Acronyms and abbreviations in avionics
This is a list of the acronyms and abbreviations used in avionics.
A
- A/A: Air to air TACAN function
- A/P: Autopilot
- AAIM: Aircraft Autonomous Integrity Monitoring
- ABAS: Aircraft-based augmentation system
- AC: Advisory circular
- ACARS: Aircraft communications addressing and reporting system
- ACAS: Airborne collision avoidance system
- ACC: Area control centre
- ACE: Actuator control electronics
- ACMS: Aircraft condition monitoring system
- ACP: Audio control panel
- ACR: Avionic Communication Router
- ACS: Audio control system
- ADAHRS: Air data and attitude and heading reference system
- ADC: Air data computer
- ADF: Automatic direction finder
- ADI: Attitude director indicator
- ADIRS: Air data inertial reference system
- ADIRU: Air data inertial reference unit
- ADM: Air data module
- ADS: Either; automatic dependent surveillance or air data system
- ADS-A: Automatic dependent surveillance – address
- ADS-B: Automatic dependent surveillance – broadcast
- ADS-C: Automatic dependent surveillance – contract
- AESA: Active electronically scanned array
- AFCS: Automatic flight control system
- AFD: Autopilot flight director
- AFDC: Autopilot flight director computer
- AFDS: Autopilot flight director system
- AFDX: Avionics Full-Duplex Switched Ethernet
- AFIS: Either: Automatic flight information service or airborne flight information system
- AGACS: Automatic ground–air communications system, is also known as ATCSS or data link
- AGC: Automatic gain control
- AGDL: Air–ground data link
- AGL: Above Ground Level
- AHC: Attitude heading control
- AHRS: Attitude and heading reference system
- AHRU: Attitude and heading reference unit
- AIDS: Aircraft integrated data system
- AIP: Aeronautical Information Publication
- AIRAC: Aeronautical Information Regulation & Control
- AIXM: Aeronautical information exchange model
- ALC: Automatic level control
- ALT: Either; altimeter or altitude
- ALT hold: Altitude hold mode
- ALTS: Altitude select
- AMLCD: Active-matrix liquid crystal display
- AMO: Approved maintenance organisation
- AMS: Air management system
- ANC: Active noise cancellation
- ANN: Annunciator – caution warning system normally containing visual and audio alerts to the pilot
- ANR: Active noise reduction
- ANT: Antenna
- AOC: Aeronautical operational control
- AOP: Airport operating plan
- APARS: Automatic pressure altitude reporting system
- APIRS: Attitude and positioning inertial reference system
- APOA: Airport of arrival
- APC: Auto pilot computer
- APOD: Airport of departure
- APM: Aircraft personality module
- APS: Auto pilot system
- APU: Auxiliary power unit
- APV: Approach Procedure with Vertical guidance (Instrumental approach)
- ARINC: Aeronautical Radio, Incorporated
- ASD: Aircraft situation display
- ASDL: Aeronautical satellite data link
- ASI: Airspeed indicator
- ASR: Airport surveillance radar
- ASU: Avionics switching unit
- AT: Auto throttle
- ATC: Air traffic control
- ATCC: Air traffic control centre
- ATCT: Airport traffic control tower
- ATCRBS: Air traffic control radar beacon system
- ATCSS: Air traffic control signalling system
- ATIS: Automated terminal information service
- ATR: Air transportable racking
- ATR: Automatic thrust restoration
- ATSAW: Airborne traffic situational awareness
- ATSU: Air traffic services unit
- ATT: Attitude
- ATTCS: Automatic Take-off Thrust Control System
- Avionics: Aviation electronics
- AWOS: Automated weather observation system
- AWACS: Advanced warning and control systems
- ALNA: Airline network architecture
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
K
- KIAS: Knots Indicated airspeed
- KTAS: Knots true airspeed
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
- QAR: Quick Access Recorder
- QNH: Barometric pressure adjusted to sea level
- QRH: Quick Reference Handbook
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
- SAR: Search and Rescue, Smart ACMS Recorder
- SAT: Static air temperature
- SATCOM: Satellite communication
- SATNAV: Satellite navigation
- SD: Secure digital
- SDF: Simplified directional facility
- SDU: Satellite data unit
- SELCAL: Selective calling
- SID: Standard Instrument Departure
- SIU: Satellite interface unit
- SMS: Short Messaging Service
- SNR: Signal-to-noise ratio
- SPKR: Speaker
- SQ or SQL: Squelch
- SRS: Speed Reference System
- 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
- STCA: Short-Term Conflict Alert
- STP: Standard temperature and pressure
- SUA: Special use airspace
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
- UAC: Upper area control
- UART: Universal asynchronous receiver transmitter
- UAV: Unmanned aerial vehicle
- UHF: Ultra-high frequency
- ULB: Underwater locator beacon
- USB: Universal Serial Bus
- UTC: Universal Time Coordinate
V
- V: Volts or voltage
- V/L: VOR/Localizer
- V/NAV: Vertical navigation
- V/R: Voltage regulator
- V/REF: Reference velocity
- V/S: Vertical speed
- V/TRK: Vertical track
- VASI: Visual approach slope indicator
- VASIS: Visual approach slope indicator (system)
- VDF: VHF direction-finding
- VDL: VHF Data Link
- VDR: VHF digital radio
- VFO: Variable frequency oscillator
- VFR: Visual flight rules
- VG/DG: Vertical gyroscope/directional gyroscope
- VGA: Video Graphics Array
- VHF: Very high frequency
- VMC: Visual meteorological conditions or minimum control speed with critical engine out
- VNE: Never exceed speed
- VNO: Maximum structural cruising speed
- VNR: VHF navigation receiver
- VOR: VHF omnidirectional range and ranging
- VOR/DME: VOR with Distance measuring equipment
- VOR/MB: VOR marker beacon
- VORTAC: VOR and TACAN combination
- VOX: Voice transmission
- VPA: Vertical Path Approach
- VPATH: Vertical path
- VRP: Visual point of reference
- VSI: Vertical speed indicator
- VSM: Vertical separation limit
- VSO: Stall speed in landing configuration
- VSWR: Voltage–standing wave ratio
- VX: Speed for best angle of climb
- VY: Speed for best rate of climb
W
- WAAS: Wide Area Augmentation System
- WD: Wind direction
- 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
- WS: Wind shear
- WX: Weather
- WXR: Weather radar system
- WYPT: Waypoint
X
- XCVR: Transceiver
- XFR: Transfer
- XMIT: Transmit
- XMSN: Transmission
- XMTR: Transmitter
- XPDR: Transponder
- XTK: Crosstrack
- X-Start: Cross-start. Use the air pressure or electrical power from a working engine.
Y
- YD: Yaw damper
- Y : YAW
Z
- ZFW: Zero Fuel Weight
References
- "CNS/ATM Systems" (PDF). International Civil Aviation Organization.
- British Aircraft Corporation now British Aerospace
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