0FUELWT Zero (0) Fuel Weight.
360, 540 AND OTHER NUMBERS Degrees in arc. 360 signifies one full turn through an axis. A 360 turn is a flat turn; where the aircraft does not roll its wings but instead just sl…
3D Flight pattern noted by performance of particular aerobatics below an airplane.
3F Informal reference for flip flop flying. Similar to 3D, except not as smooth.
A Aircraft (JAR – FCL License)
A/C Air conditioner Unit
A/G Aircraft. Air Craft
A/T Automatic throttle.
AAIM Aircraft Autonomous Integrity Monitor
ABAS Aircraft Based Augmenting System.
ABC Aluminum-Brass-Chrome. Three main components used in the production of engines that do not have rings. Engines with aluminum piston, chrome or nickel …
ABL Advanced Bimetallic Liner. A Specialized form of ABN. Instead of a single-material plating,single-step, the ABL Plating process is based on a layered …
ABN Aluminum-Brass-Nickel. The components used in the production of non-ringed engines. These engines use an aluminum piston, and a nickel plated brass sl…
ABOVE GROUND LEVEL (AGL). Distance between the aircraft and the ground Synonyms: radar altitude;
ABSOLUTE Fixed reference, as opposed to moving reference.
AC Advisory circular
ACARS Airline Communication and Reporting System.
ACAS Airborne Collision Avoidance System
ACC Area Control Center.
ACCELARATION Rate of change of velocity, either scalar or vector, often with subscripts such as ENU or XYZ to denote the coordinate frame; time derivative of veloc…
ACCELERATION EAST Aircraft acceleration in true east direction; Symbols: A sub E; Typical Units: ft/s-squared; Dimensions: Length / Time-squared;
ACCELERATION NORTH Aircraft acceleration in true north direction; Symbols: A sub N; Typical Units: ft/s-squared; Dimensions: Length / Time-squared;
ACCELEROMETER An inertial device for measuring acceleration, usually in three orthogonal axes (lateral X, longitudinal Y, and vertical Z); accelerometers usually co…
ACCEPT To allow to proceed, for example with a position update, usually by an operator; Compare: reject
ACCIDENT Occurrence associated with the operation of an aircraft which takes place between the time any person boards the aircraft with the intention of flight…
ACCURACY Measure of exactness, possibly expressed in percent; Compare: precision
ACG ATM/CNS Consulting Group (Euro control)
ACI Airport Council International
ACQUIRE To begin reception of useful data
ACT active, activated, activation message
ACTIVATE To begin performing a mission objective, such as flying along a radial of a radio station; usually refers to a mode of radio navigation, such flying a…
AD Directive; Maintenance or modification ordered by FAA.
ADC Air Data Computer
ADCUS Advise customs
ADD Architecture Description Document
ADDR Air data computer
ADF Automatic Direction Finder
ADI Attitude direction indicator
ADIZ Automatic Direction Finder
ADLP Airborne Data Link Processor
ADMINISTRATOR means the Federal Aviation Administrator or any person to whom he has delegated his authority in the matter concerned
ADS Automatic dependent surveillance
ADS-A Automatic Dependent Surveillance
ADS-B Automatic Dependent Surveillance-Broadcast
ADS-C Automatic Dependent Surveillance-Contract
ADVERSE YAW Yaw generated when the ailerons are used. The lifting wing generates more drag, causing the plane to yaw toward it.
ADVISORY Automatic Direction Finding
AEA Association of European Airlines
AECMA Association of European Aerospace Industries
AEROBATICS Acrobatic or stunt maneuvers in the air such as loops, rolls, and others.
AERODYNAMIC COEFFICENTS means non-dimensional coefficients for aerodynamic forces and moments
AES Aircraft Earth station
AFB Air Force Base
AFCS Automatic flight control system
AFD Adaptive flight displays
AFDS Autopilot flight director system
AFIS Automated flight information system (AlliedSignal)
AFM Airplane Flight Manual
AFT Towards the rear. Used such as: “…with an aft center of gravity….”
AFTER RUN OIL A lubricant designed to displace unburned fuel in the engine after running. The fuel can accelerate corrosion on some engine parts. By using an after …
AFTN Aeronautical Fixed Telecommunication Network
AGA Aerodromes and Ground Aids (AIP)
AGATE Advanced General Aviation Transport Experiments (NASA)
AGDL Air-Ground Data Link
AGL Above Ground Level. Used in reference to altitude, e.g. 5000 ft AGL. See also MSL.
AGLO Above Ground Level
AGR Automatic flight control Sys.
AGR SLANT RANGE Straight-line distance from the aircraft to a point on the ground;
AHOV Approach to hover
AHRS Attitude-heading reference system.
AI Altitude indicator
AIC Aeronautical Information Circular
AIDING A process by which one or more sensors provide data to another sensor to produce results better than any single sensor; aiding occurs at the data sour…
AILERON A control surface on fixed-wing aircraft, usually mounted on the aft edge of wings, that controls roll, and is controlled by the wheel; Symbols: delta…
AILERONS Hinged control surfaces on usually the wing which can change the wing`s lifting properties. Often located near the tips. Used to bank the aircraft. Th…
AIM ATFM Information Message
AIM (AIRMANS` INFORMATION MANUAL) A primary FAA publication whose purpose is to instruct airmen about operating in the US airspace system.
AIP Aeronautical Information Publication
AIR CARRIER Person who undertakes directly, by lease, or other arrangement, to engage in air transportation.
AIR DATA Values computed from pitot, static and temperature measurements, usually by means of a digital computer; ARINC 575 defines outputs.
AIR DATA COMPUTER (ADC) A primary navigation data source. A navigation sensor based on atmospheric data sensors; usually measures static pressure, dynamic pressure, and outsi…
AIR DATA DEAD RECKONING (ADDR) Dead reckoning navigation based on simple instruments as source (barometric altimeter, magnetic compass, airspeed indicator, known wind conditions); s…
AIR DEFENSE IDENTIFICATION ZONE(ADIZ) The area of airspace over land or water, extending upward from the surface, within which the ready identification, the location, and the control of ai…
AIR GROUND RANGING (AGR) Straight-line distance from the aircraft to a point on the ground;
AIR ROUTE TRAFFIC CONTROL CENTER(ARTCC) OR CENTER Facility established to provide air traffic control service to aircraft operating on IFR flight plans within controlled airspace and principally durin…
AIR TAXI An aircraft operator who conducts operations for hire or compensation in accordance with FAR Part 135 in an aircraft with 30 or fewer passenger seats …
AIR TRAFFIC means aircraft operating in the air or on an airport surface, exclusive of loading ramps and parking areas
AIR TRAFFIC CLEARANCE means an authorization by air traffic control, for the purpose of preventing collision between known aircraft, for an aircraft to proceed under specif…
AIR TRAFFIC CONTROL means a service operated by appropriate authority to promote the safe, orderly, and expeditious flow of air traffic
AIR TRAFFIC CONTROL (ATC) A service operated by the appropriate authority to promote the safe, orderly, and expeditious flow of air traffic.
AIR TRAFFIC CONTROL (ATC). Standard aviation term
AIR TRANSPORTATION means interstate, overseas, or foreign air transportation or the transportation of mail by aircraft. Alert Area. An alert area is established to infor…
AIR-MASS FLIGHT PATH ANGLE Angle in vertical plane of earth speed vector and groundspeed vector; occasional definition for flight path angle; Compare: earth-referenced flight pa…
AIRAC Aeronautical Information Regulation and Control
AIRBORNE GROCER A device for barrage-jamming of Wurzburgs. Extremely vulnerable to being homed onto.
AIRCRAFT means a device that is used or intended to be used for flight in the air
AIRCRAFT (AC) A craft that flies in the air; either fixed or rotary wing.
AIRCRAFT ENGING means an engine that is used or intended to be used for propelling aircraft. It includes turbo superchargers, appurtenances, and accessories necessary…
AIRFOIL The shape of the wing when looking at its profile. Usually a raindrop type shape.
AIRFRAME means the fuselage, booms, nacelles, cowlings, fairings, airfoil surfaces (including rotors but excluding propellers and rotating airfoils of engines)…
AIRPLANE means an engine-driven fixed-wing aircraft heavier than air, that is supported in flight by the dynamic reaction of the air against its wings
AIRPORT An area on land or water that is used or intended to be used for the landing and takeoff of aircraft and includes its buildings and facilities, if any…
AIRPORT TRAFFIC CONTROL TOWER(ATCT) A terminal facility that uses air/ground communications, visual signaling, and other devices to provide ATC services to aircraft operating in the vici…
AIRSHIP means an engine-driven lighter-than-air aircraft that can be steered
AIRSPEED The speed of an aircraft relative to its surrounding air mass. See: calibrated airspeed; indicated airspeed; true airspeed.
AIRSPEED (AS, A/S) See Also: state data, true airspeed, indicated airspeed, calibrated airspeed; Symbols: V sub A/S; Typical Units: kt, ft/s; Dimensions: Length / Time;
AIRSPEED INDICATOR An onboard instrument which registers velocity through the air, in miles per hour or in knots.
AIRY A standard model for computing earth data
AIS Aeronautical Information Service
ALIGHNMENT A basic control to a data source from controls and displays to align a device. Also a procedure to align physical devices, usually navigation sensors,…
ALL-WEATHER FIGHTER/INTERCEPTOR -equipped jet fighter airplane which can operate at night or in the worst weather.
ALS approach light system.
ALTERNATE AIRPORT means an airport at which an aircraft may land if a landing at the intended airport becomes inadvisable
ALTIDUTE GAIN (KALTINT) A guidance control law parameter, generated by the vertical guidance modes; varies control authority of the altitude integral in vertical guidance, to…
ALTIMETER An onboard instrument which senses air pressure in order to gauge altitude.
ALTIMETER SETTING The barometric pressure reading used to adjust a pressure altimeter for variations in existing atmospheric pressure or to the standard altimeter setti…
ALTINTVAL Altitude integral input
ALTITUDE Height, usually with respect to the terrain below (radar altitude, feet above closest dirt) or fixed earth reference (barometric altitude, feet above …
ALTITUDE ENGINE means a reciprocating aircraft engine having a rated takeoff power that is producible from sea level to an established higher altitude
ALTITUDE ERROR A basic output from guidance to flight director, indicating the difference between actual altitude and desired altitude; Symbols: DELTA h; Typical Uni…
ALTITUDE ERROR SCALE FACTOR(KZSF) A guidance control law parameter, generated by the vertical guidance modes; varies control authority of vertical guidance
ALTITUDE INTEGRAL INPUT (ALTINTVAL). A guidance control law parameter, generated by the vertical guidance modes; a reference altitude for reducing steady-state errors in altitude error Ty…
ALTITUDE INTEGRAL LIMIT (INTMAGLIM). A guidance control law parameter, generated by the vertical guidance modes; limits the magnitude of altitude integral value Typical Units: ft; Dimensi…
ATPL Airline Transport Pilot`s License)
AM Amplitude modulation
AMC Acceptable Means of Compliance
AME Aviation Medical Examiner (U.S.)
AMIE AIS Met Information Equipment (Swiss Computer Self Briefing System)
AMLCD Active-matrix liquid crystal display.
AMPHIBIAN An aircraft that can fly off of water or land. The wheels retract into the hull or floats, depending upon the type of aircraft. An amphibian can land …
AMS Aero Medical Services
AMSL Above mean sea level
ANGEL OF ATTACK The difference between pitch and the air-referenced flight path angle; the angle between the aircraft center line and the airspeed vector in the verti…
ANGEL OF ATTACK (AOA) The angle between the chord line of the wing of an aircraft and the relative wind.
ANGLE OF ATTACK The angle that the wing penetrates the air. As the angle of attack increases so does lift, up to a point (and drag).
ANGULAR ACCELERATION Rate of change of angular velocity, either scalar or vector, often with subscripts such as XYZ to denote the coordinate frame; time derivative of angu…
ANGULAR POSITION Amount of rotation about an axis, either scalar or vector, often with subscripts such as XYZ to denote the coordinate frame; time integral of angular …
ANGULAR VELOCITY Rate of change of rotation about an axis, either scalar or vector, often with subscripts such as XYZ to denote the coordinate frame; time derivative o…
ANM ATFM Notification Message
ANNUAL Mandatory inspection of airframe and power plant that occurs every 12 months.
ANNUNCIATOR Any one of warning, caution, or advisory; Synonyms: alert;
ANR Air Navigation Routes
ANS Active Noise System
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 …
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
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.
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.”)
AXIS The line around which a body rotates.
AZIMUTH An angle in the horizontal plane, usually measured with respect to body coordinates