Engineering:Acronyms and abbreviations in avionics

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This is a list of the acronyms and abbreviations used in avionics.

A

B

  • B RNAV: Basic area navigation
  • BARO: Barometric indication, setting or pressure
  • baro-VNAV: Barometric vertical navigation
  • BITE: Built-in test equipment
  • BCRS: Back course
  • BDI: Bearing distance indicator
  • BGAN: Broadcast Global Area Network
  • BER: Beyond economic repair
  • BTV: Brake to Vacate

C

  • C/L: Centre line
  • CAA: Civil Aviation Authority
  • CACTCS: Cabin Air Conditioning and Temperature Control System (pronounced "Cactus")
  • CAI: Caution advisory panel (sometimes spelled "caution-advisory" or "caution/advisory")
  • CAS: Calibrated airspeed
  • CAM: Cockpit area microphone (part of the cockpit voice recorder)
  • 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
  • CB: Cumulonimbus cloud
  • CBT: Computer-based training
  • CDA: Continuous descent approach
  • CDCCL: Critical Design Configuration Control Limitations
  • CDI: Course deviation indicator
  • CDTI: Cockpit display of traffic information
  • CFIT: Controlled flight into terrain
  • CHP: Course Heading Panel
  • CHT: Cylinder Head Temperature
  • CMU: Communications Management Unit
  • CNS: Communication, navigation and surveillance
  • CNS/ATM: Communication, navigation and surveillance / Air traffic management[1]
  • CODEC: Coder/decoder
  • COMM or COM: Communications transceiver, Communications receiver, or Communications radio transmitter (now, normally: either VHF or UHF; HF communications avionics are usually abbreviated simply HF)
  • COTS: Commercial off-the-shelf
  • CPA: Closest point of approach
  • CPDLC: Controller–pilot data link communications
  • CPS: Cycles per second
  • CRM: Crew Resource Management
  • CRT: Cathode ray tube
  • CTAF: Common traffic advisory frequency
  • CV/DFDR: Cockpit voice and digital flight data recorder
  • CVR: Cockpit voice recorder
  • CWS: Control wheel steering

D

  • DA: Decision Altitude (Precision approach or vertical guidance)
  • DA: Drift angle
  • DAPs: Downlink of aircraft parameters
  • DCDU: Data link control and display unit
  • DCL: Departure Clearance via CPDLC
  • DCP: Display control panel
  • DFDR: Digital Flight Data Recorder
  • DFMC: Dual Frequency Multiple Constellation
  • DG: Directional gyroscope
  • DGPS: Differential global positioning system
  • DH: Decision height (Precision approach, referred to threshold elevation)
  • DLR: Data link recorder
  • DME: Distance measuring equipment
  • DNC: Direct noise canceling
  • DP: Departure procedures
  • DPU: Display Processor Unit
  • DSP: Digital signal processing
  • DTU: Data transfer unit
  • DUAT: Direct user access terminal
  • DVE: Degraded Visual Environment
  • DRMC : Direct Reading Magnetic Compass .

E

  • EADI: Electronic attitude director indicator
  • ECAM: Electronic Centralised Aircraft Monitor
  • ECU: Engine Control Unit (=EEC)
  • EEC: Electronic Engine Control
  • EFD: Electronic flight display
  • EFIS: Electronic flight instrument system
  • EGI: Embedded GPS Inertial
  • EGNOS: European Geostationary Navigation Overlay Service
  • EGPWS: Enhanced ground proximity warning system
  • EGT: Exhaust gas temperature
  • EHS: Enhanced surveillance
  • EHSI: Electronic horizontal situation indicator
  • EICAS: Engine indication crew alerting system
  • EIS: Electronic Instrument System
  • ELT: Emergency locator transmitter
  • ENC: Electronic noise canceling
  • ENG: Engine
  • ENR: Electronic noise reduction
  • EPR: Engine pressure ratio
  • EPU: Emergency Power Unit
  • ERAM: En Route Automation Modernization
  • ETOP(S): Extended-range twin-engine operation(s)

F

  • FAA: Federal Aviation Administration
  • FADEC: Full authority digital engine control
  • FAF: Final approach fix
  • FANS: Future Air Navigation System
  • FAS: Final Approach Segment
  • FAT: Free air temperature
  • FATO: Final Approach and Take-off Area
  • FBO: Fixed Base Operator
  • FBW: Fly-by-wire
  • FCC: Flight Control Computer
  • FCMC: Fuel Control & Monitoring Computer
  • FCS: Flight Control System
  • FD: Flight Director
  • FDAU: Flight-data acquisition unit
  • FDPS: Flight plan Data Processing System
  • FDR: Flight Data Recorder
  • FDRS: Flight data recorder system
  • FDU: Flux detector unit
  • FF: Fuel flow
  • FG: Flight Guidance
  • FIC: Flight Information Centre
  • FIKI: Flight Into Known Ice
  • FIS-B: Flight information services – broadcast
  • FL: Flight Level
  • FLIR: Forward-looking infra-red
  • FLTA: Forward-looking terrain avoidance
  • FMA: Flight Mode Annunciator
  • FMGS: Flight Management & Guidance System
  • FMS: Flight management system
  • FOB: Fuel On-Board
  • FOD: Foreign object damage
  • FQIS: Fuel Quantity Indication System
  • FREQ: Frequency
  • FSS: Flight service station
  • FWS: Flight warning system
  • FYDS: Flight director/ Yaw damper system

G

  • GA: General Aviation
  • GAST: GBAS Approach Service Type
  • GBAS: Ground based augmentation system
  • GCAS: Ground collision avoidance system
  • GCU: Generator control unit
  • GDOP: Geometric dilution of precision
  • GGS: Global positioning system ground station
  • GHz: Gigahertz
  • GLNS: GPS Landing and Navigation System
  • GLNU: GPS landing and navigation unit
  • GLONASS: Global Navigation Satellite System
  • GLS: GBAS Landing System
  • GLU: GPS landing unit
  • GMT: Greenwich Mean Time
  • GND: Ground
  • GNSS: Global Navigation Satellite System
  • GO: Go Around
  • GPS: Global Positioning System
  • GPWC: Ground proximity warning computer
  • GPWS: Ground proximity warning system
  • G/S: Glide Slope
  • GS: Ground speed

H

  • "Hg: Symbol for unit of pressure, Inch of Mercury
  • HDG: Heading
  • HDG SEL: Heading select
  • HDOP: Horizontal dilution of precision
  • HF: High frequency
  • HHLD: Heading hold
  • HIRF: High intensity radiated field
  • HMD: Helmet-mounted display
  • HPR: High Pressure Rotor
  • HSD: High-speed data
  • HSI: Horizontal situation indicator
  • HSL: Heading select
  • HUMS: Health and usage monitoring systems
  • HUD: Head-up display
  • Hz: Symbol for unit of frequency, Hertz

I

  • IAF: Initial Approach Fix (Instrumental Approach)
  • IAP: Instrument approach procedure
  • IAS: Indicated airspeed
  • IAS: Intermediate Approach Segment (Instrumental Approach)
  • ID: Identify/Identification or identifier
  • IDENT: Identify/identifier
  • IDS: Information display system or integrated display system
  • IF: Intermediate Fix (Instrumental approach)
  • IFE: In-flight entertainment
  • IFF: Identification Friend or Foe
  • IFICS: Integrated Flight Instrument and Control System[2]
  • IFR: Instrument Flight Rules
  • ILS: Instrument landing system
  • IMC: Instrument meteorological conditions
  • IND: Indicator
  • InHg: Inch of Mercury
  • INS: Inertial Navigation System
  • IRS: Inertial Reference System
  • IRU: Inertial reference unit
  • ISA: International Standard Atmosphere
  • ISP: Integrated switching panel
  • ISIS: Integrated standby instrument system
  • ITT: Interstage turbine temperature
  • IVSI: Instantaneous vertical speed indicator

J

  • JTIDS: Joint Tactical Information Distribution System

K

L

  • LAAS: Local Area Augmentation System
  • LADGPS: Local Area Differential GPS
  • LCD: Liquid crystal display
  • LDGPS: Local area differential global positioning satellite
  • LED: Light-emitting diode
  • LMM: Locator middle marker
  • LOC: Localizer
  • LOM: Locator outer marker
  • LOPA: Location of Passenger Accommodations
  • LORAN: Long-range navigation
  • LPR: Low Pressure Rotor
  • LPV: Localizer performance with vertical guidance
  • LRU: Line-replaceable unit
  • LTE: Loss of Tail Rotor Effectiveness Helicopters
  • LVP: Low visibility procedures, a designated state of operations at aerodromes where instrument approaches and low visibility takeoff procedures are using during inclement weather
  • LX: Lightning

M

  • MAP: Manifold absolute pressure or missed approach point
  • MAPS: Minimum Aviation Performance Standards
  • MAHF: Missed Approach Holding Fix (used in RNAV)
  • MAPt: Missed Approach Point (Instrument approach)
  • MAP: Missed Approach Procedure
  • MB: Marker beacon
  • MCBF: Mean cycles between failures
  • MCDU: Multi-purpose/Multi-function Control and Display Unit
  • MDA: Minimum Descent Altitude (non-precision approach)
  • MDH: Minimum Descent Height (non-precision approach)
  • MEA: Minimum en-route altitude
  • MEL: Minimum equipment list
  • METAR: Meteorological Aerodrome Report
  • MCP: Mode control panel
  • MF: Medium frequency
  • MFD: Multi-function display
  • MFDS: Multi-function display system
  • MIC: Microphone
  • MIDS: Multifunctional information distribution system
  • MILSPEC: Military specification
  • MKP: Multi-function Keypad
  • MKR: Marker beacon
  • MLS: Microwave landing system
  • MM: Middle marker
  • MMD: Moving map display
  • MNPS: Minimum navigation performance specifications
  • 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
  • MOPS: Minimum Operational Performance Standard
  • MORA: Minimum Off Route Altitude
  • MOSArt: Modular Open System Architecture
  • MPU: Multifunction Processor Unit
  • MSA: Minimum safe altitude
  • MSD: Minimum Stabilization Distance
  • MSG: Message
  • MSP: Modes S-Specific Protocol
  • MSSS: Mode S-Specific Services
  • MTBF: Mean time between failures
  • MTBUR: Mean time between unscheduled removals
  • MTTF: Mean time to failure
  • MVA: Minimum vectoring altitude
  • MVFR: Marginal visual flight rules
  • MZFW: Maximum Zero Fuel Weight

N

  • N1: Low Pressure rotor (spool) speed (see Jet engine)
  • N2: High Pressure rotor (spool) speed (see Jet engine)
  • NAS: National Airspace System
  • NAV: Navigation receiver (normally VHF navigation receiver for VOR system.)
  • Navaid: Navigational aid
  • NAVCOMM, NAV/COM or NAV-COM: Combination navigation and communications equipment (normally VHF navigation receiver integrated with VHF communications transceiver).
  • NAVSTAR-GPS: NAVigation Satellite Timing And Ranging (The formal name for the space-borne or satellite navigation system)
  • NCAT: National Center for Aviation Training
  • NCATT: National Center for Aircraft Technician Training
  • ND: Navigation display
  • NDB: Non-directional radio beacon
  • NFF: No fault found
  • NGS: Nitrogen Generation System, found in aircraft to reduce fire risk in fuel tanks.
  • NHA: Next Higher Assembly.
  • NM or NMI: Nautical mile
  • NORDO: No radio
  • NoTAM: Notice to Airmen
  • NOZ: Normal Operating Zone (Parallel runways operation)
  • NPA: Non-precision approach (Instrumental approach)
  • NVD: Night vision device
  • NVG: Night vision goggles
  • NTSB: National Transportation Safety Board
  • NTZ: No-Transgression Zone (Parallel runways operation)

O

  • OAS: Obstacle Assessment Surface
  • OAT: Outside air temperature
  • OBI: Omnibearing indicator (see CDI)
  • OBS: Omnibearing selector
  • OCC: Operations control center
  • OCH: Obstacle Clearance Height
  • OFZ: Obstacle Free Zone
  • OIS: Obstacle Identification Surface (Instrumental procedures)
  • OIS: Operational Information System
  • OM: Outer marker
  • OWE/OEW: Operating Weight Empty/Operating empty weight

P

  • PA: Public address system
  • PAEW: Personnel and equipment working
  • PAL: Pilot Activated Lighting
  • PAPI: Precision approach path indicator
  • PAR: Precision approach radar
  • PCL: Pilot Controlled Lighting
  • P-Code: GPS precision code
  • PD: Profile descent
  • PDC: Pre-Departure Clearance
  • PDOP: Position dilution of precision
  • PESA: Passive electronically scanned array
  • PFD: Primary flight display or primary flight director
  • PMG: Permanent magnet generator
  • PND: Primary navigation display
  • PNR: Passive noise reduction
  • POF: Phase of flight
  • POH: Pilot's Operating Handbook
  • POS: Position
  • P-RNAV: precision area navigation
  • PRA: Pre-recorded announcement
  • PSR: Primary surveillance radar
  • PSU: Passenger service unit
  • PTT: Push-to-talk

Q

R

  • RA: Resolution advisory (TCAS)
  • RAAS: Runway Awareness and Advisory System
  • Rad Alt: Radio Altitude
  • Radar: RAdio Detection And Ranging
  • RAI: Radio altimeter indicator
  • RAIM: Receiver-autonomous integrity monitoring, also remote autonomous integrity monitoring
  • RALT: Radar or radio altimeter
  • RAT: Ram air turbine
  • RCR: Reverse current relay
  • RCVR: Receiver
  • RDH: Reference Datum Height
  • RDMI: Radio distance magnetic indicator
  • RDP: Radar data processing system
  • RDR: Radar
  • REF: Reference
  • REIL: Runway end identifier lights
  • REL: Relative
  • RF: Radio frequency
  • RFI: Radio frequency interference
  • RHSM: Reduced horizontal separation minimal
  • RLG: Ring laser gyroscope
  • RLY: Relay
  • RMI: Radio magnetic indicator
  • RNAV: Area navigation
  • RNG: Range
  • RNP: Required Navigation Performance
  • ROC: Rate Of Climb
  • ROD: Rate Of Descent
  • RPA: Remotely Piloted Aircraft (Unmanned aerial vehicle)
  • RPAS: Remotely Piloted Aircraft System
  • RPM: Revolutions per minute
  • RSP: Reversion switch panel
  • RTE: Route
  • RTO: Rejected takeoff
  • RVR: Runway visual range
  • RVSM: Reduced vertical separation minimum
  • RX: Receiver

S

T

  • TA: Traffic advisory (see TCAS)
  • TAA: Terminal Arrival Altitude
  • 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 and warning system
  • TBO: Time before overhaul, or time between overhaul
  • TCA: Throttle control assembly, or terminal control area
  • TCAS: Traffic collision 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 en route procedures
  • TFR: Temporary flight restrictions
  • TFT: Thin-film transistor
  • TGT: Turbine gas temperature, or target
  • THR: Threshold
  • THDG: True heading
  • TIS: Traffic information service
  • TIT: Turbine inlet temperature
  • TK: Track angle
  • TKE: Track-angle error
  • TLA: Thrust lever angle
  • TLA: Three-letter acronym
  • TOC: Top of climb
  • TOD: Top of descent point
  • TOGA or TO/GA: Takeoff/go-around switch, takeoff/go-around thrust
  • TOT: Turbine outlet temperature
  • TR or T/R: Transmitter receiver or transceiver
  • T/R: Thrust reverser or tail rotor
  • TRACON: Terminal radar approach control
  • TRANS: Transmit, transmission, or transition
  • TRK: Track
  • TRP: Mode S transponder
  • TTL: Tuned to Localizer
  • 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
  • Twr: Tower (aerodrome control)
  • TX: Transmit

U

V

W

X

Y

  • YD: Yaw damper
  • Y : YAW

Z

  • ZFW: Zero Fuel Weight

See also

References

  1. ↑ "CNS/ATM Systems". https://www.icao.int/Meetings/AMC/MA/1998/rio/EXECSUM.pdf. 
  2. ↑ British Aircraft Corporation now British Aerospace




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