GEN 2.2  Abbreviations Used in AIS Publications

Abbreviations marked by an asterisk (*) are either different from or not contained in ICAO Doc 8400.

A - A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
AAmber
A*Ampere
A/AAir-to-air
A/GAir-to-ground
AAA(or AAB, AAC, etc. in sequence) Amended meteorological message (message type designator)
AADAssigned altitude deviation
AAIMAircraft autonomous integrity monitoring
AALAbove aerodrome level
AARAir to air refuelling
ABIAdvance boundary information
ABMAbeam
ABNAerodrome beacon
ABTAbout
ABVAbove
ACAltocumulus
ACARSAircraft communication addressing and reporting system
ACASAirborne collision avoidance system
ACCArea control centre or area control
ACCIDNotification of an aircraft accident
ACFTAircraft
ACIDAircraft identification
ACKAcknowledge
ACLAltimeter check location
ACL*ATC clearances and instructions
ACM*ATC Communications Management
ACNAircraft classification number
ACPAcceptance (message type designator)
ACPTAccept or accepted
ACTActive or activated or activity
ACU*Air control unit
ADAerodrome
ADAAdvisory area
ADCAerodrome chart
ADC*Air defence controller
ADDNAddition or additional
ADEP*Airport of departure
ADES*Airport of destination
ADFAutomatic direction-finding equipment
ADIZAir defence identification zone
ADJAdjacent
ADOAerodrome office (specify service)
ADP*Automatic data processing
ADRAdvisory route
ADSThe address [when this abbreviation is used to request a repetition, the question mark (IMI) precedes the abbreviation, e.g. IMI ADS] (to be used in AFS as a procedure signal)
ADS-BAutomatic dependent surveillance - broadcast
ADS-CAutomatic dependent surveillance - contract
ADSUAutomatic dependent surveillance unit
ADVSAdvisory service
ADZAdvise
AESAircraft earth station
AFILFlight plan filed in the air
AFISAerodrome flight information service
AFIZ*Aerodrome flight information zone
AFMYes or affirm or affirmative or that is correct
AFSAeronautical fixed service
AFTAfter . . . (time or place)
AFTNAeronautical fixed telecommunication network
AGAAerodromes, air routes and ground aids
AGLAbove ground level
AGNAgain
AICAeronautical information circular
AIDCAir traffic services interfacility data communication
AIM*ATFM information message
AIMAeronautical Information Management
AIPAeronautical information publication
AIRACAeronautical information regulation and control
AIREPAir-report
AIRMETInformation concerning en-route weather phenomena which may affect the safety of low-level aircraft operations
AIRPROX*Aircraft proximity
AISAeronautical Information Services
ALAAlighting area
ALERFAAlert phase
ALO*Air Liaison Officer
ALRAlerting (message type designator)
ALRSAlerting service
ALSApproach lighting system
ALTAltitude
ALTNAlternate or alternating (light alternates in colour)
ALTNAlternate (aerodrome)
AMAArea minimum altitude
AMC*Airspace Management Cell
AMC*ATC microphone check
AMDAmend or amended (used to indicate amended meteorological message; message type designator)
AMDTAmendment (AIP amendment)
AMHS*ATS message handling system
AMO*Aerodrome Meteorological Office
AMSAeronautical mobile service
AMSLAbove mean sea level
AMSSAeronautical mobile satellite service
ANA*Administration de la navigation aérienne
ANCAeronautical chart - 1:500 000 (followed by name/title)
ANCSAeronautical navigation chart - small scale (followed by name/title and scale)
ANM*ATFM notification message
ANSAnswer
AOAircraft Operator
AOCAerodrome obstacle chart (followed by type and name/title)
APAirport
APAPIAbbreviated precision approach path indicator
APCHApproach
APDCAircraft parking/docking chart (followed by name/title)
APNApron
APPApproach control office or approach control or approach control service
APRApril
APRXApproximate or approximately
APSGAfter passing
APUAuxiliary power unit
APVApproach procedure with vertical guidance
AR*Authorization required
ARCArea chart
ARES*Airspace reservation
ARNGArrange
AROAir traffic services reporting office
ARPAerodrome reference point
ARPAir-report (message type designator)
ARQAutomatic error correction
ARRArrival (message type designator)
ARRArrive or arrival
ARSSpecial air-report (message type designator)
ARSTArresting [specify (part of) aircraft arresting equipment]
ASAltostratus
ASAPAs soon as possible
ASCAscend to or ascending to
ASDAAccelerate-stop distance available
ASEAltimetry system error
ASHTAMSpecial series of NOTAM notifying, by means of a specific format, change in activity of a volcano, a volcanic eruption and/or volcanic ash cloud that is of significance to aircraft operations
ASPHAsphalt
ASR*Aerodrome surveillance radar
ATAt (followed by time at which weather change is forecast to occur)
AT-VASISAbbreviated T visual approach slope indicator system
ATAActual time of arrival
ATCAir traffic control (in general)
ATCC*Air traffic control centre (military abbreviation)
ATCSMACAir traffic control surveillance minimum altitude chart (followed by name/title)
ATDActual time of departure
ATFCMAir traffic flow and capacity management
ATFMAir traffic flow management
ATISAutomatic terminal information service
ATMAir traffic management
ATNAeronautical telecommunication network
ATPAt . . . (time or place)
ATSAir traffic services
ATTNAttention
ATZAerodrome traffic zone
AUGAugust
AUP*Airspace Use Plan
AUTHAuthorized or authorization
AUTOAutomatic
AUWAll up weight
AUXAuxiliary
AVBLAvailable or availability
AVGAverage
AVGASAviation gasoline
AWOSAutomatic Weather Observation System
AWTAAdvise at what time able
AWYAirway
AZMAzimuth
B - A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
BBlue
BABraking action
BARO-VNAVBarometric vertical navigation
BASECloud base
BCFGFog patches
BCNBeacon (aeronautical ground light)
BCSTBroadcast
BDRYBoundary
BECMGBecoming
BFRBefore
BKNBroken
BLBlowing (followed by DU = dust, SA = sand or SN = snow)
BLDGBuilding
BLOBelow clouds
BLWBelow . . .
BOMBBombing
BRMist
BRFShort (used to indicate the type of approach desired or required)
BRGBearing
BRKGBraking
BSCommercial broadcasting station
BTLBetween layers
BTNBetween
BUFRBinary universal form for the representation of meteorological data
C - A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
CCentre (runway identification)
CDegrees Celsius (centigrade)
CACourse to an altitude
CAACivil Aviation Authority or Civil Aviation Administration
CANAC*Computer Assisted National Air traffic control Centre
CAS*Close Air Support
CATCategory
CATClear air turbulence
CAVOKVisibility, cloud and present weather better than prescribed values or conditions
CBCumulonimbus
CBA*Cross-border area
CCCirrocumulus
CCA(or CCB, CCC, etc. in sequence) Corrected meteorological message (message type designator)
CCOContinuous climb operations
CCTV*Closed circuit television
CDCandela
CDNCo-ordination (message type designator)
CDOContinuous descent operations
CDRConditional route
CENOR*Central and Northern region (an organisaton of NATO nations that developed specifications for aeronautical charts for the use of MIL crew)
CEU*Central executive unit
CFChange frequency to . . .
CFCourse to a fix
CFIT*Controlled flight into terrain
CFMConfirm or I confirm (to be used in AFS as a procedure signal)
CGLCircling guidance light(s)
CHChannel
CHEMChemical
CHGModification (message type designator)
CICirrus
CIDINCommon ICAO data interchange network
CIVCivil
CKCheck
CLCentre line
CLAClear type of ice formation
CLBRCalibration
CLDCloud
CLGCalling
CLIMB-OUTClimb-out area
CLRClear(s) or cleared to . . . or clearance
CLRDRunway(s) cleared (used in METAR/SPECI)
CLSDClose or closed or closing
CMCentimetre
CMBClimb to or climbing to
CMPLCompletion or completed or complete
CNLCancel or cancelled
CNLFlight plan cancellation (message type designator)
CNSCommunications, navigation and surveillance
COMCommunications
COMOPSAIR*Commando Air Operations
CONCConcrete
CONDCondition
CONSContinuous
CONSTConstruction or constructed
CONTContinue(s) or continued
COORCoordinate or coordination
COORDCoordinates
COPChange-over point
CORCorrect or correction or corrected (used to indicate corrected meteorological message; message type designator)
COTAt the coast
COVCover or covered or covering
CPDLCController-pilot data link communications
CPLCurrent flight plan (message type designator)
CRCCyclic redundancy check
CRC*Control and reporting centre
CRMCollision risk model
CRNA*Centre en Route de la Navigation Aérienne
CRPCompulsory reporting point
CRZCruise
CSCall sign
CSCirrostratus
CSAR*Combat search and rescue
CTAControl area
CTAMClimb to and maintain
CTCContact
CTLControl
CTNCaution
CTOT*Calculated take-off time
CTRControl zone
CUCumulus
CUFCumuliform
CUSTCustoms
CVRCockpit voice recorder
CWContinuous wave
CWYClearway
D - A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
DDownward (tendency in RVR during previous 10 minutes)
DDanger area (followed by identification)
D-ATISData link automatic terminal information service
D-FIS*Data link flight information service
D-VOLMETData link VOLMET
DADecision altitude
DAT*Significant data related to data link capability
dB*Decibel
DCDDouble channel duplex
DCKGDocking
DCL*Data link clearance delivery service
DCPDatum crossing point
DCPCDirect controller-pilot communications
DCSDouble channel simplex
DCTDirect (in relation to flight plan clearances and type of approach)
DEFrom (used to precede the call sign of the calling station; to be used in AFS as a procedure signal)
DECDecember
DEGDegrees
DEPDepart or departure
DEPDeparture (message type designator)
DEPO Deposition
DERDeparture end of the runway
DESDescend to or descending to
DESTDestination
DETRESFADistress phase
DEVDeviation or deviating
DFDirection finding
DFDRDigital flight data recorder
DFTIDistance from touchdown indicator
DGS*Docking guidance system
DHDecision height
DIFDiffuse
DISTDistance
DIVDivert or diverting
DLADelay or delayed
DLADelay (message type designator)
DLICData link initiation capability
DLYDaily
DMEDistance measuring equipment
DNGDanger or dangerous
DOC*Designated operational coverage
DOFDate of flight
DOMDomestic
DPDew point temperature
DPM*Motorized deltaplane
DPTDepth
DRDead reckoning
DRLow drifting (followed by DU = dust, SA = sand or SN = snow)
DRGDuring
DSDuststorm
DSBDouble sideband
DTAMDescend to and maintain
DTGDate-time group
DTHRDisplaced runway threshold
DTRTDeteriorate or deteriorating
DTWDual tandem wheels
DUDust
DUCDense upper cloud
DUPEThis is a duplicate message (signal for use in the tele-typewriter service only; to be used in AFS as a procedure signal)
DURDuration
DVORDoppler VOR
DWDual wheels
DZDrizzle
E - A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
EEast or eastern longitude
eAIP*Electronic aeronautical information publication
EATExpected approach time
EAUP*European airspace use plan
EAW*Early access weekend routes
EBEastbound
ECAC*European Civil Aviation Conference
EDAElevation differential area
EDTOExtended diversion time operations
EEEError (signal for use in the teletypewriter service only; to be used in AFS as a procedure signal)
EETEstimated elapsed time
EFCExpect further clearance
EFISElectronic flight instrument system
EGNOSEuropean geostationary navigation overlay service
EHFExtremely high frequency (30 000 to 300 000 MHZ)
EHSEnhanced surveillance
ELBAEmergency location beacon - aircraft
ELEVElevation
ELRExtra long range
ELSElementary surveillance
ELTEmergency locator transmitter
EMEmission
EMBDEmbedded in a layer (to indicate cumulonimbus embedded in layers of other clouds)
EMERGEmergency
En*English
ENDStop-end (related to RVR)
ENEEast-north-east
ENGEngine
ENREn-route
ENRCEn-route chart (followed by name/title)
EOBTEstimated off block time
EQPTEquipment
ESA*Emergency safety altitude
ESEEast-south-east
ESTEstimate or estimated or estimate (message type designator)
EST*Estimated (preceded by time-group)
ETAEstimated time of arrival or estimating arrival
ETDEstimated time of departure or estimating departure
ETOEstimated time over significant point
ETOT*Estimated take-off time
EUR RODEXEuropean regional OPMET data exchange
EUROAT*Eurocontrol harmonised rules for operational air traffic
EUUP*European updated airspace use plan
EVEvery
EVS Enhanced vision system
EXCExcept
excl*Excluded
EXERExercises or exercising or to exercise
EXP*Expect or expected or expecting
EXTDExtend or extending or extended
F - A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
FFixed
FACourse from a fix to an altitude
FAC*Facilities
FAFFinal approach fix
FALFacilitation of international air transport
FANS*Future air navigation system
FAPFinal approach point
FASFinal approach segment
FASID*Facilities and Services Implementation Document
FATOFinal approach and take-off area
FAXFacsimile transmission
FBLLight (used to indicate the intensity of weather phenomena, interference or static reports, e.g. FBL RA = light rain)
FCFunnel cloud (tornado or water spout)
FCSTForecast
FCTFriction coefficient
FDPSFlight data processing system
FEBFebruary
FEWFew
FGFog
FICFlight information centre
FIRFlight information region
FISFlight information service
FISAAutomated flight information service
FLFlight level
FLDField
FLGFlashing
FLRFlares
FLTFlight
FLTCKFlight deck
FLUCFluctuating or fluctuation or fluctuated
FLWFollow(s) or following
FLYFly or flying
FMCourse from a fix to manual termination (used in navigation database coding)
FMFrom
FMFrom (followed by time weather change is forecast to begin)
FMCFlight management computer
FMP*Flow management position
FMSFlight management system
FMUFlow management unit
FNAFinal approach
FOD*Foreign object damage
FPAPFlight path alignment point
FPLFlight plan
FPMFeet per minute
FPRFlight plan route
FPS*Federal Public Service
FRFuel remaining
Fr*French
FRA*Free route airspace
FREQFrequency
FRIFriday
FRNGFiring
FRONTFront (relating to weather)
FROSTFrost (used in aerodrome warnings)
FRQFrequent
FSLFull stop landing
FSSFlight service station
FSTFirst
FTFeet (dimensional unit)
FTEFlight technical error
FTPFictitious threshold point
FTTFlight technical tolerance
FUSmoke
FZFreezing
FZDZFreezing drizzle
FZFGFreezing fog
FZRAFreezing rain
G - A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
G*Gram
GGreen
GVariations from the mean wind speed (gusts) (used in METAR/SPECI and TAF)
G/AGround-to-air
G/A/GGround-to-air and air-to-ground
GAGo ahead, resume sending (to be used in AFS as a procedure signal)
GAGeneral Aviation
GAGANGPS and geostationary earth orbit augmented navigation
GAINAirspeed or headwind gain
GAMETArea forecast for low-level flights
GARPGBAS azimuth reference point
GAT*General air traffic
GBASGround-based augmentation system
GCAGround controlled approach system or ground controlled approach
Ge*German
GENGeneral
GEOGeographic or true
GESGround earth station
GLDGlider
GLONASSGlobal orbiting navigation satellite system
GLSGBAS landing system
GMCGround movement chart (followed by name/title)
GNDGround
GNDCKGround check
GNSSGlobal navigation satellite system
GOVGovernment
GPGlide path
GPAGlide path angle
GPIPGlide path intercept point
GPSGlobal positioning system
GPUGround power unit
GPWSGround proximity warning system
GRHail
GRASGround-based regional augmentation system
GRASSGrass landing area
GRIBProcessed meteorological data in the form of grid point values expressed in binary form (aeronautical meteorological code)
GRVLGravel
GSGround speed
GSSmall hail and/or snow pellets
GSM*Global System for Mobile Communications
GUNDGeoid undulation
H - A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
HHigh pressure area or the centre of high pressure
H...Significant wave height (followed by figures in METAR/SPECI)
H24Continuous day and night service
HAHolding/racetrack to an altitude
HAPIHelicopter approach path indicator
HBNHazard beacon
HCHHelicopter crossing height
HDFHigh frequency direction-finding station
HDGHeading
HELHelicopter
HEMS*Helicopter emergency medical service
HFHigh frequency (3 000 to 30 000 KHZ)
HFHolding/racetrack to a fix
HFDL*High frequency data link
HGTHeight or height above
HJSunrise to sunset
HLDGHolding
HLPHeliport
HLSHelicopter landing site
HMHolding/racetrack to a manual termination
HNSunset to sunrise
HOService available to meet operational requirements
HOLHoliday
HOSPHospital aircraft
HPAHectopascal
HRHours
HRPHeliport reference point
HSService available during hours of scheduled operations
HT*High tension
HTA*Helicopter training area
HUDHead-up display
HUMHumanitarian
HURCNHurricane
HVDFHigh and very high frequency direction-finding stations (at the same location)
HVYHeavy
HVYHeavy (used to indicate the intensity of weather phenomena, e.g. HVY RA = heavy rain)
HXNo specific working hours
HYRHigher
HZHaze
HZHertz (cycles per second)
I - A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
IACInstrument approach chart (followed by name/title)
IAFInitial approach fix
IAOIn and out of clouds
IAPInstrument approach procedure
IARIntersection of air routes
IASIndicated airspeed
IATA*International Air Transport Association
IBNIdentification beacon
ICAOInternational Civil Aviation Organization
ICEIcing
IDIdentifier or identify
IDENTIdentification
IFIntermediate approach fix
IFFIdentification friend/foe
IFPS*Integrated Initial Flight Plan Processing System
IFPU*Integrated Initial Flight Plan Processing Unit
IFRInstrument flight rules
IGAInternational general aviation
ILSInstrument landing system
IMInner marker
IMCInstrument meteorological conditions
IMGImmigration
IMIInterrogation sign (question mark) (to be used in AFS as a procedure signal)
IMPRImprove or improving
IMTImmediate or immediately
INAInitial approach
INBDInbound
INCIn cloud
INCERFAUncertainty phase
incl*Included
INCORPIncorporated
INFOInformation
INOPInoperative
INPIf not possible
INPRIn progress
INSInertial navigation system
INSTLInstall or installed or installation
INSTRInstrument
INTIntersection
INTLInternational
INTRGInterrogator
INTRPInterrupt or interruption or interrupted
INTSFIntensify or intensifying
INTSTIntensity
IRIce on runway
IRM*Institut Royal Météorologique de Belgique
IRSInertial reference system
IRU*Inertial reference unit
ISAInternational standard atmosphere
ISBIndependent sideband
ISOLIsolated
J - A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
JAA*Joint Aviation Authorities
JANJanuary
JTSTJet stream
JULJuly
JUNJune
K - A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
KGKilograms
KHZKilohertz
KIASKnots indicated airspeed
KMKilometres
KMHKilometres per hour
KMI*Koninklijk Meteorologisch Instituut
KPAKilopascal
KTKnots
kVA*Kilovolt-ampere
KWKilowatts
L - A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
LLeft (runway identification)
LLocator (see LM, LO)
LLow pressure area or the centre of low pressure
LLitre
LAMLogical acknowledgement (message type designator)
LANInland
LATLatitude
LB*Pounds
LCALocal or locally or location or located
LCN*Load classification number
LCTA*Lower control area
LDALanding distance available
LDAHLanding distance available, helicopter
LDGLanding
LDILanding direction indicator
LENLength
LFLow frequency (30 to 300 KHZ)
LFA*Low flying area
LGTLight or lighting
LGTDLighted
LIHLight intensity high
LILLight intensity low
LIMLight intensity medium
LINELine (used in SIGMET)
LLFC*Low level forecast chart
LMLocator, middle
LMTLocal mean time
LNAVLateral navigation
LNGLong (used to indicate the type of approach desired or required)
LOLocator, outer
LOCLocalizer
LONGLongitude
LORANLong range air navigation system
LOSS Airspeed or headwind loss
LPVLocalizer performance with vertical guidance
LRThe last message received by me was . . .(to be used in AFS as a procedure signal)
LRGLong range
LSThe last message sent by me was . . . or Last message was . . .(to be used in AFS as a procedure signal)
LSA*Light sport aircraft
LT*Left turn
LTALower control area
LTDLimited
LTPLanding threshold point
Lu*Luxembourgish
LVLight and variable (relating to wind)
LVELeave or leaving
LVLLevel
LVPLow visibility procedures
LYRLayer or layered
M - A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
MIndicator for minimum value of runway visual range (used in the METAR/SPECI code forms)
MMach number (followed by figures)
MMetres (preceded by figures)
MAAMaximum authorized altitude
MAGMagnetic
MAHFMissed approach holding fix
MAINTMaintenance
MAN*Manual
MAPAeronautical maps and charts
MAPTMissed approach point
MARMarch
MARAt sea
MARSA*Military authority assumes responsibility for separation of aircraft
MATFMissed approach turning fix
MATZMilitary aerodrome traffic zone
MAXMaximum
MAYMay
MBSTMicroburst
MCAMinimum crossing altitude
MCTRMilitary control zone
MCWModulated continuous wave
MDAMinimum descent altitude
MDC*Military Detachment for Co-ordination
MDFMedium frequency direction-finding station
MDHMinimum descent height
MEAMinimum en-route altitude
MEDEVACMedical evacuation flight
MEHTMinimum eye height over threshold (for visual approach slope indicator systems)
METMeteorological or meteorology
MET REPORTLocal routine meteorological report (in abbreviated plain language)
METARAviation routine weather report (in aeronautical meteorological code)
MFMedium frequency (300 to 3 000 KHZ)
MHAMinimum holding altitude
MHDFMedium and high frequency direction-finding stations (at the same location)
MHVDFMedium, high and very high frequency direction-finding stations (at the same location)
MHZMegahertz
MIDMid-point (related to RVR)
MIFGShallow fog
MILMilitary
MILFAG*Military Low Flying Area Golf
MINMinutes
MISMissing . . . (transmission identification; to be used in AFS as a procedure signal)
MJ*Megajoule
MKRMarker radio beacon
MLSMicrowave landing system
MLW*Maximum landing weight
MMMiddle marker
MM*millimetre
MNMMinimum
MNPSMinimum navigation performance specifications
MNTMonitor or monitoring or monitored
MNTNMaintain
MOAMilitary operating area
MOCMinimum obstacle clearance (required)
MOCAMinimum obstacle clearance altitude
MODModerate (used to indicate the intensity of weather phenomena, interference or static reports, e.g. MOD RA = moderate rain)
MONAbove mountains
MONMonday
MOPSMinimum operational performance standards
MOPSC*Maximum operational passenger seating configuration
MOVMove or moving or movement
MPH*Statute miles per hour
MPSMetres per second
MRAMinimum reception altitude
MRGMedium range
MRPATS/MET reporting point
MSMinus
MSAMinimum sector altitude
MSASMulti-functional transport satellite (MTSAT) satellite-based augmentation system
MSAWMinimum safe altitude warning
MSC*Mission Support Centre
MSGMessage
MSLMean sea level
MSRMessage . . . (transmission identification) has been misrouted (signal for use in the teletypewriter service only; to be used in AFS as a procedure signal)
MSSRMonopulse secondary surveillance radar
MTMountain
MTOMMaximum take-off mass
MTOW*Maximum authorized take-off weight
MTUMetric units
MTWMountain waves
MVDFMedium and very high frequency direction-finding stations (at the same location)
MWOMeteorological watch office
MXMixed type of ice formation (white and clear)
N - A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
N*Newton
NNo distinct tendency (in RVR during previous 10 minutes)
NNorth or northern latitude
NADPNoise abatement departure procedure
NASCNational AIS system centre
NATNorth Atlantic
NATO*North Atlantic Treaty Organisation
NAVNavigation
NAVAIDNavigation aid
NBNorthbound
NBFRNot before
NCNo change
NCDNo cloud detected (used in automated METAR/SPECI)
NDBNon-directional radio beacon
NDVNo directional variations available (used in automated METAR/SPECI)
NENorth-east
NEBNorth-eastbound
NEGNo or negative or permission not granted or that is not correct
NGTNight
NILNone or I have nothing to send to you
Nl*Dutch
NMNautical miles
NMLNormal
NNNo name, unnamed
NNENorth-north-east
NNWNorth-north-west
NONo (negative; to be used in AFS as a procedure signal)
NOFInternational NOTAM office
NONSTDNon-standard
NOSIGNo significant change (used in trend-type landing forecasts)
NOTAMA notice distributed by means of telecommunication containing information concerning the establishment, condition or change in any aeronautical facility, service, procedure or hazard, the timely knowledge of which is essential to personnel concerned with flight operations
NOTAMCCancelling NOTAM
NOTAMNNew NOTAM
NOTAMRReplacing NOTAM
NOVNovember
NOZNormal operation zone
NPANon precision approach
NRNumber
NRHNo reply heard
NSNimbostratus
NSCNil significant cloud
NSENavigation system error
NSWNil significant weather
NTLNational
NTZNo transgression zone
NWNorth-west
NWBNorth-westbound
NXTNext
O - A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
O/ROn request
OACOceanic area control centre
OASObstacle assessment surface
OAT*Operational air traffic
OBSObserve or observed or observation
OBSCObscure or obscured or obscuring
OBSTObstacle
OCAOceanic control area
OCAObstacle clearance altitude
OCCOcculting (light)
OCHObstacle clearance height
OCNLOccasional or occasionally
OCSObstacle clearance surface
OCTOctober
OFZObstacle free zone
OGNOriginate (to be used in AFS as a procedure signal)
OHDOverhead
OISObstacle identification surface
OKWe agree / it is correct (to be used in AFS as a procedure signal)
OLDIOn-line data interchange
OMOuter marker
OPAOpaque, white type of ice formation
OPCControl indicated is operational control
OPMETOperational meteorological (information)
OPNOpen or opening or opened
OPROperator or operate or operative or operating or operational
OPSOperations
ORCAM*Originating region code assignment method
ORDOrder
OSVOcean station vessel
OTPOn top
OTSOrganized track system
OUBDOutbound
OVCOvercast
P - A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
PIndicator for maximum value of wind speed or runway visual range (used in the METAR/SPECI and TAF code forms)
PProhibited area (followed by identification)
PAPrecision approach
PALSPrecision approach lighting system (specify category)
PANSProcedures for air navigation services
PAPIPrecision approach path indicator
PARPrecision approach radar
PARLParallel
PATCPrecision approach terrain chart (followed by name/title)
PAXPassenger(s)
PBCPerformance-based communication
PBNPerformance-based navigation
PBSPerformance-based surveillance
PCDProceed or proceeding
PCLPilot-controlled lighting
PCNPavement classification number
PCTPer cent
PDCPre-departure clearance
PDGProcedure design gradient
PERPerformance
PERMPermanent
PFOPermanent flying order
PIBPre-flight information bulletin
PJEParachute jumping exercise
PLIce pellets
PL*Plain language
PLAPractice low approach
PLVLPresent level
PNPrior notice required
PNRPoint of no return
PODust/sand whirls (dust devils)
POBPersons on board
POSSPossible
PPIPlan position indicator
PPRPrior permission required
PPSNPresent position
PRFGAerodrome partially covered by fog
PRIPrimary
PRKGParking
PROBProbability
PROCProcedure
PROPPropeller
PROVProvisional
PRPPoint-in-space reference point
PSPlus
PSGPassing
PSI*Pounds per square inch
PSNPosition
PSPPierced steel plank
PSRPrimary surveillance radar
PSYSPressure system(s)
PTNProcedure turn
PTSPolar track structure
PWRPower
Q - A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
QC*Quota count
QDMMagnetic heading (zero wind)
QDRMagnetic bearing
QFEAtmospheric pressure at aerodrome elevation (or at runway threshold)
QFUMagnetic orientation of runway
QNHAltimeter sub-scale setting to obtain elevation when on the ground
QRA*Quick reaction alert
QTETrue bearing
QUADQuadrant
R - A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
RRate of turn
RRunway (used in the METAR/SPECI code forms)
RRed
RRight (runway identification)
RReceived (acknowledgement of receipt; to be used in AFS as a procedure signal)
RRestricted area (followed by identification)
RRadial from VOR (followed by three figures)
RARain
RAResolution advisory
RACRules of the air and air traffic services
RAD*Route availability document
RAGRagged
RAGRunway arresting gear
RAIRunway alignment indicator
RAIMReceiver autonomous integrity monitoring
RASCRegional AIS system centre
RASSRemote altimeter setting source
RBRescue boat
RCAReach cruising altitude
RCCRescue co-ordination centre
RCFRadiocommunication failure (message type designator)
RCHReach or reaching
RCLRunway centre line
RCLLRunway centre line light(s)
RCLRRecleared
RCPRequired communication performance
RDHReference datum height (for ILS)
RDLRadial
RDORadio
RDOACTRadioactive
RERecent (used to qualify weather phenomena, e.g. RERA = recent rain)
RECReceive or receiver
REDLRunway edge light(s)
REFReference to . . . or refer to . . .
REGRegistration
REJ*Rejected
RENLRunway end light(s)
REPReport or reporting or reporting point
REQRequest or requested
RERTERe-route
RESARunway end safety area
RETIL*Rapid exit taxiway indicator lighting
RFConstant radius arc to a fix
RFF*Rescue and fire fighting
RFFSRescue and fir fighting services
RFP*Replacement flight plan (related to ATFM)
RGRange (lights)
RHCRight-hand circuit
RIFReclearance in flight
RIMERime (used in aerodrome warnings)
RIS*Radar Information service
RLReport leaving
RLARelay to
RLCERequest level change en route
RLLSRunway lead-in lighting system
RLNARequest level not available
RMKRemark
RMZ*Radio mandatory zone
RNAVArea navigation
RNGRadio range
RNPRequired navigation performance
ROBEXRegional OPMET bulletin exchange (scheme)
ROCRate of climb
RODRate of descent
RONReceiving only
RPA*Remotely piloted aircraft
RPAS*Remotely piloted aircraft system
RPDSReference path data selector
RPIRadar position indicator
RPLRepetitive flight plan
RPLCReplace or replaced
RPSRadar position symbol
RPTRepeat / I repeat (to be used in AFS as a procedure signal)
RQIndication of a request (to be used in AFS as a procedure signal)
RQMNTSRequirements
RQPRequest flight plan (message type designator)
RQSRequest supplementary flight plan (message type designator)
RRReport reaching
RRA(or RRB, RRC, etc. in sequence) Delayed meteorological message (message type designator)
RSCRescue sub-centre
RSCDRunway surface condition
RSPRequired surveillance performance
RSPResponder beacon
RSREn-route surveillance radar
RSSRoot sum square
RT*Right turn
RTDDelayed (used to indicate delayed meteorological message; message type designator)
RTERoute
RTFRadiotelephone
RTGRadiotelegraph
RTHLRunway threshold light(s)
RTNReturn or returned or returning
RTODAHRejected take-off distance available, helicopter
RTSReturn to service
RTTRadioteletypewriter
RTZLRunway touchdown zone light(s)
RUTStandard regional route transmitting frequencies
RVRescue vessel
RVARadar vectoring area
RVRRunway visual range
RVSM*Reduced vertical separation minimum
RWYRunway
S - A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
SIndicator for state of the sea (used in the METAR/SPECI code forms)
SSouth or southern latitude
SASand
SALSSimple approach lighting system
SAM*Slot allocation message
SANSanitary
SARSearch and rescue
SARPSStandards and Recommended Practices (ICAO)
SATSaturday
SATCOMSatellite communication (used only when referring generally to both voice and data satellite communication or only data satellite communication)
SATVOICESatellite voice communication
SBSouthbound
SBASSatellite-based augmentation system
SCStratocumulus
SCTScattered
SDStandard deviation
SDBYStand by
SDFStep down fix
SESouth-east
SEASea (used in connection with sea-surface temperature and state of the sea)
SEBSouth-eastbound
SECSeconds
SECNSection
SECTSector
SELCALSelective calling system
SEPSeptember
SERService or servicing or served
SEVSevere (used e.g. to qualify icing and turbulence reports)
SFCSurface
SFOSimulated flame out
SGSnow grains
SGLSignal
SHShowers (followed by RA = rain, SN = snow, PL = ice pellets, GR = hail, GS = small hail and/or snow pellets or combinations thereof, e.g. SHRASN = showers of rain and snow)
SHFSuper high frequency (3 000 to 30 000 MHZ)
SIInternational system of units
SIDStandard instrument departure
SIFSelective identification feature
SIGSignificant
SIGMETInformation concerning en-route weather and other phenomena in the atmosphere that may affect the safety of aircraft operations
SIGWX*Significant weather
SIMULSimultaneous or simultaneously
SITA*Sociéte Internationale des Télécommunications Aéronautique
SIWLSingle isolated wheel load
SKEDSchedule or scheduled
SLPSpeed limiting point
SLWSlow
SMCSurface movement control
SMRSurface movement radar
SNSnow
SNOCLOIndicator for the aerodrome being closed due to snow on the runway (used in the METAR/SPECI code forms)
SNOWTAMA special series NOTAM notifying the presence or removal of hazardous conditions due to snow, ice, slush or standing water associated with snow, slush and ice on the movement area, by means of a specific format
SOCStart of climb
SOF*Supervisor of flights
SPECIAviation selected special weather report (in aeronautical meteorological code)
SPECIALSpecial meteorological report (in abbreviated plain language)
SPISpecial position indicator
SPLSupplementary flight plan (message type designator)
SPOCSAR point of contact
SPOTSpot wind
SQSquall
SQLSquall line
SRSunrise
SRASurveillance radar approach
SRESurveillance radar element of precision approach radar system
SRGShort range
SRRSearch and rescue region
SRYSecondary
SSSandstorm
SSSunset
SSBSingle sideband
SSESouth-south-east
SSRSecondary surveillance radar
SSTSupersonic transport
SSWSouth-south-west
STStratus
STAStraight-in approach
STANAG*Standardization agreement (NATO)
STARStandard instrument arrival
STDStandard
STFStratiform
STNStation
STNRStationary
STOLShort take-off and landing
STSStatus
STWLStopway light(s)
SUBJSubject to
SUNSunday
SUPSupplement (AIP supplement)
SUPPSRegional supplementary procedures
SVCService (message type only)
SVCBLServiceable
SWSouth-west
SWBSouth-westbound
SWC-LL*Significant weather chart - low level
SWYStopway
SYNOP*Synopsis
T - A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
TTemperature
TTrue (preceded by a bearing to indicate reference to True North)
T*Metric tons
T-VASIST visual approach slope indicator system
TATraffic advisory
TATransition altitude
TA/HTurn at an altitude/height
TAATerminal arrival altitude
TACANUHF tactical air navigation aid
TAFAerodrome forecast
TAILTail wind
TARTerminal area surveillance radar
TASTrue airspeed
TAXTaxiing or taxi
TCTropical cyclone
TCACTropical cyclone advisory centre
TCAS RATraffic alert and collision avoidance system resolution advisory
TCHThreshold crossing height
TCUTowering cumulus
TDOTornado
TDZTouchdown zone
TECRTechnical reason
TELTelephone
TEMPOTemporary or temporarily
TFTrack to fix
TFCTraffic
TGLTouch-and-go landing
TGL*Temporary Guidance Leaflet
TGSTaxiing guidance system
THRThreshold
THRUThrough
THUThursday
TIBATraffic information broadcast by aircraft
TILUntil
TIPUntil past . . . (place)
TKOFTake-off
TLTill (followed by time by which weather change is forecast to end)
TLOFTouchdown and lift-off area
TMATerminal control area
TMZ*Transponder mandatory zone
TNIndicator for minimum temperature (used in the TAF code form)
TNATurn altitude
TNC*Terminal navigation charge
TNHTurn height
TOTo . . . (place)
TOBT*Target off block time
TOCTop of climb
TODATake-off distance available
TODAHTake-off distance available, helicopter
TOPCloud top
TORATake-off run available
TOX Toxic
TPTurning point
TRTrack
TRATemporary reserved airspace
TRANSTransmits or transmitter
TRENDTrend forecast
TRGTraining
TRLTransition level
TROPTropopause
TSThunderstorm (in aerodrome reports and forecasts, TS used alone means thunder heard but no precipitation at the aerodrome)
TSThunderstorm (followed by RA = rain, SN = snow, PL = ice pellets, GR = hail, GS = small hail and/or snow pellets or combinations thereof, e.g. TSRASN = thunderstorm with rain and snow)
TSA*Temporary segregated area
TSAT*Target start-up approval time
TSUNAMITsunami (used in aerodrome warnings)
TTTeletypewriter
TUETuesday
TURBTurbulence
TVORTerminal VOR
TWRAerodrome control tower or aerodrome control
TWYTaxiway
TX...Maximum temperature (followed by figures in TAF)
TXLTaxilane
TXTText [when the abbreviation is used to request a repetition, the question mark (IMI) precedes the abbreviation, e.g. IMI TXT] (to be used in AFS as a procedure signal)
TYPType of aircraft
TYPHTyphoon
U - A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
UUpward (tendency in RVR during previous 10 minutes)
U/SUnserviceable
UAUnmanned aircraft
UABUntil advised by . . .
UACUpper area control centre
UARUpper air route
UASUnmanned aircraft system
UAT*Universal access receiver
UAV*Unmanned aerial vehicle
UDFUltra high frequency direction-finding station
UFNUntil further notice
UHDTUnable higher due traffic
UHFUltra high frequency (300 to 3 000 MHZ)
UICUpper information centre
UIRUpper flight information region
ULMUltra light motorized aircraft
ULRUltra long range
UNAUnable
UNAPUnable to approve
UNLUnlimited
UNRELUnreliable
UPUnidentified precipitation (used in automated METAR/SPECI)
UPS*Uninterrupted power supply
USAF*United States Air Force
UTAUpper control area
UTCCoordinated Universal Time
UWT*Upper winds and temperature
V - A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
VIndicator for variations from the mean wind direction (used in the METAR/SPECI code forms)
VAHeading to an altitude
VAVolcanic ash
VAACVolcanic ash advisory centre
VACVisual approach chart (followed by name/title)
VALIn valleys
VANRunway control van
VARMagnetic variation
VARVisual-aural radio range
VASISVisual approach slope indicator system
VAT*Value-added tax
VCVicinity of the aerodrome (followed by FG = fog, FC = funnel clouds, SH = showers, PO = dust/sand whirls, BLDU = blowing dust, BLSA = blowing sand or BLSN = blowing snow, e.g. VC FG = vicinity fog)
VCYVicinity
VDFVery high frequency direction-finding station
VDL*Very high frequency data link
VERVertical
VFRVisual flight rules
VHFVery high frequency (30 to 300 MHZ)
VIHeading to an intercept
VIPVery important person
VISVisibility
VLA*Very light aircraft
VLFVery low frequency (3 to 30 KHZ)
VLOS*Visual line of sight
VLRVery long range
VMHeading to a manual termination
VMCVisual meteorological conditions
VNAVVertical navigation
VOLVolume (followed by I, II...)
VOLMETMeteorological information for aircraft in flight
VORVHF omnidirectional radio range
VORTACVOR and TACAN combination
VOTVOR airborne equipment test facility
VPAVertical path angle
VPTVisual manoeuvre with prescribed track
VRBVariable
VSABy visual reference to the ground
VSPVertical speed
VSS*Visual segment surface
VTFVector to final
VTOLVertical take-off and landing
VVVertical visibility (used in the METAR/SPECI and TAF code forms)
W - A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
WIndicator for sea-surface temperature (ued in the METAR/SPECI code forms)
WWest or western longitude
WWhite
WAASWide area augmentation system
WACWorld Aeronautical Chart - ICAO 1:1 000 000 (followed by name/title)
WAFCWorld area forecast centre
WBWestbound
WBARWing bar lights
WDIWind direction indicator
WDSPRWidespread
WEDWednesday
WEFWith effect from or effective from
WGS-84World Geodetic System - 1984
WIWithin
WIDWidth or wide
WIEWith immediate effect or effective immediately
WILCOWill comply
WINDWind
WIPWork in progress
WKNWeaken or weakening
WNWWest-north-west
WOWithout
WPR*Way-point reporting
WPTWay-point
WRNGWarning
WSWind shear
WSPDWind speed
WSWWest-south-west
WTWeight
WTC*Wake turbulence category
WTSPTWaterspout
WWWWorldwide web
WXWeather
WXRWeather radar
X - A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
XCross
XBARCrossbar (of approach lighting system)
XNGCrossing
XSAtmospherics
Y - A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
YYellow
YCZYellow caution zone (runway lighting)
YESYes (affirmative; to be used in AFS as a procedure signal)
YRYour
Z - A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
ZCoordinated Universal Time (in meteorological messages)