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Aviation acronyms and abbreviations

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AAE	Above Airport Elevation
AAIB	Air Accidents Investigation Branch (UK)
ABM	Abeam
ABN, ABNORM	Abnormal
ABS	Absolute
AC	Alternating Current / Advisory Circular
A/C	Air Conditioning / Aircraft
ACARS	ARINC Communications Addressing and Reporting System
ACCEL	Acceleration, Accelerate(d)
ACFT	Aircraft
ACM	Air Cycle Machine
ACMP	Alternating Current Motor Pump / Electric Hydraulic Pump
ACMS	Aircraft Condition and Monitoring System
ACP	Audio Control Panel
ACPT	Accept
ACRU	Air Conditioning Refrigeration Unit
ACT	Active / Activate
ACU	Antenna Coupler Unit
AD	Airworthness Directive
ADC	Air Data Computer
ADF	Automatic Direction Finder
ADG	Air Driven Generator
ADI	Attitude Director Indicator
ADIRS	Air Data Inertial Reference System
ADIRU	Air Data Inertial Reference Unit
ADJ	Adjusted / Adjustment
ADM	Air Data Module
ADP	Air Driven Pump/Air Driven Demand Hydraulic Pump
ADR	Air Data Reference
ADRS	Address
ADJ	Adjusted / Adjustment
ADV	Advisory / Advance / Advanced
AFCS	Avionic Flight Control System
AFDS	Autopilot Flight Director System
AFE	Above Field Elevation
AFM	Airplane Flight Manual
AFS	Autoflight System / Auto flight Simulator
AFTN	Aeronautical Fixed Telecommunications Network
A/G	Air/Ground
AGL	Above Ground Level
AIAA	American Institute of Aeronautics and Astronautics (US)
AIDS	Aircraft Integrated Data System
AIL	Aileron / Autopilot Interlock
AIP	Aeronautical Information Publication
AIREP	Air Report
AIRMET	weather advisory service
AIU	Audio Interface Unit
AL	Alert
ALPA	Air Line Pilots Association
ALPHA	Angle of Attack for a specific configuration
ALRT	Alert
ALS	Autothrottle Limit Switch
ALT	Altitude
ALT HOLD	Altitude Hold
ALTM	Altimeter
ALTN	Alternate
ALT/S	Altitude Select
ALW	Allowable Landing Weight
AM	Amplitude Modulation
AMB	Ambient
AMBG	Ambiguity
AMP(s)	Ampere(s)
AMR	Auto/Manual/Remote
AMU	Audio Management Unit
AND (A.N.D.)	Aircraft Nose Down
ANNUNC	Annunciator
ANT	Antenna
ANU (A.N.U.)	Aircraft Nose Up
AOA	Angle of Attack
AP (A/P)	Auto-Pilot
APB	Auxiliary Power Breaker
APD	Approach Progress Display
APFD(S)	Autopilot Flight Director (System)
APL	Airplane
APP	Approach
APPR	Approach
APPROX	Approximately
APPU	Asymmetry Position Pick-off Unit
APT	Airport
APU	Auxiliary Power Unit
APX	Appendix
AQP	Advanced Qualifications Program
ARFF	Aircraft Rescue and Fire Fighting
ARINC	Aeronautical Radio Incorporated
ARND	Around
ARPT	Airport
ARRVL	Arrival
ARSR	Air route surveillance radar
ARTCC	Air Route Traffic Control Center
AS	Airspeed / Altitude Mode Switch Monitor
A/S	Airspeed
ASA	Autoland Status Annunciator
ASI	Air Speed Indicator
ASMD	Assumed
ASP	Audio Selector Panel
ASAP	As Soon As Possible
ASR	Airport Surveillance Radar
ASRS	Aviation Safety Reporting System
ASSY	Assembly
ASTP	Advanced Simulation Training Program
ASYM	Assymetrical / Asymmetry
A/S	Airspeed
A/SKID	Anti Skid
A/T	Autothrottle
ATA	Actual Time of Arrival / Air Transport Associaton
ATC	Air Traffic Control
ATCRBS	ATC radar beacon system
ATC/DABS	Air Traffic Control/Discrete Address Beacon System
ATE	Automatic Test Equipment
A/THR	Auto Thrust Function
ATIS	Automatic Terminal Information Service
ATM	Air Turbine Machine
ATS	Auto Thrust System / Autothrottle System
ATT	Attitude
ATTND	Attendant
AUG	Augmentation
AUTO	Automatic
AUX	Auxiliary
A/V	Auto-Visual
AVAIL	Available
AVG	Average
AVM	Airborne Vibration Monitor
AVS	Audio Visual System
AWOS	Automated Weather Observation System
AWY	Airway
AZ	Vertical Acceleration
AZIM	Azimuth
AzMKR	Azimuth Marker

BAL	Balance
BARO	Barometric
BAT	Battery
BB	Broadband
B/B	Back Beam
BC	Back Course
BCDS	Bite Centralized Data System
BCK	Back
BCL	Battery Charge Limiter
BCN	Beacon
B/CRS (B CRS)	Back Course
BEV	Beverage
BF	Boarded Fuel
BFE	Buyer Furnished Equipment
BFO	Beat Frequency Oscillator
BIT	Built In Test
BITE	Built In Test Equipment
BIU	Bite Interface Unit
BK	Brake
BKGRD	Background
BKR	Breaker (Circuit Breaker)
BKS	Brakes
BLD	Bleed
BLK	Block
BMC	Bleed Air Monitoring Computer
BMV	Brake Metering Valve
BNR	Binary
BOD	Bottom of Descent
BRF	Brief(ing)
BRG	Bearing
BRK	Brake
BRKNG	Breaking
BRKR(S)	Breaker(s)
BRT	Bright
BS	British Standard
BSCU	Brake System Control Unit
BAY	Busy
BTB(S)	Bus Tie Breaker(s)
BTC	Bus Tie Contactor
BTL	Bottle
BTR	Bus Tie Relay
BTU	British Thermal Unit
B/U	Backup
BUF	Buffet (as in buffet speed)
BUS	Bus Bar

C	Center
ºC	Degrees Centigrade
CAA	Civil Aviation Authority (UK) / Civil Aeronautics Agency (US)
CAP	Capture
CAPT	Captain
CAS	Calibrated Airspeed
CAT	Clear air turbulence
CB(S), C/B	Circuit Breaker(s)
CBMS	Circuit Breaker Monitoring System
CCA	Central Control Actuator
CCW	Counterclockwise
CDL	Configuration Deviation list
CDU	Control Display Unit
CFDIU	Centralized Fault Data Interface Unit
CFDS	Centralized Fault Display System
CFM	Cubic Feet Per Minute
CG	Center Of Gravity
CHAN	Channel
CHG	Change
CHR	Chronograph
CHRGR	Charger
CIDS	Cabin Intercommunication Data System
CIS	Cabin Interphone System
CK	Check
CKT	Circuit
CLB	Climb
C/L	Check List
CL	Close
CLB	Climb
CLK	Clock
CLR	Clear
CLSD	Closed
CMD	Command
CMPTR	Computer
CNX	Cancelled
CO	Company
COMM	Communication
COMP	Compressor
COMP	Compartment
CON	Continous
COND	Condition
CONF	Configuration
CONFIG	Configuration
CONN	Connection
CONT	Control / Continuous
CORR	Correction
CO RTE	Company Route
CP	Control Panel
CPCS	Cabin Pressure Control System
CPCU	Cabin Pressure Controller Unit
CRC	Continuous Repetitive Chime
CRG	Cargo
CRS	Course
CRT	Cathode Ray Tube
CRZ	Cruise
CSCU	Cargo Smoke Control Unit
CSD	Constant Speed Drive
CSEU	Control System Electronic Unit
CSM/G	Constant Speed Motor/Generator
CSTR	Constraint
CTL PNL	Control Panel
CTR	Contour / Center
CU	Control Unit
CVR	Cockpit Voice Recorder
CVRDA	Cockpit Voice Recorder
CW	Clockwise
CWS	Contorl Wheel Steering

DA	Drift Angle
DAR	Digital AIDS Recorder
DC	Direct Current
DCV	Directional Control Valve
DDRMI	Digital distance and Radio Magnetic Indicator
DECEL	Decelerate(d)
DECR	Decrease
DED	Dedicated
DEG	Degree
DEM	Demand
DEPR	Depressurize
DEPT	Departure
DER	Designated Engineering Representative
DES	Descent
DEST	Destination
DET	Detector
DFA	Delayed Flap Approach
DEV	Deviation
DFDAU	Digital Flight Data Acquisition Unit
DFDR	Digital Flight Data Recorder
DGAC	Direction Générale de l'Aviation Civile
DH	Decision Height
DIFF	Differential
DIR	Direct / Direction
DIR TO	Direct To
DISC	Disconnect
DISCH	Discharge
DISCONT	Discontinued
DISP	Dispatch
DIST	Distance
DITS	Digital Information Transfer System
DK	Deck
DMC	Display Management Computer
DME	Distance Measuring Equipment
DMU	Data Management Unit (Aids)
DN	Down
DNTKFX	Down Track Fix
DR	Dead reckoning / Door
DSDL	Dedicated Serial Data Link
DSPL	Display
DTG	Distance To Go
DU	Display Unit

E	East
EADI	Electronic Attitude Director Indicator
EAS	Equivalent Airspeed
EBU	Engine Build-Up
ECAM	Electronic Centralized Aircraft Monitoring Computer / Electronic Control and Maintenance display
ECB	Electronic Control Box (APU)
ECM	Engine Condition Monitoring
ECON	Economic
ECP	ECAM Control Panel
ECS	Environmental Control System
ECU	Engine Control Unit
E/D	End of Descent
EDP	Engine Driven Pump / Engine Primary Hydraulic Pump
E/E	Electrical / Electronic
EEC	Electronic Engine Control
EEL	Emergency Exit Lights / Emergency Escape Path Lighting
EET	Estimated Elapsed Time
EFC	Expect Further Clearance
EFCS	Electronic Flight Control System
EFI	Electronic Fligh Instruments
EFIS	Electronic Flight Instrument System
EFOB	Estimated Fuel On Board
EGT	Exhaust Gas Temperature
EHF	Extremely high frequency
EHSI	Electronic Horizontal Situation Indicator
EICAS	Engine Indication and Crew Alerting System
EIS	Electronic Instruments System
EIU	Engine Interface Unit
EL	Elevator
ELAC	Elevator Aileron Computer
ELCU	Electrical Load Control Unit
ELEC	Electrical / Electrics
ELEV	Elevator
ELF	Extremely low frequency
ELV	Elevation
EMER	Emergency
EMER GEN	Emergency Generator
EMI	Electro-Magnetic Interference
ENG	Engine
ENRT	Enroute
ENT	Enter
ENTMT	Entertainment
ENTR	Enter
EO, E/O	Engine Out
EPE	Estimated Position Error
EPI	Elevator Position Indicator
EPR	Engine Pressure Ratio
EPRL	EPR Limit
EQPT	Equipment
EQUIV	Equivalent
ER	Extended Range
EROPS	Extended Range Operatations
ERR	Error
ESS	Essential
EST	Estimated
ET	Elapsed Time
ETA	Estimated Time of Arrival
ETE	Estimated Time en Route
ETOPS	Extended-Range Twin Engine Operations
ETP	Equal Time Point
ETT	Estimated Takeoff Time
EUROCAE	European Organization for Civil Aviation Electronics
EVAC	Evacuation
EVMU	Engine Vibration Monitoring Unit
E/WD	Engine / Warning Display
EXCD	Exceedances
EXEC	Execute
EXH	Exhaust
EXPED	Expedite
EXT	Extend(ed) / Extension / Exterior / External
EXTEN	Extension
EXT PWR	External Power

F, Fº	Farenheit Degrees
F/A	Flight Attendant
FAA	Federal Aviation Administration
FAC	Flight Augmentation Computer
FACTR	Factor
FADEC	Full Authority Digital Engine Control System
FAF	Final Approach Fix
FAR	Federal Aviation Regulation(s)
FAV	Fan Air Valve
FBW	Fly-by-wire.
F/C	Flight Crew
FCC	Flight Control Computer / Federal Communications Commission
FCDC	Flight Control Data Concentrator
FCST	Forecast
FCU	Flight Control Unit
FD, F/D	Flight Director
FDAU	Flight Data Acquisition Unit
FDIU	Flight Data Interface Unit
FDR	Flight Data Recorder
FDU	Fire Detection Unit
FE	Flight Engineer
FF, F/F	Fuel Flow
FFRATS	Full Flight Regime Autothrottle System
FG	Flight Guidance
FGC	Flight Guidance Computer
FGS	Flight Guidance System
FH	Flight Handbook
FIDDS	Fault Isolation and Detection Display System
FIDS	Fault Isolation and Detection System
FILT	Filter
FIRM	Fault Isolation Reporting Manual
FL	Flight Level
FLCH, FL CH	Flight Level Change
FLIFO	Flight Information
FLP	Flap
FLT	Flight
FLT CTL	Flight Control
FM	Flight Management / Frequency modulation
FMA	Flight Mode Annunciator
FMC	Flight Management Computer
FMCS	Flight Management Computer System
FMECA	Failure Modes Effects and Criticality Analysis
FMGC	Flight Management Guidance Computer
FMGS	Flight Management Guidance System
FMS	Flight Management System
FMU	Fuel Metering Unit
FO	Flyover
F/O	First Officer
FOB	Fuel on Board
FOD	Foreign Object Damage
FOG	Fiber Optics Gyro
FOM	Flight Operations Manual
FOTM	Flight Operations Training Manual
F-PLN	Flight Plan
FPA	Flight Path Angle
FPL	Flight Plan
FPM	Feet Per Minute
FPPU	Feed-Back Position Pick-Off Unit
FPS	Flight Per Second
FPT	Flight Plan Time
FPV	Flight Path Vector
FQ	Fuel Quanity
FQI/FQU	Fuel Quantity Indication / Unit
FR	From
FREQ	Frequency
FRM	Falut Reporting Manual
FRT	Front
FRV	Fuel Return Valve
FS	Flight Safety / Fast Slew
F/S	Fast/Slow (indicator)
FSEU	Flap/Slat Electronic Unit
FSF	Flight Safety Foundation
FSS	Flight Service Station
FT	Foot Feet.
FTA	Fault Tree Analysis
FTM	Flight Training Manual
FT/MN	Feet per Minute
FU	Fuel Used
FWD	Forward
FWC	Flight Warning Computer
FWS	Flight Warning System

G	Gravity (G-Force) / Gyro (flag on ADI)
G/A	Go Around
GA	Go Around
GB	Generator Breaker
GCA	Ground Controlled Approach
GCR	Generator Control Relay
GCU	Generator Control Unit
GE	Genral Electric
GEN	Generator
GFR	Generator Field Relay
GLC	Generator Line Contractor
GLY	Galley
GMT	Greenwich Mean Time
GND	Ground
GP	General Purpose
GPCU	Ground Power Control Unit
GPH	Gallons Per Hour
GPM	Gallons Per Minute
GPS	Global Positioning System (Navstar)
GPU	Ground Power Unit
GPWS	Ground Proximity Warning System
GR	Gear / Generator Relay
GRD	Ground
GRND	Ground
GRP	Geographic Reference Point
GRVTY	Gravity
GS	Ground Speed
G/S	Glide Slope
GSE	Ground support equipment
GTOW	Gross Takeoff Weight
GW	Gross Weight

H	Hour, Hot
HA	Halon fire extenguisher
HCU	Hydraulic Control Unit
HDBK	Handbook
HDG	Heading
HDG/S	Heading Select
HDL	Handle
HDWD	Headwind
HF	High Frequency
HG	Heading
HI	High
HIRF	High Intensity Radiated Field
HLD	Hold / Holding
HMG	Hydraulic Motor Generator
HMU	Hydro-Mechanical Unit
HOL	High-Order Language
HOT	High Oil Temperature
HP	High Pressure
HPA	Hectopascals
HPV	High Pressure Valve
HR	Hour
HSI	Horizontal Situation Indicator
HT	Height / Heat
HTR	Heater
HUD	Head Up Display
HUMID	Humidifier
H/Wind	Headwind
HYD	Hydraulics
HZ	Hertz (cycles per second in alternating current)

IAF	Initial Approach Fix
IAS	Indicated Airspeed
IATA	International Air Transport Association
IAW	In Accordance With
I/C	Inspection/Check
ICAO	International Civil Aviation Organization
ICU	Instrument Comparator Unit / Indicator Control Unit
IDENT	Identification
IDG	Integrated Drive Generator
IDS	Integrated Display System
IDU	Interactive Display Unit
I.E.	That Is
IFR	Instrument Flight Rules
IGN	Ignition
ILLUM	Illuminate / Illuminated
ILS	Instrument Landing System
IMBAL	Imbalance
IMC	Instrument Meterorological Conditions
IMM	Immediate
IMP	Imperial
IN	Inch(es)
INB	Inbound
INBD	Inboard
INBO	Inboard
INBRD	Inboard
INC	Incorporated
INCR	Increase
INCREM	Increment
IND	Indicator
INFLT	Inflight
INHB	Inhibit
INIT	Initialization / Initialize
INOP	Inoperative
INPH	Interphone
INR	Inner
INS	Inertial Reference System
INST(S)	Instrument(s)
INSTR	Instrument
INT	Interphone / Initialization / Intensity
INTC	Intercept
INTCP	Intercept
INTPH	Interphone
INV	Inverter
I/O	Input/Output
IOE	Initial Operating Experience
IP	Intermediate Pressure/Input/Intercept Profile/Initial Point
IPC	Intermediate Pressure Check valve
IPPU	Instrumentation Position Pick-off Unit
IR	Infrared / Infrared Radiation
IRS	Inertial Reference System
IRU	Inertial Reference Unit
ISA	International Standard Atmosphere
ISB	Inter-System Bus
ISDU	Inertial Sensor Display Unit
ISLN	Isolation
ISOL	Isolate / Isolated / Isolation (valve)
IVSI	Instantaneous Vertical Speed Indicator
IV&V	Independent Validation and Verification

JAA	Joint Aviation Authorities
JAR	Joint Aviation Regulations
JEPP	Jeppeson
JETT	Jettison
JP(4), (5)	Military Jet Fuel

K,KT,KTS

Knots</