A

B

  • B RNAV: Basic Area Navigation.
  • BARO: Barometric indication, setting or pressure.
  • BCRS: Back Course.
  • BDI: Bearing Distance Indicator.
  • BGAN: Broadcast Global Area Network.

C

  • CAI: Caution Annunciator Indicator.
  • CAT I: Operational performance Category 1.
  • CAT I Enhanced. Allows for lower minimums than CAT I in some cases to CAT 2 minimums.
  • CAT II: Operational performance Category II.
  • CAT IIIa: Operational performance Category IIIa.
  • CAT IIIb: Operational performance Category IIIb.
  • CAT IIIc: Operational performance Category IIIc.
  • CODEC: Coder/Decoder.
  • CDI: Course Deviation Indicator.
  • CFIT: Controlled Flight Into Terrain.
  • COMM or COM: Communications Receiver.
  • CNS: Communication, Navigation, Surveillance.
  • CNS/ATM: Communication, Navigation, Surveillance/Air Traffic Management.
  • CPDLC: Controller-Pilot Data Link Communication.
  • CPS: Cycles Per Second.
  • CRT: Cathode Ray Tube.
  • CTAF: Common Traffic Advisory Frequency.
  • CV/DFDR: Cockpit Voice and Digital Flight Recorder.
  • CVR: Cockpit Voice Recorder.
  • CWS: Control Wheel Steering.

D

E

F

  • FADEC: Full Authority Digital Engine Control.
  • FAF: Final Approach Fix.
  • FAP: Final Approach Point.
  • FAT: Free Air Temperature.
  • FDRS: Flight Data Recorder System.
  • FDU: Flux Detector Unit.
  • FF: Fuel Flow.
  • FIS-B: Flight Information Services- Broadcast.
  • FLIR: Forward Looking Infra-Red.
  • FLTA: Forward Looking Terrain Avoidance.
  • FMC: Flight Management Computer.
  • FMS: Flight Management System.
  • FREQ: Frequency.
  • FYDS: Flight director/ Yaw Damper System.

G

H

I

  • IAF: Initial Approach Fix.
  • IAS: Indicated Airspeed.
  • ID: Identify/Identification or identifier.
  • IDENT: Identify/Identifier.
  • IDS: Information Display System or Integrated Display System.
  • IF: Intermediate Fix.
  • IFE: In-Flight Entertainment.
  • IFR: Instrument Flight Regulations.
  • ILS: Instrument Landing System.
  • IMC: Instrument Meteorological Conditions.
  • InHg: Inches of Mercury.
  • IND: Indicator.
  • ISA: International Standard Atmosphere.
  • ISP: Integrated Switching Panel.
  • ITT: Interstage Turbine Temperature.
  • IVSI: Instantaneous Vertical Speed Indicator.

L

  • LAAS: Local Area Augmentation System.
  • LADGPS: Local Area Differential GPS.
  • LCD: Liquid Crystal Display.
  • LCL: Local Time.
  • LDGPS: Local area Differential Global Positioning Satellite.
  • LED: Light Emitting Diode.
  • LMM: Locator Middle Marker.
  • LOC: Localizer.
  • LOM: Locator Outer Marker.
  • LRU: Line Replaceable Unit

M

  • MAP: Manifold Absolute Pressure.
  • MAP't: Missed Approach Point.
  • MB: Marker Beacon.
  • MCBF: Mean Cycles Between Failures.
  • MCDU: Multipurpose Control Display Unit.
  • MDA: Minimum Decent Altitude.
  • MDA/H: Minimum Decision Altitude/Height.
  • MEL: Minimum Equipment List.
  • MF: Medium Frequency.
  • MFD: Multi-Function Display.
  • MFDS: Multi-Function Display System.
  • MHA: Minimum Holding Altitude.
  • MIC: Microphone.
  • MILSPEC: Military Specification.
  • MKR: Marker Beacon or Marker.
  • MLS: Microwave Landing System.
  • MMD: Moving Map Display.
  • MOA: Military Operations Area.
  • Mode A: Transponder pulse code reporting.
  • Mode C: Transponder code and altitude reporting.
  • Mode S: Transponder code, altitude, and TCAS reporting.
  • MSA: Minimum Safe Altitude / Minimum Sector Altitude
  • MSG: Message.
  • MSP: Modes S Specific Protocol.
  • MSSS: Mode S Specific Services.
  • MTBF: Mean Time Between Failures.
  • MTTF: Mean Time To Failure.

N

  • NAS: National Airspace System.
  • NAV: Navigation receiver.
  • Navaid: Navigational Aid.
  • NAVCOMM: Navigation and Communications equipment or receiver.
  • NAVSTAR-GPS: The formal name for the space-borne or satellite navigation system.
  • NCATT: National Center for Aircraft Technician Training.
  • ND: Navigation Display.
  • NDB: Non-Directional radio Beacon.
  • NFF: No Fault Found.
  • NM or NMI: Nautical Mile.
  • NPA: Non-Precision Approach.

O

  • OAT: Outside Air Temperature.
  • OBS: OmniBearing Selector.
  • OM: Outer Marker.

P

R

  • RAI: Radio Altimeter Indicator.
  • RAIM: Receiver Autonomous Integrity Monitoring.
  • RALT: Radar or Radio Altimeter.
  • RCR: Reverse Current Relay.
  • RCVR: Receiver.
  • RDMI: Radio Distance Magnetic Indicator.
  • RDP: Radar Data Processing system.
  • RDR: Radar.
  • REF: Reference.
  • REL: Relative.
  • RF: Radio Frequency.
  • RFI: Radio Frequency Interference.
  • RHSM: Reduced Horizontal Separation Minimal.
  • RLG: Ring Laser Gyroscope.
  • RLY: Relay.
  • RMI: Radio Magnetic Indicator.
  • R-NAV: Area Navigation.
  • RNG: Range.
  • RNP: Required Navigation Performance.
  • ROC: Rate Of Climb.
  • ROD: Rate Of Descent.
  • RPM: Revolutions Per Minute.
  • RTE: Route.
  • RVR: Runway Visual Range.
  • RVSM: Reduced Vertical Separation Minimum.
  • RX: Receiver.

S

  • SAT: Static Air Temperature.
  • SATCOM: Satellite Communication.
  • SATNAV: Satellite Navigation.
  • SD: Secure Digital.
  • SID: Standard Instrument Departure.
  • SIU: Satellite Interface Unit.
  • SL: Sensitivity Level.
  • SMS: Short Messaging Service.
  • SNR: Signal to Noise Ratio.
  • SPKR: Speaker.
  • SQ or SQL: Squelch.
  • SSCV/DR: Solid State Cockpit Voice/Data Recorder.
  • SSCVR: Solid State Cockpit Voice Recorder.
  • SSFDR: Solid State Flight Data Recorder.
  • SSR: Secondary Surveillance Radar.
  • STAR: Standard Terminal Arrival Route.
  • STARS: Standard Terminal Automation Replacement System.
  • STC: Supplemental Type Certificate.
  • STP: Standard Temperature and Pressure.
  • SUA: Special Use Airspace.

T

  • TA: Traffic Advisory (TCAS).
  • TACAN: Tactical Air Navigation system.
  • Tach: Tachometer.
  • TAD: Terrain Awareness Display.
  • TAF: Terminal Area Forecast.
  • TAS: True Airspeed.
  • TAT: True Air Temperature or Total Air Temperature.
  • TAWS: Terrain Awareness Warning System.
  • TBO: Time Before Overhaul or Time Between Overhaul.
  • TCA: Throttle Control Assembly or Terminal Control Area.
  • TCAS: Traffic Collision Alert and avoidance System.
  • TCF: Terrain Clearance Floor.
  • TCN: TACAN
  • TCU: TACAN Control Unit.
  • TDOP: Time Dilution Of Precision.
  • TDR: Transponder (in some cases).
  • TERPS: Terminal Instrument Procedures or Terminal EnRoute Procedures.
  • TFR: Temporary Flight Restrictions.
  • TFT: Thin Film Transistor.
  • TGT: Turbine Gas Temperature or Target.
  • THDG: True Heading.
  • TIAS: True Indicated Airspeed.
  • TIS: Traffic Information Service.
  • TK: Track Angle.
  • TKE: Track Angle Error.
  • TOT: Turbine Outlet Temperature.
  • TR or T/R: Transmitter Receiver or transceiver.
  • TRACON: Terminal Radar Approach Control.
  • TRANS: Transmit, Transmission, or Transition.
  • TRK: Track.
  • TRP: Mode S Transponder.
  • TTR: TCAS II Transmitter/Receiver.
  • TTS: Time to Station.
  • TVE: Total Vertical Error.
  • TWDL: Two-Way Data Link, or Terminal Weather Data Link.
  • TWDR: Terminal Doppler Weather Radar.
  • TWIP: Terminal Weather Information for Pilots.
  • TWR: Terminal Weather Radar.
  • TX: Transmit.

U

  • UART: Universal Asynchronous Receiver Transmitter.
  • UHF: Ultra-High Frequency.
  • ULB: Underwater Locator Beacon.
  • USB: Universal Serial Bus.
  • UTC: Universal Time Coordinate.

V

  • [V]: Volts or voltage.
  • VASI: Visual Approach Slope Indicator.
  • VDL: VHF Data Link.
  • VDR: VHF Digital Radio.
  • VFO: Variable Frequency Oscillator.
  • VFR: Visual Flight Regulations.
  • VG/DG: Vertical Gyroscope/Directional Gyroscope.
  • VGA: Video Graphics Array.
  • VHF: Very High Frequency.
  • V/L: VOR/Localizer.
  • VMC: Visual Meteorological Conditions or minimum control speed with critical engine out.
  • V/NAV: Vertical Navigation.
  • VNE: never exceed speed.
  • VNO: maximum structural cruising speed.
  • VNR: VHF Navigation Receiver.
  • VOR: VHF Omnidirectional Radio and Ranging.
  • VOR/DME: VOR with Distance Measuring Equipment.
  • VOR/MB: VOR Marker Beacon.
  • VORTAC: VOR and TACAN combination.
  • VOX: Voice Transmission.
  • VPATH: Vertical Path.
  • V/R: Voltage Regulator.
  • V/REF: Reference Velocity.
  • V/S: Vertical Speed.
  • VSI: Vertical Speed Indicator.
  • VSM: Vertical Separation Limit.
  • VSO: stall speed in landing configuration.
  • VSWR: Voltage Standing Wave Ratio.
  • V/TRK: Vertical Track.
  • VX: speed for best angle of climb.
  • VY: speed for best rate of climb.

W

  • WAAS: Wide Area Augmentation System.
  • WD/WINDR: Wind Direction.
  • WMA: WXR Waveguide Adapter.
  • WMI: WXR Indicator Mount.
  • WMS: Wide area Master Station.
  • WMSC: Weather Message Switching Center.
  • WMSCR: Weather Message Switching Center Replacement.
  • WPT: Waypoint.
  • WRT: WXR Receiver Transmitter.
  • WX: Weather.
  • WXR: Weather Radar System.
  • WYPT: Waypoint.

X

Y

  • YD: Yaw Damper.