drawn from the leading edge of the wing to the trailing edge.
CIA CFMU Internet Application
CILO Capacity Increase Lower airspace
CIRCULAR ERROR PROBABILITY (CEP) A probability that a percentage of two-dimension measurements will lie within a circle of given radius, with the circle centered at truth or mean of t...
CIRCUS A fighter sweep over enemy territory, particularly airfields to draw the fighters into battle.
CIV Civil
CIVIL AIRCRAFT means aircraft other than public aircraft. "Class": (1) As used with respect to the certification, ratings, privileges, and limitations of airmen, mea...
CLARKE 1866 A standard model for computing earth data
CLARKE 1880 A standard model for computing earth data
CLASS A ROTORCRAFT-LOAD COMBINATION one in which the external load cannot move freely, cannot be jettisoned, and does not extend below the landing gear
CLASS B ROTORCRAFT-LOAD COMBINATION one in which the external load is jettison able and is lifted free of land or water during the rotorcraft operation
CLASS C ROTORCRAFT-LOAD COMBINATION one in which the external load is jettisonable and remains in contact with land or water during the rotorcraft operation
CLASS D ROTORCRAFT-LOAD COMBINATION one in which the external- load is other than a Class A, B, or C and has been specifically approved by the Administrator for that operation
CLASS G AIRSPACE (UNCONTROLLEDAIRSPACE) The airspace not designated as Class A, B, C, D or E.
CLEARWAY (1) For turbine engine powered airplanes certificated after August 29, 1959, an area beyond the runway, not less than 500 feet wide, centrally located...
CLIMBOUT SPEED with respect to rotorcraft, means a referenced airspeed which results in a flight path clear of the height-velocity envelope during initial climb out
CLR Clearance (or cleared)
CLSD Closed
CLUNK Term used to describe the weighted end of the fuel pickup line in the fuel tank. The purpose of this is to ensure that the fuel pickup is always in th...
CLUTCH The section of the drive train used to engage the gear when throttle is increased, and disengage while engine is at idle. This ensures that the rotor ...
CMIC Civil Military Interface standing Committee
CMOS Complementary metal oxide semiconductor.
CMU Communications management unit.
CNS Communications, navigation and surveillance.
CNS/ATM Communication Navigation Surveillance/Air Traffic Management
COA Certificate of Airworthiness
COAL SCUTTLE A modification to an aircraft`s existing H2S navigational radar to give a visual bearing every 30 seconds on a signal under investigation.
COCKPIT VOICE RECORDER (CVR) Device that records crew conversations. Used in accident investigations.
CODA Central Office for Delay Analysis (Euro control)
COFA Certificate of Airworthiness
COHERENT DETECTION A technique used in certain ADF receivers to improve useful range.
COLLECTIVE A flight control operated by moving up or down with hand in rotary-wing aircraft, primarily to control lift (altitude); controls collective (total) pi...
COLLECTIVE CUE A vertical flight director cue for rotary-wing aircraft, primarily to control altitude, by changing power; Compare: yoke cue; Symbols: Gamma sub "VERT...
COLLINS Avionics mfgr.
COM Communications
COMBINED CENTER/RAPCON (CERAP) An air traffic facility which combines the functions of an ARTCC and a radar approach control facility.
COMMANDED Controls given to a device, not that the device necessarily obeyed the controls
COMMERCIAL OPERATOR means a person who, for compensation or hire, engages in the carriage by aircraft in air commerce of persons or property, other than as an air carrier...
COMMON TRAFFIC ADVISORY FREQUENCY(CTAF) A frequency designed for the purpose of carrying out airport advisory practices while operating to or from an airport without an operating control tow...
COMMUNICATIONS How well equipment is communicating; Values: operational, degraded, failed
COMMUTER An air carrier operator operating under 14 CFR 135 that carries passengers on at least five round trips per week on at least one route between two or ...
COMPLIMETARY FILTEROMPLEMENTARYFILTER A filter in which the complement of the filter is desired, giving the effect of a high-pass filter by implementing a low-pass filter; a filter for com...
COMPOSITE VIDEO Analog VOR receiver output before processing.
COMPUTER CYCLE In a periodic, cyclical computer system, the most basic, fastest timing loop
CONSOL a kind of low or medium frequency long range navigational aid
CONT Teledyne-Continental (engine mfgr.)
CONTACT DIGITIZER A mechanical device that converts analog information to digital codes by means of electrical contacts.
CONTINUOUS EQUATION A mathematical relationship to describe a function of time, expressed in terms of continuous time; Compare: difference equation, differential equation...
CONTINUOUS TIME Time which can have any point expressed as a real quantity, without regard for any specific interval or processing rate; Compare: discrete time;
CONTINUOUS TIME (CW) A radio carrier broadcast that does not have modulation
CONTOL LAW The mathematical definition of a system used to control or to change the dynamic response of a system;
CONTRAIL Streaks of condensed water vapor created in the air by aircraft flying at high altitudes.
CONTROL INPUTS The controlling influences a pilot exerts on an aircraft`s control surfaces.
CONTROL SURFACE Any one of the various moveable portions of the wings, tail surfaces, or canard.
CONTROL SURFACES The moving, pilot-controllable parts of the air-frame, including flaps, ailerons, rudders and elevators
CONTROLLED AIRSPACE An airspace of defined dimensions within which air traffic control service is provided to IFR flights and to VFR flights in accordance with the airspa...
CONTROLLED SPEED (CTS) A guidance control law parameter, generated by the longitudinal guidance modes; speed that is being controlled Typical Units: ft/s, kt; Dimensions: Le...
CONTROLLER ALTITUDE (CTALT) A guidance control law parameter, generated by the vertical guidance modes; altitude that is being controlled Typical Units: ft; Dimensions: Length;
CONVENTIONAL GEAR The landing gear arrangement where the airplane has a main gear and a tail wheel.
COORDINATED TURN A combination of control inputs that cause a maximally efficient turn.
COPI Communications
CORIOLIS ACCELERATION Tangential acceleration caused by motion on a radial on a rotating surface, in aviation, it is acceleration in the earth`s longitudinal direction caus...
CORKSCREWING Evasive maneuver adopted by British bombers.
CORONA British ground transmitter operating at 2.56 MHz based at Rugby and Leafield. Used to transmit confusing signals over the German night fighter RT cont...
CORRECTED ALTITUDE Measured pressure altitude corrected for instrumentation errors
COUPLED Describes operation of flight director in which automatic flight control system causes flight controls to follow commands from flight director or erro...
COURSE Towards a point at a specified course; Compare: direct
COURSE CUT LIMIT (CCLIM). A guidance control law parameter, generated by the lateral guidance modes; limits the intercept angle of the flight path with a desired course, typica...
COWL The large molded fairing around an engine. It serves two purposes when done right: It helps the airflow go smoothly around the front of the airplane, ...
COWLING A removable metal covering placed over and around an airplane`s engine (s)).
CPDLC Controller-Pilot Data Link Capability (or Communications)
CPL Commercial Pilots License
CR Class Rating
CRAM Conditional Route Availability Message
CRCO Central Route Charge Office of Euro control
CRE Class Rating Examiner
CREEP BACK The progressive dropping of bombs before the target was reached.
CREEPING LINE SEARCH A pattern of equally spaced parallel lines followed for searching the ground from an aircraft; Compare: expanding square search, sector search;
CREWMEMBER means a person assigned to perform duty in an aircraft during flight time
CRI Class Rating Instructor
CRITICAL ALTITUDE means the maximum altitude at which, in standard atmosphere, it is possible to maintain, at a specified rotational speed, a specified power or a speci...
CRITICAL ENGINE means the engine whose failure would most adversely affect the performance or handling qualities of an aircraft
CRM Cockpit Resource Management
CROSS TRACK Perpendicular to the course;
CROSS-OVER EXHAUST A mechanism through which the exhaust from one side of an inline engine is carried to the other.
CROSSTRACK DEVIATION (XTKD) A guidance control law parameter, generated by the lateral guidance modes; distance from the aircraft to a desired course measured along a perpendicul...
CROSSTRACK DEVIATION GAIN (KXTKD) A guidance control law parameter, generated by the lateral guidance modes; relative weighting of cross track deviation in the lateral control law Typi...
CROSSTRACK DEVIATION RATE (XTKR) A guidance control law parameter, generated by the lateral guidance modes; rate of change of cross track deviation Typical Units: ft/s; Dimensions: Le...
CROSSTRACK DEVIATION RATE GAIN(KXTKR) A guidance control law parameter, generated by the lateral guidance modes; relative weighting of the cross track deviation rate in the lateral control...
CRS Conditional Route System (FUA: "Temporary Airways" on request)
CRT Cathode ray tube.
CSDB Commercial standard data bus.
CTAF Common Traffic Advisory Frequency
CTALT Controlled altitude
CTR Control Zone
CTS Controlled speed
CU Cumulus
CUE A indicator to an operator for control placement, tells the operator where to place controls; Synonyms: command
CURSOR See: moving cursor, target cursor
CUST Customs
CUTOFF FREQUENCY The frequency at which the gain of a filter is at an edge of a band, usually taken to be when gain is 0.5, or -3.01dB; the
