Search 3,800+ Aviation Terms & Definitions

Term	Definition
VFR	Visual Flight Rules Read More
VMC	Visual Meteorological Conditions Read More
SVFR	Special Visual Flight Rules Read More
MVFR	Marginal Visual Flight Rules Read More
LIFR	Low Instrument Flight Rules Read More
IFR	Instrument Flight Rules Read More
IMC	Instrument Meteorological Conditions Read More
A&E	Architecture and Engineering
A/C	Aircraft
A/G	Air to Ground
A/H	Altitude/Height
AAA	Airport Airspace Analysis
AADC	Airport Average Daily Capacity
AAE	Above Aerodrome Elevation
AAF	Army Air Field
AAI	Arrival Aircraft Interval
AAM	Office of Aerospace Medicine
AAMS	Aircraft Arrival Management System
AAP	Advanced Automation Program
AAR	Airport Arrival Rate
AAS	Advanced Automation System
AASR	Aging Aircraft Safety Rule
ABDIS	Automated Data Interchange System Service
ACAIS	Air Carrier Activity Information System
ACARS	Aircraft Communications Addressing and Reporting System Read More
ACAS	Aircraft Collision Avoidance System
ACID	Aircraft Identification
ACLS	Automatic Carrier Landing System
ACLT	Actual Landing Time Calculated
ACS	Airman Certification Standards
AD	Airworthiness Directive
ADA	Air Defense Area
ADAS	Automated Weather Observing System Data Acquisition System
ADCCP	Advanced Data Communications Control Procedure
ADDA	Administrative Data
ADDS	Aviation Digital Data Service
ADF	Automatic Direction Finder Read More
ADI	Automatic De-Ice and Inhibitor
ADIZ	Air Defense Identification Zone
ADL	Aeronautical Data Link
ADLY	Arrival Delay
ADM	Aeronautical Decision Making
ADS	Automatic Dependent Surveillance
ADS-B	Automatic Dependent Surveillance-Broadcast Read More
ADSY	Administrative Equipment Systems
ADTN	Administrative Data Transmission Network
AED	Automated External Defibrillator
AF	Air Force
AFB	Air Force Base
AFER	Aircraft Fuel Expense Reconciliation System
AFIS	Aerodrome Flight Information Service
AFMS	Automatic Flight Management System
AFP	Area Flight Plan
AFSS	Automated Flight Service Station
AGL	Above Ground Level
AICS	Aircraft Inventory and Charter System
AID	Airport Information Desk
AILS	Automatic Instrument Landing System
AIM	Aeronautical Information Manual
AIP	Aeronautical Information Publication
AIRMET	Airmen’s Meteorological Information
AIRNAV	Airports and Navigation Aids Database System
AIS	Aeronautical Information Service
AIT	Information Technology Service
AITS	Automated Inventory Tracking System
ALP	Airport Layout Plan
ATP	Airline Transport Pilot
ATPL	Airline Transport Pilot Licence
ALPA	Airlines Pilots Association
ALS	Approach Lighting System
ALSF	Approach Lighting System With Sequenced Flashing Lights
ALTRV	Altitude Reservation
AMASS	Airport Movement Area Safety System
AMIS	Aircraft Management Information System
AMS	Airport Management System
AMT	Aviation Maintenance Technician
ANSP	Air Navigation Service Providers
AOA	Angle of Attack
AOI	Angle of Incidence
AOPA	Aircraft Owners and Pilots Association
APM	Approach Path Monitor
APP	Approach
ARFF	Aircraft Rescue and Fire Fighting
ARP	Airport Reference Point
A&P	Airframe and Powerplant
ASD	Aircraft Situation Display
ASDA	Accelerate Stop Distance Available
ASI	Air Speed Indicator
AI	Attitude Indicator
ASR	Airport Surveillance Radar
AT	Air Traffic
ATAS	Airspace and Traffic Advisory Service
ATC	Air Traffic Control
ATCALS	Air Traffic Control and Landing Systems
ATCO	Air Taxi Commercial Operator
ATCRB	Air Traffic Control Radar Beacon
ATCT	Airport Traffic Control Tower
ATIS	Automatic Terminal Information Service Read More
ATM	Air Traffic Manager
ATO	Approved Training Organisation
ATOMS	Air Traffic Operations Management System
ATS	Air Traffic Services
AWACS	Airborne Warning and Control System
AWC	Aviation Weather Center
AWSS	Automated Weather Sensors System
B/cl	Business class
B/CRS	Back Course
BA	Breaking Action
BAG	Baggage
BARO	Barometric
BASE	Cloud Base
BCA	Border Crossing Authority
BCAS	Beacon-based Collision Avoidance System
BCL	Battery Charge Limiter
BCMG	Becoming (Meteorology)
BCMT	Beginning of Civil morning twilight
BCN	Beacon
BCST	Broadcast
BDRY	Boundary
BEW	Basic Empty Weight
BFD	Basic Flight Data message
BFDK	Before dark (Meteorology)
BFR	Before (Meteorology)
BGNG	Beginning (Meteorology)
BHR	Block Hours
BIDS	Baggage Information Display Systems
BINOVC	Breaks in overcast (Meteorology)
BIRDTAM	NOTAM on Bird Activity
BKN	Broken 5-7 octas cloud cover (Meteorology)
BL	Blowing (Meteorology)
BLDU	Blowing Dust (Meteorology)
BLZD	Blizzard (Meteorology)
BR	Mist (Meteorology)
BRF	Brief (Meteorology)
BRG	Bearing
BTH	Beyond the Horizon
BVOR	Broadcast VOR
BVR	Beyond Visual Range
BW	Basic Weight
BYD	Beyond (Meteorology)
BYDU	Back-Up Yaw Damper Unit
CAA	Civil Aviation Authority
CAT	Category / Clear Air Turbulence
CAVOK	Ceiling and Visibility OK
CB	Cumulonimbus
CC	Cirrocumulus
CDN	Coordination
CF	Course to a fix
CFM	Confirm
CGL	Circling Guidance Light
CH	Channel
CHEM	Chemical
CI	Cirrus
CIV	Civil
CK	Check
CL	Centre line
CLA	Clear type of ice formation
CLD	Cloud
CLR	Clear / Cleared
CLSD	Close / Closed
CM	Centimetre
CMB	Climb
CMPL	Completed
CNS	Communications, Navigation and Surveillance
COM	Communications
CONC	Concrete
COND	Condition
CONS	Continuous
COOR	Coordinate
COP	Change-over point
COR	Correction
CPL	Commercial Pilot License
CFI	Certified Flight Instructor
CRI	Class Rating Instructor
CRM	Crew Resource Management
CRZ	Cruise
CS	Call Sign
CS	Cirrostratus
CTA	Control Area
CTA	Calculated Time of Arrival
CTAM	Climb To And Maintain
CTC	Contact
CTL	Control
CTR	Control Zone
CU	Cumulus
CUF	Cumuliform
CUST	Customs
CVR	Cockpit Voice Recorder
CWY	Clearway
DA	Decision altitude
D-ATIS	Digital Automatic Terminal Information Service
DCD	Data Link Departure Clearance
DCKG	Docking
DCP	Datum crossing point
DCS	Double channel simplex
DCT	Direct / Direct To
DEC	December
DEG	Degrees
DEP	Departure
DEPO	Deposition
DER	Departure end of the runway
DES	Descend
DEST	Destination
DETRESFA	Distress Phase
DEV	Deviation
DF	Direction Finding
DFDR	Digital Flight Data Recorder
DFTI	Distance from Touchdown Indicator
DH	Decision Height
DIF	Diffuse
DIST	Distance
DIV	Divert
DLA	Delay
DLIC	Data Link Initiation Capability
DLY	Daily
DME	Distance Measurement Equipment Read More
DNG	Danger
DOM	Domestic
DP	Departure Procedure Read More
DP	Dew Point
DP	Decision Point
DP	Differential Pressure
DPT	Depth
DR	Dead Reckoning
DR	Low Drifting
DRG	During
DS	Dust Storm
DSB	Double Sideband
DTAM	Descend to and maintain
DTG	Distance-To-Go
DTG	Date-Time Group
DTHR	Displaced Threshold
DTRT	Deteriorate
DTW	Dual tandem wheels
DU	Dust
DUC	Dense Upper Cloud
DUR	Duration
D-VOLMET	Data link VOLMET
DVOR	Doppler VOR
DW	Dual wheels
DZ	Drizzle
E	East
EAT	Expected Approach Time
EB	Eastbound
EDA	Elevation Differential Area
EET	Estimated Elapsed Time
EFC	Expect Further Clearance
EFIS	Electronic Flight Instrument System Read More
EGNOS	European Geostationary Navigation Overlay Service
EHF	Extremely High Frequency
ELBA	Emergency Locator Beacon-Aircraft
ELEV	Elevation
ELR	Extra long range
ELT	Emergency Locator Transmitter
EASA	European Union Aviation Safety Agency
EM	Emission
EMBD	Embedded
EMERG	Emergency
END	Endurance
ENE	East-North-East
ENG	Engine
ENR	En route
ENRC	Enroute chart
EOBT	Estimated off-block time
EQPT	Equipment
ESE	East-South-East
EST	Estimate
ETA	Estimated Time of Arrival
ETD	Estimated Time of Departure
ETO	Estimated Time Over
EUR RODEX	European Regional OPMET Data Exchange system
EV	Every
EVS	Enhanced Vision System
EXC	Except
EXER	Exercises
EXP	Expect / Expected
EXTD	Extend
F	Fixed
FAC	Facilities
FAF	Final Approach Fix
FAP	Final Approach Point
FAS	Final Approach Segment
FATO	Final Approach and Takeoff Area
FAX	Facsimile / Facsimile Transmission
FC	Flight Cycle
FCST	Forecast
FCT	Friction coefficient
FDPS	Flight data processing system
FEB	February
FEW	Few
FG	Fog
FIC	Flight Information Center
FIR	Flight Information Region
FIS	Flight Information Service
FISA	Flight Information Service Automated
FL	Flight Level
FLD	Field
FLG	Flashing
FLR	Flares
FLT	Flight
FLTCK	Flight Check
FLUC	Fluctuating
FLW	Follow
FLY	Fly
FM	From
FMC	Flight Management Computer
FMS	Flight Management System Read More
FMU	Flow Management Unit
FNA	Final Approach
FPAP	Flight Path Alignment Point
FPL	Flight Plan
FPM	Feet Per Minute
FPR	Flight plan route
FR	Fuel remaining
FREQ	Frequency
FRI	Friday
FRNG	Firing
FRONT	Front
FROST	Frost
FRQ	Frequent
FSL	Full Stop Landing
FSS	Flight service station
FST	First
FT	Feet
FTE	Flight Test Engineer
FTE	Flight Technical Error
FI	Flight Instructor
FAA	Federal Aviation Administration
CFII	Certified Flight Instructor Instrument
FE	Flight Examiner
FIE	Flight Instructor Examiner
FIIE	Flight Instructor Instrument Examiner
DPE	Designated Pilot Examiner
FTP	Fictitious threshold point
FTT	Flight technical tolerance
FU	Smoke
FZ	Freezing
FZDZ	Freezing drizzle
FZFG	Freezing fog
FZRA	Freezing rain
G	Gravitational Force / G Force
GA	General Aviation
+G	Positive G Force
-G	Negative G Force
G/A	Ground-to-Air
GAGAN	GPS-Aided GEO Augmented Navigation
GAMET	General Aviation Meteorological Forecast
GARP	GBAS Azimuth Reference Point
GBAS	Ground-Based Augmentation System
GCA	Ground-Controlled Approach
GEN	General
GEO	Geographic
GES	Ground Earth Station
GLD	Glider
GLONASS	Global Navigation Satellite System
GLS	GBAS Landing System
GMC	Ground Movement Control
GND	Ground
GNDCK	Ground check
GNSS	Global Navigation Satellite System
GP	Glide Path
GPA	Glide Path Angle
GPIP	Glide Path Intercept Point
GPS	Global Positioning System Read More
GPWS	Ground Proximity Warning System
GR	Hail
GRAS	Ground-based Regional Augmentation System
GRIB	General Regularized Information in Binary
GRVL	Gravel
GS	Ground Speed
GUND	Geoid Undulation
H	High pressure area
H24	Continuous day and night service
HA	Holding
HAPI	Helicopter Approach Path Indicator
HBN	Hazard beacon
HDF	High frequency direction-finding station
HDG	Heading
HEL	Helicopter
HF	High Frequency
HGT	Height
HJ	Sunrise to sunset
HLDG	Holding
HN	Sunset to sunrise
HO	Service available to meet operational requirements
HOL	Holiday
HOSP	Hospital aircraft
HPA	Hectopascal
HR	Hours
HS	Service available during hours of scheduled operations
HUD	Head-Up Display
HURCN	Hurricane
HVDF	High and very high frequency directionfinding stations
HVY	Heavy
HX	No specific working hours
HYR	Higher
HZ	Haze
HZ	Hertz
IAC	Instrument approach chart
IAF	Initial approach fix
IAO	In and out of clouds
IAP	Instrument approach procedure
IAR	Intersection of air routes
IAS	Indicated airspeed
IBN	Identification beacon
IC	Ice crystals
ICE	Icing
ID	Identifier
IDENT	Identification
IF	Intermediate Fix
IFF	Identification Friend or Foe
IGA	International general aviation
ILS	Instrument Landing System Read More
IM	Inner marker
IMG	Immigration
IMI	Interrogation Sign (Question Mark)
IMPR	Improve
IMT	Immediate
INA	Initial approach
INBD	Inbound
INC	In cloud
INCERFA	Uncertainty phase
INFO	Information
INOP	Inoperative
INP	If not possible
INPR	In progress
INS	Inertial Navigation System
INSTL	Install
INSTR	Instrument
INT	Intersection
INTL	International
INTRG	Interrogator
INTRP	Interrupt
INTSF	Intensify
INTST	Intensity
IR	Instrument Rating
IR	Infrared
IRS	Inertial Reference System
ISA	International standard atmosphere
ISB	Independent sideband
ISOL	Isolated
JAN	January
JTST	Jet stream
JUL	July
JUN	June
KG	Kilograms
KHZ	Kilohertz
KIAS	Knots indicated airspeed
KM	Kilometres
KMH	Kilometres per hour
KPA	Kilopascal
KT	Knots
KW	Kilowatts
JAMG	Jamming
JATO	Jet-Assisted Take-Off
JS	Jumpseat
JOC	Jet Orientation Course
JFO	Junior First Officer
JAA	Joint Aviation Authorities
JAR	Joint Aviation Requirements
JAR-OPS	Joint Aviation Regulations Operations
KTAS	Knots True Airspeed
KGS	Knots Ground Speed
KTS	Knots
L	Left
L	Locator
L	Low Pressure Area / Centre of Low Pressure
LAM	Logical Acknowledgement Message
LAN	Inland
LAT	Latitude
LCA	Local / Location
LDA	Landing Distance Available
LDAH	Landing Distance Available, Helicopter
LDG	Landing
LDI	Landing Direction Indicator
LEN	Length
LF	Low frequency
LGT	Light
LGTD	Lighted
LIH	Light intensity high
LIL	Light intensity low
LIM	Light intensity medium
LINE	Line
LM	Loadmaster
LM	Land Margin
LMT	Local mean time
LNAV	Lateral Navigation
LNG	Long
LO	Locator, Outer
LO	Low
LOC	Localizer
LONG	Longitude
LORAN	Long Range Navigation
LOSS	Airspeed or Headwind Loss
LPV	Localizer Performance with Vertical Guidance
LR	Long Range
LR	The last message received by me was…
LRG	Long Range
LS	The last message sent by me was…
LTD	Limited
LTP	Landing threshold point
LTT	Landline teletypewriter
LV	Light and variable
LVE	Leave or leaving
LVL	Level
LVP	Low visibility procedures
LYR	Layer
M	Metres
M	Mach number
M	Minimum value of runway visual range
MAA	Maximum authorized altitude
MAG	Magnetic
MAHF	Missed approach holding fix
MAINT	Maintenance
MAP	Manifold Absolute Pressure
MAP	Aeronautical Maps and Charts
MAPT	Missed approach point
MAR	At sea
MAR	March
MAS	Manual Al simplex
MATF	Missed approach turning fix
MAX	Maximum
MAY	May
MBST	Microburst
MCA	Minimum crossing altitude
MCW	Modulated continuous wave
MDA	Minimum descent altitude
MDF	Manual Direction Finder
MDH	Minimum Descent Height
MEA	Minimum Enroute Altitude
MEHT	Minimum Eye Height over Threshold
MET	Meteorological / Meteorology
METAR	Aeronautical Meteorological Report Read More
MET REPORT	Local routine meteorological report
MF	Medium frequency
MHDF	Medium and high frequency directionfinding stations
MHVDF	Medium, High, and Very High Frequency Direction-Finding Stations (at the same location)
MHZ	Megahertz
MID	Mid-point
MIFG	Shallow fog
MIL	Military
MIN	Minutes
MIS	Missing
MKR	Marker radio beacon
MLS	Microwave Landing System Read More
MM	Middle marker
MNM	Minimum
MNPS	Minimum navigation performance specifications
MNT	Monitor / Monitoring
MNTN	Maintain
MOA	Military operating area
MOC	Minimum obstacle clearance
MOCA	Minimum obstacle clearance altitude
MOD	Moderate
MON	Minimum Operational Network
MON	Above Mountains
MON	Monday
MOPS	Minimum operational performance standards
MOV	Move / Moving
MPS	Metres per second
MRA	Minimum Reception Altitude
MRG	Medium range
MRP	ATS Meteorological Reporting Point
MS	Minus
MSA	Minimum sector altitude
MSAS	Multi-functional Satellite Augmentation System
MSAW	Minimum safe altitude warning
MSG	Message
MSL	Mean sea level
MSR	Main Supply Route
MSR	Message Re-transmission
MSSR	Monopulse secondary surveillance radar
MT	Mountain
MTU	Metric units
MTW	Mountain waves
MVDF	Medium and Very High Frequency Direction-Finding Stations (at the same location)
MWO	Meteorological watch office
MX	Mixed Ice
MX	Maintenance
ADIRS	Air Data Inertial Reference System Read More
N	North
NADP	Noise abatement departure procedure
NASC	National AIS system centre
NAT	North Atlantic
NAV	Navigation
NB	Northbound
NBFR	Not before
NC	No change
NCD	No cloud detected
NDB	Non-Directional Beacon
NDV	No Directional Variations available
NE	North-east
NEB	North-eastbound
NEG	Negative / No
NGT	Night
NIL	None
NM	Nautical miles
NML	Normal
NN	No name
NNE	North-north-east
NNW	North-north-west
NO	No (negative)
NOF	International NOTAM office
NOSIG	No significant change
NOTAM	Notice to Airmen
NOTAM	Notice to Air Missions
NOV	November
NOZ	Normal operating zone
NPA	Non-precision approach Read More
NR	Number
NRH	No reply heard
NS	Nimbostratus
NSC	Nil Significant Cloud
NOSIG	No Significant Change
NSE	Navigation system error
NSW	Nil significant weather
NTL	National
NTZ	No transgression zone
NW	North-west
NWB	North-westbound
NXT	Next
ND	Navigation Display Read More
NCS	Network Communication System
NEI	Noise Exposure Index
NEO	New Engine Option
NEWEOBT	New Estimated Off-block Time
NEWETOT	New Estimated Take-off Time
NEWPTOT	New Provisional Take-off Time
NEWRTE	New Route
NEXRAD	Next Generation Weather Radar
NF	Noise Figure
NFC	Near Field Communication
NFDC	National Flight Data Center
NFL	Entry Flight Level
NFPPDS	National Flight Plan Processing System
NFS	Network Filing System
NFY	Notify name and address
NG	Next – Generation
NGATM	New Generation Air Traffic Manager
NI	Next Information
NIEC	Next Gen Integration and Evaluation Capability
NIM	Navigational Integrity Monitoring
NIMA	National Imagery and Mapping Agency
NLA	New Large Aircraft
NLES	Navigation Land Earth Station
NLT	Not Later Than
NM	North Marker
NM	Nautical Mile
NMAC	Near Mid Air Collision
NMC	National Meteorological Cente
NML	Normal
NMR	Nautical Miles Radius
NMS	Navigation Management System
NMU	Navigation Management Unit
nnnn	End of message
NNE	North North-East
NNW	North North-West
NOC	Network Operation Centre
NOK	Not OK status
NOMAS	NOTAM Management System
NON STD	Non-standard
NOOP	No operation
NoPT	No Procedure Turn required
NORAC	No Radio Contact
NORDO	No Radio / Aircraft without radio
NOTAMN	New Notam
NOTAMR	Notam Replacing another Notam
NOTAMC	Notam Cancelling another Notam
NOTOC	Special load Notification to Commander
ns	Nanosecond
NS	Navigation Separation
NS	Next Sector
O2	Oxygen
OAC	Oceanic Area Control Centre
OAG	Official Airline Guide
OALP	Outgoing Aeronautical Logic Procedures
OAMS	Onboard Asynchronous Messaging Service
OANS	Onboard Airport Navigation System
OAS	Obstacle Assessment Surface
OAP	Output Audio Processor
OASIS	Operational and Supportability Implementation System
OAT	Outside Air Temperature
O/B	Onboard
OBAD	Old But Active Data
OBCE	On-Board Control Equipment
OBND	Outbound
OBS	Omni Bearing Selector Read More
OBSC	Obscured
OBST	Obstacle
OBSTL	Obstruction Lights
OBT	Off Block Time
OBWBS	Onboard Weight Balance System
OBX	Obnoxious cargo
OC	Object Correlator
OCA	Obstacle Clearance Altitude
OCAP	Out of Control Action Plan
OCC	Operations Control Center
OCC	Occulting light
OCFNT	Occluded front
OCH	Obstacle Clearance Height
OCL	Obstacle Clearance Limit
OCL	Oceanic Clearance delivery
OCLN	Occlusion
OCNL	Occasional
OCM	Oceanic Clearance Message
OCP	Obstacle Clearance Panel
OCP	Organisations Certification Procedure
OCR	Operational and Certification Requirements
OCR	Occur
OCRI	Operational Cost Reduction Initiative
OCS	Obstacle Clearance Surface
OCT	Onward Clearance Time
OCV	Operational Coverage Volume
O&D	Origin & Destination
ODA	Open Document Architecture
ODAPS	Oceanic Display And Planning System
ODF	Oceanic Development Facility
ODID	Operational Display and Input Development
ODS	Operational Display System
ODS	Operator input and Display System
ODT	Operational Requirements and Data Processing Team
ODU	Output Distribution Unit
OECM	Operational Efficiency & Cost Management
OEI	One Engine Inoperative
OEM	Original Equipment Manufacturer
OEW	Operational Empty Weight
OFC	Office
OFF	Offload
OFFD	Offloaded cargo
OFFPDR	Off Predetermined Route
OFIR	Oceanic FIR
OFIS	Operational Flight Information System
OFL	Off-Line
OFL	Outflow
OFMV	Oil Flow Management Valve
OFP	Operational Flight Plan
OFP	Occluded frontal passage
OFS	Ordered Field Sequencing
OFST	Lateral Offset Active Light
OFZ	Obstacle Free Zone
OGE	Operational Ground Equipment
OGN	Originate
OH	Operational Handbook
OH	Overhaul
OHD	Overhead
OHD	On Hand baggage
OHDU	Overheat Detection Unit
OHP	Overhead Panel
OHSAS	Occupational Health & Safety Management Systems
OHSC	Overhead Stowage Compartment
OI	Operational Interruption
OIDS	Operational Information Display System
OIS	Obstacle Identification Surface
OIS	Onboard Information System
OJT	On the job training
OL	Operating Location
OLCI	Online Check-in
OLDI	On-line Data Interchange
OLR	Off Load Route
OLS	Off Line System
OLS	Obstacle Limitation Surface
OM	Operations Manual
OM	Outer Marker
OMC	Operational Monitoring Complex
OMG	Operational Monitoring Group
OMM	Organisation´s Management Manual
OMS	Outboard Maintenance System
ONP	Open Network Provision
OOEU	Outboard Overhead Electronics Unit
OOT	Oil Outlet Temperature
OP	Output
OPD	Optimized Profile Descent
OPB	Outer Performance Boundary
OPIF	Operator Interface
OPMET	Operational Meteorological Information
OPN	Open / Opened
OPP	Opposite
OPR	Operate
OPS	Operations
OPSEC	Operational Security
OPSP	Operations Panel
OPT	Operational Testing
OPT	Optimum
OPU	Overspeed Protection Unit
OR	Operational Requirement
ORD	Operational Requirements Document
ORGMSG	Original Message
ORGRTE	Original Route
ORIG	Original
ORM	Operational Reply Message
OSCAR	Orbiting Satellite Carrying Amateur Radio
OSCU	Oxygen System Control Unit
OTP	On top
OTP	Operational Test Plan
OUTB	Outbound
OUTR	Outer
OVC	Overcast -8 octas
OVCD	Overcarried
OVDR	Overdoor
OVFL	Overfill
OVHD	Overhead
OVHT	Overheat
OVWG	Overwing
OVR	Over
OVSPD	Overspeed
OW	Operating Weight
OXY	Oxygen for cabin
NTSB	National Transportation Safety Board
PA	Precision Approach Read More
ACP	Audio Control Panel Read More
PAA	Plot Accuracy Analysis
PAC	Pacific Region
PAC	Preliminary Activation message
PA/CI	Passenger Address/Cabin Interphone
PACIS	Passenger Address and Communication Interphone System
PCH	Patch
PAD	Passenger Available for Disembarkation
PADIS	Passenger and Airport Data Interchange Standards
PADS	Pneumatic Air Distribution System
PAEW	Personnel and Equipment Working
PAK	Pilot Acknowledgement
PALCO	Passenger and Load Control
PALS	Precision Approach Lighting System
PAM	Pilot Acknowledgement Message
PAMCS	Panel on Air Space Management and Control Systems
PANS	Procedures for Air Navigation Services
PAPA	Parallax Airplane Parking Aid
PAPI	Precision Approach Path Indicator
PAQ	Position Analysis Questionnaire
PAR	Planning Analysis and Reporting
PAR	Precision Approach Radar
PARS	Programmed Airline Reservation System
PARL	Parallel
PAS	Pitch Attitude Sensor
PAT	Pattern
PATC	Precision approach terrain chart
PATCO	Professional Air Traffic Controllers Association
PATS	Passenger Air-to-Ground Telephone System
PATWAS	Pilot Automatic Telephone Weather Answering Service
PAU	Passenger Address Unit
PAX	Passengers
pb	Push Button
PBD	Place Bearing/Distance
PBE	Protective Breathing Equipment
PBIT	Power-Up Built-in Test
PBH	Power by the Hour
PBL	Problem Based Learning
APU	Auxiliary Power Unit Read More
PBN	Performance Based Navigation
PBRA	Plot Based Resolution Analysis
PBSELV	Park Brake Selector Valve
PBSW	Pushbutton Switch
PBWS	Passenger Baggage Weight Statement
PBX	Place-Bearing Waypoint
PCA	Physical Configuration Audit
PCB	Printed Circuit Board
PCD	Proceed
PCFL	Preferred Cruise Flight Level
PCI	Protocol Control Information
PCIP	Pilot Conversion and Implementation Plan
PCIP	Precipitation
PCL	Pilot Controlled Lighting
P-CLB	Profile Climb
PCM	Planning Coordination Message
PCM	Pulse Code Modulation
PCN	Pavement Classification Number
PCOS	Power Cowl Opening System
PCPN	Precipitation
PCR	Periodic Contract Request
PCR	Problem Change Request
pcs	Pieces
PCS	Process Control System
PCT	Planning Control Theory
PCT	Percent
PCU	Power Control Unit
PCV	Probability of Code Validation
PD	Plan Display
PD	Profile Descent
PD	Period
PDB	Performance Data Base
PDC	Pre-Departure Clearance
PDCS	Power Distribution Control System
P-DES	Profile Descent
PDF	Primary Display Function
PDG	Procedure Design Gradient
PDL	Portable Data Loader
PDME	Precision Distance Measuring Equipment
PDMC	Power Distribution Maintenance Computer
PDMI	Power Distribution Maintenance Interface
PDN	Public Data Network
PDO	Power Door Opening
PDOP	Position Dilution of Precision
PDOS	Powered Door Opening System
PDR	Pre-Determined Route
PDRP	Problem Detection and Resolution
PDS	Programme Development System
PDU	Power Distribution Unit
PDU	Pilot Display Unit
PE	Ice Pellets (MET)
PEC	Pressure Error Correction
PED	Personal Electronic Devices
PED	Portable Electronic Device
PEF	Pylon Extension Fairing
PEL	Planned Entry Level
PELA	Proficiency test in English Language for ATCOs
PEP	Program Execution Plan
PEPC	Primary External Power Contactor
PER	Performance
PERF	Performance
PERM	Permanent (MET)
PERT	Programme Evaluation and Review Technique
PES	Passenger Entertainment System
PF	Pilot Flying
PFA	Probability of False Alarm
pFAST	passive Final Approach Spacing Tool
PFC	Pre-flight check
PFC	Primary Flight Computer
PFD	Primary Flight Display Read More
PFE	Path Following Error
PFIS	Passenger Flight Information System
PFL	Planned Flight Level
PFM	Pre-Flight Messages
PFR	Probability of Failure Repair
PFTU	Pedal Feel and Trim Unit
PHA	Preliminary Hazard Analysis
PHAK	Pilot’s Handbook of Aeronautical Knowledge
PHINOM	Nominal Bank Angle
PHM	Passenger Handling Manual
PI	Performance Indicator
PHMI	Probability of Hazardously Misleading Information
PIC	Pilot In Command
PIP	Plug In Panel
PLA	Practise Low Approach
PLB	Personal Locator Beacon
PLN	Flight Plan
PLVL	Present Level
PLRS	Position Location and Reporting System
PM	Post Meridiem
PM	Pilot Monitoring
PMP	Pump
PMU	Power Management Unit
PNF	Pilot Not Flying
PNL	Panel
PNR	Point of No Return
PWR	Power
PSR	Point of Safe Return
PWP	Published Way Point
PUB	Publications and Charts
PTT	Push to Talk
PTU	Power Transfer Unit Read More
PTN	Procedure Turn
PTNL	Potentional
PTH	Path
PTLY	Partly (MET)
Pt	Total Pressure
PT	Point
PT	Pitot Tube
PSYS	Pressure System/s
P/S	Pitot-Static System
QA	Quality Assurance
QAD	Quick-Attach-Detach
QAP	Quality Assurance Programme
QAM	Quadrature Amplitude Modulation
QAR	Quick Access Recorder
QAT	Quadruple ARINC Transmitter
QBI	Compulsory IFR Flight
QC	Quality Control
QCM	Quality Control Manager
QDM	Magnetic Heading
QDR	Magnetic Bearing
QDR	Quadrantal
QEC	Quick Engine Change
QF	Quality Factor
QFE	Quoted Field Elevation (or atmospheric pressure at field elevation)
QFF	the atmospheric pressure at a specific station (such as an airfield) reduced to mean sea level (MSL) using actual, real-time meteorological conditions
QFU	Magnetic orientation or runway in use
QGH	Controlled descent through cloud
QGO	Airfield closed due to weather
QNE	ISA Standard atmospheric pressure setting of 1013.2 mb
QNF	Altimeter subscale setting to obtain elevation when on ground
QNH	Atmospheric Pressure at mean sea leve
QP	Quality Plan
QRF	Quick Return Flight
QRG	Quick Reference Guide
QRH	The barometric pressure as reported by a particular station
QRH	Quick Reference Handbook
QRT	Quick ramp transfer
QSR	Quality Safety Requirement
QT	Quart
QTE	True bearing
QTY	Quantity
QUAD	Quadrant
R/C	Rate of Climb
R/D	Rate of Descent
R/I	Radio/Inertial
R/T	Radio Telephonic Transmission
R	Right (Runway 26 R)
RA	Radio Altitude
RA	Rain
RA	Resolution Advisory
RA	Risk Analysis
RAA	Regional Airline Association
RAARR	Radar Arrival
RAAS	Regional Area Augmentation System
RAC	Resolution Advisory Complement
RACC	Rotor Active Clearance Control
RACE	Runway Capacity Enhancement
RACSB	Rotor Active Clearance Start Bleed
RAD	Radar
RAD	Radio
RAD	Radial
RADAR	Radio Detecting and Ranging
RADEP	Radar Departure
RADIN	Radar Data Interchange Network
RADIN	Radar Data Interface
RADNET	Radar Network
RAF	Requirements Analysis Folder
RAFC	Regional Area Forecast Centre
RAG	Ragged
RAI	Runway Alignment Indicator
RAI	Ram Air Inlet
RAIL	Runway Alignment Indicator Lights
RAIM	Receiver Autonomous Integrity Monitoring
RALT	Name of en route alternate aerodrome
RAN	Regional Air Navigation
RANSU	Regional Air Navigation Service Unit
RAPCON	Radar Approach Control Facility
RAR	Restricted Area Requested
RARAD	Radar Advisory
RASP	Radar Surface Picture
RAT	Ram Air Turbine
RB	Rescue Boat
RC	Radar Controller
RCA	Reduced Coordination Airspace
RCA	Reach Cruising Altitude
RCC	Rescue Coordination Centre
RCDR	Recorder
RCF	Radio Communications Failure
RCH	Reach/ing
RCL	Runway Centre Line
RCLL	Runway Centre Line Lights
RCLR	Re-cleared
RCMD	Recommend/ed
RCOM	Recovery Communication
RCP	Required Communication Performance
RCP	Radio Control Panel
RCR	Runway Condition Reading
RCS	Radar Cross Section
RCS	Remote Control System
RCU	Radio control unit
RCV	Receive
RCVR	Receiver
RD	Risk Display
RD	Requirements Document
RDC	Reduce
RDF	Radio Direction Finding
RDDII	Radio Digital Distance Magnetic Indicator
RDG	Radar Data Generator
RDH	Reference Datum Height
RDI	Radio Direction Indicator
RDIF	Radar Data Interchange Format
RDL	Radial
RDM	Running Display Message
RDMI	Radio Distance Magnetic Indicator
RDO	Radio
RDP	Radar Datum Point
RDPP	Radar Data Post Processor
RDPS	Radar Data Processing System
RDQC	Radar Data Quality Control
RDR	Radar Data Recording
RE	Right Engine
REA	Ready Message
REC	Receive / Receiver
RECONF	Reconfiguration
REDL	Runway Edge Lights
REF	Reference
RFF	Rescue and Fire Fighting
REG	Registration
REG	Regulation
REGR	Recent Hail
REIL	Runway End Identifier Lights
REJ	Rejection Message
REJCTOT	Rejected Calculated Take-Off Time
REL	Release
REL	Runway Entrance Lights
RELCTD	Relocated
REM	Radio Emergency Module
RENL	Runway End Lights
REP	Reporting Point
REQ	Request
RER	Rerouting
RERA	Recent rain (METAR)
RERTE	Reroute
RESA	Runway End Safety Area
RESTR	Restriction
RET	Return
RET	Retract
RETD	Revised Estimated Time of Departure
RF	Radio Frequency
REV	Revision message
RFC	Request for Change
RFCP	Route Facility Costs Panel
RFG	Radio Frequency Generator
RFI	Radio Frequency Interference
RFI	Request For Information
RFL	Requested Flight Level
RFLNG	Refueling
RFP	Request for Offer
RFP	Repetitive Flight Plan
RFQ	Request for Quotation
RFPS	Radar data Front Processing System
RFU	Radio Frequency Unit
RG	Range
RG	Retractable Landing Gear
RGB	Red/Green/Blue
RGS	Regional Ground Station
RH	Right Hand – turn
RH	Relative Humidity
RHC	Right-hand circuit
RHCP	Right Hand Circular Polarisation
RHD	Radio Horizon Distance
RHF	Ridiculously High Frequency
RHL	Rudder Hinge Line
RI	Route Intercept
RIB	Routing Information Base
RIC	Radar Integration Control
RIF	Radio Interface
RIF	Reclearance in Flight
RIL	Runway Intersection Lights
RJT	Rerouting Rejection Message
RL	Runway Lights
RLA	Relay to
RLCE	Request Level Change Enroute
RLIM	Radar Data Line Interface Module
RLG	Ring Laser Giro
RLLS	Runway Lead In Light System
RLNA	Requested Level Not Available
RLOC	Record Locator
RLS	Reliable Link Service
RLSD	Released
RLSM	Reduced Lateral Separation Minimum
RM	Route Manual
RMCP	Radio Management Control Panel
RMCS	Remote Monitoring and Control System
RMI	Radio Magnetic Indicator
RMK	Remarks
RMM	Remote Maintenance Monitoring
RMP	Radio Management Panel
RMP	Required Monitoring Performance
RMPS	Radar Message Processing System
RMS	Revenue Management System
RMT	Remote (Airbus)
RMU	Radio Management Unit
RNAV	Area Navigation What is RNAV in Aviation
RNC	Required Navigation Capability
RNG	Radio Range
RNP	Required Navigation Performance
RNPC	Required Navigation Performance Capability
ROA	Request Of Assistance
ROC	Rate of Climb
ROD	Rate of Descent
ROF	Request on Frequency
ROFOR	Route Forecast
ROLS	Remote Oil Level Sensor
RON	Receiving Only
ROR	Range Only Radar
ROS	Route Orientation Scheme
ROT	Rate of Turn
ROTG	RNAV off the Ground
ROZ	Restricted Operations Zone
RP	Reporting Point
RPD	Rapid
RPI	Radar position indicator
RPLC	Replace / Replaced
RPM	Revolution per Minute
RPS	Radar Position Symbol
RPS	Recording and Playback System
RPT	Regular proficiency Training
RPT	Repeat
RPTG	Repeating
RPU	Radar Processing Unit
RPV	Remotely Piloted Vehicle
RPVD	Radar Plan View Display
RQA	Request for Acknowledge signal
RQMNTS	Requirements
RQN	Request NOTAM
RQP	Request for Flight Plan
RQRD	Required
RQS	Request Supplementary Flight Plan
RR	Report Reaching
RRA	Radar Recording Analysis
RRC	Range-Rate Corrections
RRL	Runway Remaining Lights
RRN	Rerouting Notification Message
RRT	Change of routing
RRTEREF	Reroute Reference
RRTES	Reroutes
RRU	Remote Radio Unit
RRV	Referred Revision Message
RS	Radar System
RSA	Radar Service Area
RSCD	Runway Surface Condition
RSI	Radiation Status Indicator
RSK	Risk
RSLS	Receiver Side Lobe Suppression
RSM	Radar Service Message
RSMTF	Radar Separation Minimum Task Force
RSP	Required System Performance
RSP	Responder Beacon
RSPD	Reported Speed
RSPL	Recommended Spare Parts List
RSR	En Route Surveillance Radar
RSS	Radar Separation Standard
RSSP	Radar Systems Specialist Panel
RST	Reset
RSU	Remote Status Unit
RSV	Reserves
RT	Right Turn
RT	Radio Transmit
RTA	Reduced Vertical Separation Minimum Transition Area
RTA	Required Time of Arrival
RTB	Radar Tool Box
RTC	Rudder Trim Control
RTC	Radio Transmission Control
RTC	Real Time Control
RTD	Research and Development of Technologies
RTE	Route
RTF	Radio Telephony
RTFM	Regulated Tactical Flight Model
RTG	Radio Telegraph
RTHL	Runway Threshold Lights
RTHP	Runway Taxi-Holding Position
RTLS	Return To Launch Site
RTM	Real Time Monitoring
RTN	Return
RTO	Rejected Take-Off
RTOD	Real Time Orbit Determination
RTOS	Real Time Operating System
RTODAH	Rejected Take-Off Distance Available Helicopter
RTOW	Ramp Take-off Weight
RTOW	Regulated Take-off Weight
RTQC	Real Time Quality Control
RTS	Return to Service
RTT	Ready to Task
RTZL	Runway Touchdown Zone Lights
RUC	Rapid Update Cycle
RUF	Rough
RUT	Standard Regional Route Transmitting
RVR	Runway Visual Range
RVRM	Runway Visual Range Midpoint
RVRNO	Runway not available
RVRR	Runway Visual Range Rollout
RVRT	Runway Visual Range Touchdown
RVSG	Reversing
RVSM	Reduced Vertical Separation Minimum
RVT	Rotational Variable Transformer
RWEWP	Runway End Way point
RWI	Reduced Weather Impact
RWIWP	Runway Intercept Way point
RWP	Real-time Weather Processor
RWSL	Runway Status Lights
RWY	Runway
RWY WP	Runway Waypoint
RX	Receiver Station
S/C	Step Climb
S/D	Step Descent
s	seconds
S	South
SA	Sand (Meteorology)
SA	Selective Availability
SA	Situational Awareness
SAC	Sensitive Application Certification
SADIS	Satellite Distribution System
SAE	Standard Aerospace Equipment
SAFER	Safety and Errors
SAFI	Semi-Automatic Flight Inspection
SAFI	Safety Monitoring for Indicators
SAI	System Architecture Interface
SAL	Seat Allocation List
SAL	System Address Label
SALADT	Screening Angle Analysis Digitised Terrain
SALS	Simple Approach Light System
SAM	Slot Allocation Message
SAM	Surface-to-Air Missile
SAM	Standby Attitude Module
SAN	Sanitary
SAP	Safety Accident Procedure
SAP	Soon as Possible
SAPPHIRE	Satellite and Aircraft Database Programme for System Integrity Research
SAPR	Safety Assurance Process Requirements
SAR	Search and Rescue
SARP	Signal Automatic Radar Processing
SARPS	Standards and Recommended Practices
SARSAT	Search and Rescue Satellite Aided Tracking
SAS	Safety Analysis System
SASO	System Approach for Safety Oversight
SASPO	Soon as possible
SASS	Surveillance Analysis Support System
SAT	Saturday
SAT	Satellite
SAT	Simulation Assessment Team
SAT	Static Air Temperature
SATCNS	Satellite Communications Navigation and Surveillance
SATCO	Signal Automatic Control
SATCOM	Satellite Communications
SATORI	Systematic Air Traffic Operations Research Initiative
SATS	Simulator System for Air Traffic Services
SAW	Surface Acoustic Wave
SAWRS	Supplementary Aviation Weather Reporting Station
SB	Service Bulletin
SB	Southbound
SBC	Standby cargo
SBEW	Standard Basic Empty Weight
SBR	Space borne Radar
SBR	Self Briefing
SBSR	Space Based Secondary Radar
SBT	Self Briefing Terminal
SC	Stratocumulus (Meteorology)
SCAP	Security Certification and Authorization Package
SCAT	Supersonic Civil Air Transport
SCATANA	Security Control of Air Traffic and Air Navigation Aids
SCC	Satellite Control Centre
SCDT	Selected Controlled Departure Times
SCF	Satellite Control Facility
SCI	Superior Contribution Increase
SCIA	Simultaneous Converging Instrument Approaches
SCM	Spoiler Control Module
SCN	Specification Change Notice
SCO	Surface Contaminated Object
SCORS	Surveillance Concepts and Operational Requirements
SCP	Support Computer Programme
SCR	Specification Change Request
SCSI	Small Computer System Interface
SCT	Scattered 3-4 octas (Meteorology)
SCU	Satellite Communications Unit
SCU	Seat Control Unit
SCV	Sub Clutter Visibility
SD	Serial Dialing
SD	Standard Deviation
SD	System Display
SDAC	System Data Acquisition Concentrator
SDBY	Standby
SDCU	Smoke Detection Control Unit
SDD	Synthetic Data Display
SDDLC	System Design and Development Life Cycle
SDE	System Development Environment
SDF	Simplified Directional Facility
SDF	Smoke Detection Function
SDG	Sensor Data Generator
SDI	Source Destination Identifier
SDL	Standard Distribution List
SDLC	Synchronous Data Link Control procedures
SDLS	Satellite Data Link System
SDN	System Description Note
SDO	Static Data Operations
SDO	Supplementary Display Option
SDP	Special Departure Procedure
SDP	Steering Disconnect Panel
SDPD	Surveillance Data Processing and Distribution
SDPDS	Surveillance Data Processing and Distribution System
SDPS	Surveillance Data Processing System
SDR	System Design Review
SDU	Satellite Data Unit
SDV	Simulator Development
SE	South East
SEAT	Site Equipment Acceptance Test
SEB	Southeast Bound
sec	Seconds
SECN	Section
SECRA	Secondary Radar
SECT	Sector
SEI	Standby Engine Instruments
SEL	Single Engine Land
SEL	Select / Selected
sel	Selector
SEP	Single Engine Piston
SEP	Safety and Emergency Procedures
SEQ	Sequence
SER	Service
SER	Serial Number
SERNO	Serial Number
SERP	Station Emergency Response Planning
SES	Supplementary Equipment and Services
SEU	Single-Event Upset
SEU	Seat Electronics Unit
SEV	Severe
SF	Scaling Factor
SFAR	Special Federal Aviation Regulation
SFC	Surface
SFCC	Slat Flap Control Computer
SFD	Start Frame Delimiter
SFE	Supplier Furnished Equipment
SFL	Sequence Flashing Lights
SFL	Supplementary Flight Level
SFN	Starting Frame Number
SFPL	Short Flight Plan
SFPL	System Flight Plan Processing
SFT	Simplified Fast Time Simulations
SFW	Standard Fleet Weight
SG	Snow Grains (Meteorology)
SGC	Swept Gain Control
SGL	Signal
SH	Showers (Meteorology)
SHA	System Hazard Analysis
SHF	Super High Frequency
SHL	Still Holding
SHORAN	Short Range Navigation
-SHRA	Light rain showers
SHRA	Moderate rain showers
+SHRA	Heavy rain showers
SHRA	Rain Showers (METAR)
SHVR	Shaver (Boeing)
SI	International System of Units
SIAP	Standard Instrument Approach Procedure
SIC	Second-in-Command
SIC	Source Identification Code
SICASP	Secondary Surveillance Radar Improvements and Collision Avoidance System Panel
SID	Standard Instrument Departure What are Departure Procedures (DPs)
SID/STAR	Standard Instrument Departure / Standard Arrival Route What are Departure Procedures (DPs)
STAR	Standard Arrival Route What are Departure Procedures (DPs)
SIE	Standard Interface Equipment
SIF	Selective Identification features
SIG	Significant
SIGMET	Significant Meteorological Information
SIGWX	Significant Weather
SIL	Speech Interference Level
SIM	Simulator
SIMM	Symbolic Integrated Maintenance Manual
SIMMOD	Simulation Model
Simul	Simulation
SIMUL	Simultaneous / Simultaneously
SIR	Packed or Compacted Snow and Ice on Runway
SIRO	Simultaneous Intersecting Runway Operations
SIS	Signal In Space
SKC	Sky Clear (Meteorology)
SKED	Schedule
SL	Sefety Level
SL	Sea Level
SLAP	Slot Allocation Procedures
SLAR	Slide Looking Airborne Radar
SLB	Side Lobe Banking
SLD	Slide / Sliding
SLGT	Slight
SLI	Supplementary Level Inbound
SLM	Standard Length Message
SLO	Supplementary Level Outbound
SLOP	Strategic Lateral Offset Procedure
SLP	Speed Limit Point
SLR	Satellite Laser Ranging
SLR	Slush on Runway (NOTAM)
SLS	Satellite Landing System
SLS	Statistical Load Summary
SLT	Scheduled Landing Time
SLT	Slat
SLW	Sector Load Window
SLW	Selected Label Window
SMAE	Systems Management Application Entity
SMAN	Surface Management
SMART	Standard Modular Avionics Repair and Test
SMAW	Safe Minimum Altitude Warning
SMB	Side Marker Board
SMC	Surface Movement Control
SMEQ	Subjective Mental Effort Questionnaire
SMGC	Surface Movement Guidance and Control
SMGS	Surface Movement Guidance System
SMI	Standard Message Identifiers
SMK	Smoke
SML	Side marker line
SML	Small (Meteorology)
SMM	Safety Management Manual
SMOH	Since Major OverHaul
SMPI	Time Since Major Periodic Inspection
SMR	Surface Movement Radar
SMT	Surface Mount Technology
SMTP	Simple Mail Transfer Protocol
SN	Snow (Meteorology)
SN	Serial Number
SNA	Satellite Navigation Application
SNBNK	Snowbanks caused by wind blowing (Meteorology)
SNDC	Sub network Dependent Convergence Function
SNET	Safety Nets
SNGL	Single (Airbus)
SNICF	Sub network Independent Convergence Function
SNME	Sub network Management Entity
SNOCLO	Aerodrome closed due to snow
SOB	Souls on Board
SOBT	Scheduled Off-Block Time
SOC	Start of Climb
SOH	Since Overhaul
SOIR	Simultaneous Operations on parallel Instrument Runways
SOL	Sector Outbound List
SOM	Seat Occupied Message
SOP	Standard Operating Procedures
SOPA	Standard Operating Procedure Amplified
SOR	State of Readiness
SOV	Shut-Off Valve (Airbus)
SOS	Safety Overview System
SP	Space
SP	Service Provider
SP	Standard Precision
SPA	Operations requiring Specific Approvals
SPB	Special Baggage
SPAF	Strategic Performance Analysis and Forecast
SPAS	Sensor Performance Analysis Standard
SPD	Speed
Spec	Specification
SPECI	Aviation Selected Special Weather Report
SPECIAL	Special Meteorological local Report
SPI	Special Pulse Indicator
SPKR	Speaker
SPL	Supplementary Flight Plan
SPL	Sound Pressure Level
SPLR	Spoiler
SPMP	Software Project Management Plan
SPN	Short Plan Input
SPO	Specialised Operations
SPOC	SAR Point in Contact
SPOH	Since Propeller Overhaul
SPOT	Spot Wind
SPRDR	Spreader (Airbus)
SPS	Standard Positioning Service
SPST	Single Pole Single Throw (Airbus)
SPV	Supervisor
sq. in.	Square Inch
SQ	Squall
SQL	Squall Line
SQL	Structured Query Language
SQU	Squelch
SR	Sunrise (AIP)
SR 30	30 Minutes before Sunrise
SRA	Surveillance Radar Approach
SRA	Special Rules Area
SRB	Specification Review Board
SRC	Systems and Research Center
SRD	Standard Route Document
SRD	System Research and Development
SRE	Slant Range Error
SRG	Short Range
SRM	Sector Revision Message
SRM	Stabilizer Trim/Rudder Ratio Module
SRM	Safety Risk Management
SRP	Selected Reference Point
SRQ	Slot Request
SRR	Search and Rescue Region
SRS	Standard Routing Scheme
SRS	System Requirements Specification
SRS	Speed Reference System
SRT	Single Radar Tracker
SRY	Secondary
SRZ	Special Rules Zone
SS	Sunset (AIP)
SS	Sandstorm (Meteorology)
SSA	Side Slip Angle
SSB	Single Side Band
SSCI	Self-Service Check-in
SSCVR	Solid State Cockpit Voice Recorder
SSD	Synthetic Situation Display
SSE	South south east
SSE	Safety, Security and Environment
SSEC	Static Source Error Correction
SSFDR	Solid State Flight Data Recorder
SSIM	Standard Schedules Information Manual
SSM	Standard Schedules Messages
SSM	System Surveillance and Maintenance
SSR	Secondary Surveillance Radar
SSRC	Current SSR Code
SSS	Source Select Switch
SST	Supersonic Transport
SSTS	Space Surveillance and Tracking System
ST	Stratus (Meteorology)
STA	Scheduled Time of Arrival
STA	Straight in Approach
STA 0	Fuselage Station zero
STAB	Stabilizer setting
STABTO	Stabilizer setting at take-off
STAC	Second Time Around Clutter
STANINE	Standard Nine Score
STANLY	Statistics and Analysis system
STAT	Statistics
STATFOR	Specialist Panel on Air Traffic Statistics & Forecasts
STBL	Stable (Meteorology)
STBY	Standby
STC	Sensitivity Time Control
STC	Short Time Constant
STC	Simulation Technical Coordinator
STD	Scheduled Time of Departure
STD	Standard (altimeter setting)
STDY	Steady (Meteorology)
STF	Stratiform
STG	Strong (Meteorology)
STM	Surface Transportation Movement
STN	Station
STNR	Stationary
STOL	Short Take-off and Landing
STOP	Since Top Overhaul
STP	Standardized Training Package
STR	Station Report
STRANGE	Simplified Trajectory Generator
STRAT	Strategic Planning System
STRG	Steering
STS	Status
STT	Summer Time Table
STU	Selected Trajectory Update
STWG	Stowage (Airbus)
STWL	Stopway Lights
SUA	Special Use Airspace
SUBJ	Subject to (ICAO)
SUF	Sufficient
SUMI	Software Usability Measurement Inventory
SUP	Supplement (AIP)
SUP/ACC	Supervisor Area Control Centre
SUP/APP	Supervisor Approach
SUP/MIL	Supervisor military
SUPPS	Regional Supplementary Procedures
SUR	Surface transportation
SURFIA	Surface Indications and Alerts
SV	Secure Voice
SV	Space Vehicle
SVC	Switched Virtual Circuits
SVCBL	Serviceable
SVN	Satellite Vehicle Number
SVRWX	Severe Weather
SVS	Synthetic Vision System Synthetic Vision System (SVS)
sw	Switch
SWAP	Severe Weather Avoidance Procedure
SWAT	Subjective Workload Assessment Technique
SWB	Southwest Bound
SWDL	Software Data Loader
SWL	Sidewall (Boeing)
SWTG	Switching (Airbus)
SWY	Stopway
T/O	Takeoff
t	Tons
T	Temperature
TA	Traffic Advisory
TA	Transition Altitude
TAA	Terminal Arrival Attitude
TACAN	Tactical Air Navigation Read More
TACH	Tachometer
TACOT	Tactical Operational Tool
TADIL	Tactical Distribution List
TAF	Terminal Aerodrome Forecast Read More
TAFEI	Task Analysis For Error Identification
TAI	Thermal Anti-Ice
TAIS	Total Aircraft Information System
TALT	Take off Alternate
TAM	Technical Acknowledgement Message
TAM	Transportation Acquisition Manual
TAMS	Total Airport Management System
TAP	Technical Advisory Panel
TAR	Terminal Area Radar
TARA	Traffic Advisory / Resolution Advisory Read More
TARAD	Tracking Asynchronous Radar Data
TARE	Telegraphic Automatic Relay Equipment
TAS	True Airspeed
TAS	Traffic Advisory System
TAT	Total Air Temperature
TATCA	Terminal ATC Automation
TAV	Time to Alarm Validation
TAWS	Terrain Awareness and Warning System
TAX	Taxi (ICAO)
TB	Tellback
TBA	Tellback Area
TBA	To Be Advised
TBC	To Be Confirmed
TBD	To Be Determined
TBN	To Be Notified
TBO	Time between Overhauls
TBP	To Be Provided
TBR	To Be Resolved
TBS	To Be Supplied
TBS	Telephone Back-up System
TBV	Turbine Bypass Valve
TC	True Course
TC	Transit Corridor
TC	Tropical Cyclone
TCA	Terminal Conflict Alert
TCA	Terminal Control Area
TCA	Turbine Cooling Air
TCA	Throttle Control Assy (Airbus)
TCAC	Tropical Cyclone Advisory Centre (ICAO)
TCAS	Traffic Collision Avoidance System Read More
TCC	Thrust Control Computer
TCC	Traffic Control Centre
TCC	Turbine Case Cooling (Boeing)
TCDP	Technical Control Data Processor
TCH	Threshold Crossing Height
TCI	Time Change Indicator
TCOP	Transfer Coordination Point
TCP	Transmission Control Protocol
TCPU	Touch Panel Central Processing Unit
TCS	Touch Control Steering
TCS	Temperature Control System
TCU	Towering Cumulonimbus (Meteorology)
TCU	Throttle Control Unit (Airbus)
TCWP	Threshold Crossing Way point
TDA	Track Detection Analysis
TDA	Temporary Danger Area
TDA	Today
TDB	Track Data Block
TDCE	Telephone Distribution and Control Equipment
TDCP	Test Display and Control Panel
TDD	Time Division Duplex
TDF	Total Delayed Flights
TDF	Training and Development Facility
TDL	Time Delay Logic (Boeing)
TDM	Time Division Multiplexing
TDO	Tornado
TDM	Total Delay in Minutes
TDOP	Time Dilution Of Precision
TDR	Traffic Data Record
TDR	Transponder
TDS	Testing and Development System
TDS	Technical Data Sheet (Airbus)
TDSP	Training Documentations and Special Projects
TDWR	Terminal Doppler Weather Radar
TDX	Torque Differential Transmitter
TDZ	TouchDown Zone
TDZL	TouchDown Zone Lights
TE	Time of Entry
TEC	Technical
TEC	Turbine Exhaust Case (Airbus)
TECR	Technical Reason
TEL	Telephone
TEMP	Temperature
TEMPO	Temporary / Temporarily
TEO	Engine Oil Temperature (Airbus)
TEPS	Trajectory Editor and Problem Solver
TERPS	Standard for Terminal Instrument procedures
TF	Track to a Fix
TFC	Traffic
TFIS	Traffic Flow Investigation System
TFM	Traffic Flow Management
TFR	Temporary Flight Restriction
TFTR	Terrain Following Training Route
TFV	Traffic Volume
TGF	Traffic Growth Factor
TGL	Touch and Go Landing
TGT	Target
TGT	Turbine Gas Temperature
TGS	Taxiing Guidance System
THDG	True Heading
THL	Take-off Hold Lights
THR	Threshold
THR	Thrust (Airbus)
THRL	Threshold Lights
THRU	Through
THS	Thrust (Airbus)
THS	Trimmable Horizontal Stabilizer
THSD	Thousand
TI	Transport Index
TIA	Traffic Information Area
TIA	Type Inspection Authorization
TIAS	True Indicated Airspeed
TID	Touch Input Device
TIDS	Travel Industry Designator Service
TIF	Trip Fuel
TIH	Toxic Inhalation Hazard
TIL	Until (ICAO)
TIM	Transfer Initiation Message
TIM	Travel Information Manual
TIP	Touch Input and display Panel
TIS	Time to Insert in Sequence
TIS	Traffic Information Service
TIT	Turbine inlet temperature
TIZ	Traffic Information Zone
TKE	Track Angle Error
TKOF	Take-Off
TKT	Ticket
TKTL	Ticket Time Limit
TKX	Crosstell Tracker
TL	Transition Line
TL	Transition Level
TLA	Thrust Lever Angle
TLOF	Touchdown and lift off area
TLCS	Trolley Lift & Conveyance System (Airbus)
TLPD	Traffic Load Prediction Device
TLS	Tactical Load Smoother
TLS	Target Level of Safety
TLV	Type Length Value
TLX	Task Load Index
TM	Traffic Management
TM	Transponder Mandatory
TMA	Terminal Control Area
TMA	Terminal Manoeuvre Area
TMC	Thrust Management Computer
TMCS	Technical Maintenance and Control System
TMF	Thrust Management Function
TMLB	Technical and Maintenance LogBook
TMPA	Traffic Management Program Alert
TMR	Timer (Airbus)
TMR	Tomorrow
TMRR	Temporary Minimum Disk Route
TMS	Tools Manager Server
TMS	Traffic Management System
TMS	Thrust Management System (Boeing)
TMU	Traffic Management Unit
TN	Track Number
TN	True North
TNA	Turn Altitude
TNAV	Time Navigation
TNH	Turn Height
TNT	Turbulence Near Thunderstorms
TO	Take-off
TOAC	Time of Arrival Control
TOAT	Target Off-Block Approval Time
TOBT	Target Off-Block Time
TOC	Top of Climb
TOD	Top of Descent
TODA	Take-off Distance Available
TODAH	Take-off Distance Available Helicopter
TODC	Take-off Data Calculation via ACARS
TOF	Take-off Fuel
TOGA	Take-off/Go-Around
TOGW	Take-off Gross Weight
TOI	Transitory Operation Information
TOM	Take-off Mass
TOP	Cloud Top
TOPL	Take-off Performance Limits
TORA	Take-off Run Available
TOS	Traffic Orientation Scheme
TOT	Total
TOT	Time Over Target
TOVC	Top of overcast
TOW	Take-off weight
TOWS	Take-off Warning System
TP	Turning Point
TP	True Positive
TPIS	Tire Pressure Indication System
TPDR	Transponder
TPDU	Transport Protocol Data Unit
TPL	Task Priority List
TPL	Transport Layer
TPMU	Tire Pressure Monitor Unit
TPS	Temporary Protection System (Airbus)
TPT	Touchdown Point
TR	Track (ICAO)
TR	Torque Receiver (Airbus)
TRA	Required Time for Arrival
TRA	Temporary Reserved Airspace
TRA	Thrust Reduction Altitude
TRA	Thrust Resolver Angle (Boeing)
TRACON	Terminal Radar Approach Control
TRAMON	Traffic Monitoring
TRANS	Transition / Transmit
TRB	Tracker Ball
TRC	Thermatic Rotor Control (Boeing)
TRF	Total Regulated Flights
TRI	Type Rating Instructor
TRL	Technical Readiness Level
TRL	Transition Level
TRML	Terminal
TRNG	Training
TROL	Tapeless Rotorless On Line
TROP	Tropopause (ICAO)
TRP	Thrust Rating Panel
TRPU	Thrust Reverser Power Unit (Airbus)
TRPV	Thrust Reverser Pressurizing Valve (Airbus)
TRRN	Terrain
TRSB	Time Reference Scanning Beam
TRSN	Transition
TRTO	Type Rating Training Organisation
TRU	Transformer Rectifier Unit (Airbus)
TRVL	Travel
TRY/PFL	Try Input of Planned Flight Level
TS	Thunderstorm
TSA	Temporary Segregated Area
TSAT	Target Start-Up Approval Time
TSC	Total Time Since CORE
TSAP	Transport Service Access Point
TSCU	Tower Support CWP Unit
TSD	Time Sequence Diagram
TSD	Traffic Situation Display
TSDD	Test Synthetic Dynamic Display
TSE	Total System Error
TSF	Trouble Shooting Function (Airbus)
TSFC	Trust Specific Fuel Consumption
TSGR	Thunderstorms Hail (METAR) Read More
TSI	Time Since Installation
TSM	Trouble Shooting Manual (Airbus)
TSN	Time Since New
TSO	Technical Standard Order
TSOA	Technical Standard Order Authorization
TSOH	Time Since Overhaul
TSP	Tank Signalling Processor (Airbus)
TSR	Terminal Surveillance Radar
TSR	Track Swop Rate
TSRV	Transport System Research Vehicle
TST	Trajectory Support Tool
TSTM	Thunderstorm
TSW	Thunderstorm with Snow Shower
TT	Total Temperature
TT	Total Time
TTA	Tactical Training Area
TTAF&E	Total Time Airframe & Engine
TTC	Telemetry and Telecommand Centre
TTF	Total Flights
TTF	Trend Forecast (MET)
TTG	Time To Go
TTL	Total
TTOH	Time Till Overhaul
TTOT	Target Take Off Time
TTP	TCAS II Transition Program Read More
TTR	Target Tracking Radar
TTS	Time To Station
TTS	Trim Tank System (Airbus)
TTW	Time To Waypoint
TU	Topped-up
TUC	Time of Useful Consciousness
TUM	Time Update Message
TURB	Turbulence
TVBC	Turbine Vane and Blade Cooling
TVASI / T-VASIS	“Tee” Visual Approach Slope Indicator system
TVC	Turbine Vane Cooling
TVE	Total Vertical Error
TVOR	Terminal VOR Read More
TWD	Toward
TWI	Terminal Weather Information
TWIP	Terminal Weather Information for Pilots
TWLU	Terminal Wireless LAN Unit (Airbus)
TWR	Tower control unit
TWS	Terminal Weather Service
TWT	Travelling Wave Tube
TWY	Taxiway
TWYL	Taxiway Lights
TX	Indicator for Maximum Temperature
TX	Transmitter Station
TX / RX	Transmitter / Receiver
RX	Radio Receiver
TYP	Type of Aircraft (Flight Planning & PIREPs)
TYPH	Typhoon (MET)
TRE	Type Rating Examiner
U/L	Upper / Lower Upper Link
U/S	Unserviceable (AIP)
UAB	Until Advised By (AIP)
UAC	Upper Area Control
UACC	Upper Airspace Control Centre
UAR	Upper Air Route
UAS	Unmanned Aircraft System (AIP)
UAV	Unmanned Aerial Vehicle
UBAG	Unaccompanied baggage
UBL	Unspecified Bit Rate
UCDU	Universal Control and Display Unit
UD	Upper Deck (Airbus)
UDF	Ultra High Frequency Direction Finding
UEB	Underseat Electronic Box (Airbus)
UFD	Unit Fault Data (Airbus)
UFIR	Upper Flight Information Region
UFN	Until Further Notice (AIP)
UFO	Unidentified Flying Object
UFPF	United Flight Planning and Filing
UFR	Upper Flight Region
UFTAA	United Federation of Travel Agents Associations (IATA)
UHDT	Unable Higher Due Traffic
UHF	Ultra High Frequency
UI	User Interface
UIC	Upper Information Centre
UIC	Unit Identity Code
UIMS	User Interface Management System
UL	Ultra Light Aircraft
UL	Upper Limit (AIP)
ULB	Underwater Locator Beacon (Airbus)
ULD	Unit Load Device
ULM	Ultralight Motorized Glider
ULR	Ultra Long Range (AIP)
UMA	Unmanned Aircraft
UNA	Unable (AIP)
UNAP	Unable to Approve (AIP)
UNAVBL	Unavailable
UNINC	Unusual Incidents
UNK	Unknown
UNL	Unlimited (AIP)
UNLK	Unlock (Airbus)
UNLGT	Unlighted
UNMKD	Unmarked
UNMNT	Unmonitored
UNREL	Unreliable (AIP)
UNT	Until
UNUSBL	Unusable
UPD	Update Plan Divergence
UPD	Update
UPPR	Upper (Met)
UPS	Uninterruptible Power Supply
URG	Urgency
UTA	Upper Transition Area
UTA	Upper Control Area (ICAO)
UTC	Coordinated Universal Time
UTP	Unshielded Twisted Pair
UU	Unable
UUT	Unit Under Test
UVA	Ultraviolet A Radiation
UWBS	Universal Wireless Backbone System (Airbus)
V	Velocity
V1	Take-off decision speed
V2	Minimum take-off safety speed
V3	Flap Retraction Speed
V4	Slat Retraction Speed
V/s	Vertical Speed
V/STOL	Vertical / Short Take-Off and Landing
Va	Design Maneuvering Speed
VA	Vulcanic Ash (MET)
VAAC	Volcanic ash advisory centre
VAC	Volts Alternate Current
VAC	Visual Approach and Landing Chart
VACU	Vacuum
VAL	Vertical Alert Limit
VALFAC	Validation Facility
VAP	Visual Aids Panel
VAP	Volumetric Airspace Penetration
Vapp	Final Approach Speed
VAPS	Visual Approaches
VAR	Magnetic Variation
VAR	Visual-Aural Radio Range
VAR	Variable
VAR	Variation
VASI	Visual Approach Slope Indicator
VASIS	Visual Approach Slope Indicator System
VBV	Variable Bypass Valve (Airbus)
VBX	Visual Basic Extensions
VC	Virtual Circuit
Vc	Calibrated Airspeed
VCCS	Voice Communication and Control System
VCMAX	Active Maximum Control Speed
VCMIN	Active Minimum Control Speed
VDP	Visual Descent Point
VCR	Visual Control Room
VCRI	Verification Cross Reference Index
VCS	Voice Communications System
VCSH	Showers of rain in Vicinity (METAR)
VCSS	Voice Communications Switching System
VCY	Vicinity
Vd	Design Diving Speed
VD	Heading to a DME distance
VDEV	Vertical Deviation
VDD	Version Description Document
VDF	VHF Direction Finding station
VDL	VHF Digital Link
VDOP	Vertical Dilution Of Precision
VDR	VHF Digital/Data Radio (Airbus)
VDU	Video Display Unit (Airbus)
VEL	Velocity
VENT	Ventilation
VER	Vertical
VERN	VHF Extended Range Network
VHFAMS	Very High Frequency Aeronautical Mobile Services
VESDA	Very Early Smoke Detection Apparatus
VF	Voice Frequency
Vfe	Maximum Flap Extended Speed
VFG	Variable Frequency Generator (Airbus)
VFOP	Visual Flight Rules Operations Panel
VG	Ground Velocity
VG	Vertical Gyro
DG	Directional Gyro
VG/DG	Vertical Gyro / Directional Gyro
VGND	Ground Velocity
VHCU	Versatile Heating Control Unit
VHDU	Versatile Heating Data Unit
VHF	Very High Frequency
VHRR	Very High Resolution Radiometer
VHSIC	Very High Speed Integrated Circuit
VHV	Very High Voltage
VIGV	Variable Inlet Guide Vane (Boeing)
VIS	Visibility
Vls	Lowest Selectable Airspeed
VL	Vertical Landing
VLCT	Very Large Capacity Transport
VLE	Maximum Landing Gear Extended Speed
VLF	Very Low Frequency
VLO	Maximum Landing Gear Operating Speed
VLOF	Lift-off Speed
VLR	Very Long Range
VLSI	Very Large Scale Integration
VLV	Valve (Airbus)
Vm	Maneuvering Speed
Vmin	Minimum Operating Speed
VMO	Velocity Max Operating
VNAV	VNAV Vertical Navigation
Vne	Never Exceed Speed
Vno	Maximum Structural Cruising Speed
VNSE	Vertical Navigation System Performance
VOLMET	Meteorological Information for Aircraft in Flight
VOR	VHF Omnidirectional Range Read More
VOR	Very High Frequency Omnidirectional Range Read More
VOR / DME	VHF Omni-directional Ranging / Distance Measurement Equipment
VORTAC	VHF Omnidirectional Range / Tactical Air Navigation (VOR+TACAN) Read More
VP	Vertical Profile
VPA	Vertical Path Angle
VPAE	Vertical Profile Angle Error
VPIP	Vertical Intercept Point
VR	Rotation Speed
VRB	Variable (MET)
Vref	Approach Reference Speed
VRRS	Voice Recording and Display System
VRS	Voice Response System
Vs	Stalling Speed
VSBY	Visibility
VSC	Vacuum System Controller (Airbus)
VSCS	Voice Switching and Control System
VSI	Vertical Speed Indicator Read More
VSIG	Vertical Separation Implementation Group
VSM	Vertical Separation Minimum
VSO	Stalling Speed in the Landing Configuration
VSP	Vertical Speed (VTOL)
Vsse	Safe Single-Engine Speed
VSTOL	Vertical and/or Short Take-Off and Landing
VSW	Stall Warning Speed
VSV	Variable Stator Vane
VTF	Vector to Final
VTK	Vertical Track Distance
VTOL	Vertical Take-Off and Landing
V/TRK	Vertical Track
VTS	Vacuum Toilet System
VTT	Variable Taxi Time
VTTC	Variable Taxi Time Calculation
Vu	Utility Speed
VV	Vertical visibility (METAR)
VVD	Vertical View Display
VWP	Visa Waiver Program
Vx	Best Angle of Climb Speed
Vy	Best Rate of Climb Speed
W	West
W/MOD	With Modification of Vertical Profile
W/STEP	With Step Change in Altitude
WAAS	Wide Area Augmentation System
WABSIC	Wheel And Brake System Integrated Component
WAC	World Aeronautical Chart
WACS	Wireless Airport Communications Systems
WADGPS	Wide Area Differential GPS
WAFC	World Area Forecast Centre
WAGS	Windshear Alert and Guidance System
WAI	Wing Anti-Ice (Airbus)
WARP	Weather and Radar Processor
WB	Westbound
W&B	Weight and Balance
WBA	Weight and Balance Application
WBAR	Wing Bar Lights
WBBC	Weight and Balance Backup Computation (Airbus)
WBC	Weight and Balance Computer
WBM	Weight & Balance Manual (Boeing)
WBS	Weight and Balance System
WCO	World Customs Organization
WDI	Wind Direction Indicator
WDSPR	Widespread
WDW	Window
WET	Wet Cargo
WET	Wet Runway
WEU	Warning Electronic Unit
WGD	Windshield Guidance Display
WID	Width
WX	Weather
WILAD	Will Advise
WILCO	Will Comply
WINDMG	Wind Magnitude
WIP	Work in Progress (ICAO)
WIRS	Wide Area Reference Stations
WIW	Water Injection Weight
WK	Week
WKDAYS	Monday through Friday
WKEND	Saturday and Sunday
WKN	Weaken / Weakening
WLA	WorkLoad Assessment
WLG	Wing Landing Gear
WNW	West Nort West
WOW	Weight On Wheels
WPT	Way point
WRM	Warm
WRNG	Warning
WRS	Worse (Meteorology)
WS	Wind Shear
WSPD	Wind Speed
WSR	Wet Snow on Runways
WSW	West South West
WT	Weight
WTB	Wing Tip Brake (Airbus)
WTC	Wake Turbulence Category
WTF	Wing Tank Fuel
WTSPT	Waterspout
WTR	Water on Runway
WTWS	Windshear and Turbulence Warning System
WV	Water vapor
WX DEV	Weather Deviation
WXMS	Weather Mapping System
WXR	Weather Radar
XBAG	Excess Baggage
XBAR	Crossbar of an approach lighting system
XCHECK	Crosscheck
XCM	Crossing Request Cancellation Message
XCOORD	Cancel Coordination
XCOP	Exit Coordination Point
XCOR	Cancel Correlation
XCVR	Transceiver
XFL	Exit Flight Level
XFR	Transfer
XFRQ	Cancel Frequency message
XHOLD	Cancel Hold
XIFL	Cancel Intermediate Flight Level
XIN	Crossing intentions
XM	External Master
XMET	Cancel METAR
XMIT	Transmit
XMITR	Transmitter
XNG	Crossing
XTRK	Cross Track Error
XPD	Transponder
XPDR	Transponder
XPLN	Cancel Plan
XPT	Exit Point
XRQ	Airspace Crossing Request Message
XS	Atmospherics
XSFL	Cancel Supplementary Flight Level
XTK	Cross Track Distance
XTK	Crosstrack
XTRK	Cancel Track
XX	Cancel status
YCZ	Yellow Caution Zone
YD	Yaw Damper
YDA	Yesterday
YSAS	Yaw Stability Augmentation System
ZFCG	Zero Fuel Center of Gravity
ZFM	Zero Fuel Mass
ZFW	Zero Fuel Weight
ZOC	Zone of Convergence
Zp	Pressure Altitude
ZFTT	Zero Flight Time Training
A	Alpha
B	Bravo
C	Charlie
D	Delta
E	Echo
F	Foxtrot
G	Golf
H	Hotel
I	India
J	Juliet
K	Kilo
L	Lima
M	Mike
N	November
O	Oscar
P	Papa
Q	Quebec
R	Romio
S	Sierra
T	Tango
U	Uniform
V	Victor
W	Whiskey
X	X-Ray
Y	Yankee
Z	Zulu

Aviation Acronym & Abbreviation Directory

This directory contains over 3,800 acronyms, abbreviations, and codes used across FAA, ICAO, and EASA regulations, air traffic control phraseology, and flight training manuals.

Use the search bar above to look up any term by its acronym or definition. It covers standard weather reporting (METAR, TAF, PIREP), navigation aids (VOR, ILS, DME), flight rules, NOTAMs, and general ground school terminology.

If you run into an outdated definition or notice a missing abbreviation while studying, feel free to drop a message through our contact page so we can update the database.