GEN 2.2  ABBREVIATIONS USED IN AIS PUBLICATIONS

+: Abbreviations annotated by "+" are not included in ICAO Doc 8400.
†: When radiotelephony is used, the abbreviations and terms annotated by "†", are transmitted as spoken words.
: When radiotelephony is used, the abbreviations and terms are transmitted using the individual letters in non-phonetic form.
“*” Signal is also available for use in communicating with stations of the maritime mobile service.
“# “Signal for use in the teletypewriter service only.

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 GLOSSARY OF TERMS
AAmber
AAA(Or AAB, AAC... etc. in sequence) Amended meteorological message (message type designator)
A/AAir-to-air
AADAssigned altitude deviation
AAIMAircraft autonomous integrity monitoring
AALAbove aerodrome level
AARAir to air refuelling
A2A+Amplitude modulation, Designation of emissions
A3E+Amplitude modulation, Designation of emissions
A8W+Amplitude modulation, Designation of emissions
A9W+Amplitude modulation, Designation of emissions
ABIAdvance boundary information
ABMAbeam
ABNAerodrome beacon
ABTAbout
ABVAbove
ACAltocumulus
ACARS†(to be pronounced ”AY-CARS”) Aircraft communication addressing and reporting system
ACAS†Airborne collision avoidance system
ACCArea control centre or area control
ACCC+Air Command and Control Centre
ACCIDNotification of an aircraft accident
ACFTAircraft
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
ADAerodrome
ADAAdvisory area
ADCAerodrome chart
ADDNAddition or additional
ADFAutomatic direction finding equipment
ADIZ†(to be pronounced “AY-DIZ”) Air defence identification zone
ADJAdjacent
ADOAerodrome office (specify service)
ADRAdvisory route
ADS+Automatic dependent surveillance
ADS*The 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-B‡Automatic dependent surveillance — broadcast
ADS-C‡Automatic dependent surveillance — contract
ADSUAutomatic dependent surveillance unit
ADQ+Aeronautical Data Quality
ADVSAdvisory service
ADZAdvise
AESAircraft earth station
AFILFlight plan filed in the air
AFISAerodrome flight information service
AFMYes or affirm or affirmative or that is correct
AFSAeronautical fixed service
AFTAfter ... (time or place)
AFTNAeronautical fixed telecommunication network
A/GAir-to-ground
AGAAerodromes, air routes and ground aids
AGLAbove ground level
AGNAgain
AICAeronautical information circular
AIDCAir traffic services interfacility data communications
AIMAeronautical information management
AIPAeronautical information publication
AIRACAeronautical information regulation and control
AIREP†Air-report
AIRMET†Information concerning en-route weather phenomena which may affect the safety of low-level aircraft operations
AISAeronautical information services
ALAAlighting area
ALERFA†Alert phase
ALRAlerting (message type designator)
ALRSAlerting service
ALSApproach lighting system
ALTAltitude
ALTNAlternate or alternating (light alternates in colour)
ALTNAlternate (aerodrome)
AMAArea minimum altitude
AMC+ATC microphone check
AMC+Acceptable Means of Compliance
AMDAmend or amended (used to indicate amended meteorological message; message type designator)
AMDTAmendment (AIP amendment)
AMSAeronautical mobile service
AMSLAbove mean sea level
AMSSAeronautical mobile satellite service
ANCAeronautical Chart - 1:500 000 ... (followed by name/title)
ANCSAeronautical Navigation Chart Small Scale ... (followed by name/title and scale)
ANSAnswer
AO+Aircraft Operators
AOCAerodrome obstacle chart ... (followed by type and name / title)
AOC+Air Operation Centre
AOC+Air Operator Certificate – according to EC Regulation 965/2012
AOCC+Airport Operations Control Centre
AOO+Airfield Operations Officer
AOR+Area of responsibility
APAirport
APAPI†(to be pronounced “AY-PAPI”) Abbreviated 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
APV+Approve or approved or approval
ARCArea chart
ARNGArrange
AROAir traffic services reporting office
ARPAerodrome reference point
ARPAir-report (message type designator)
ARQAutomatic error correction
ARRArrive or arrival
ARRArrival (message type designator)
ARSSpecial air-report (message type designator)
ARSTArresting (specify (part of) aircraft arresting equipment)
ASAltostratus
ASAPAs soon as possible
ASARAS+Air Search and Rescue Alert Service
ASCAscend to or ascending to
ASDAAccelerate-stop distance available
ASEAltimetry system error
ASHTAMA special series 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
ASMGCS+Advanced Surface Movement Guidance and Control System
ASPEEDL+Airspeed loss
ASPHAsphalt
ATAt ... (followed by time at which weather change is forecast to occur)
ATAActual time of arrival
ATCAir Traffic Control (in general)
ATCC+Air Traffic Control Centre
ATCSMACAir Traffic Control Surveillance Minimum Altitude Chart ... (followed by name/title)
ATDActual time of departure
ATFCM+Air traffic flow and capacity management
ATFMAir traffic flow management
ATFMP+Air traffic flow management position
ATFMU+Air traffic flow management unit
ATIS†(to be pronounced “AY-TIS”) Automatic terminal information service
ATMAir traffic management
ATNAeronautical telecommunication network
ATP+Allied Tactical Publication
ATPAt ... (time or place)
ATSAir traffic services
ATSU+Air traffic service unit
ATTNAttention
AT-VASIS†(to be pronounced “AY-TEE-VASIS”) Abbreviated T visual approach slope indicator system
ATZAerodrome traffic zone
AUGAugust
AUTHAuthorized or authorization
AUTOAutomatic
AUWAll up weight
AUXAuxiliary
AVBLAvailable or availability
AVGAverage
AVGAS†Aviation gasoline
AWOSAutomated 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 GLOSSARY OF TERMS
BBlue
BABraking action
BARO-VNAV†(to be pronounced “BAA-RO-VEENAV”) Barometric vertical navigation
BASE†Cloud base
BCFGFog patches
BCNBeacon (aeronautical ground light)
BCSTBroadcast
BDRYBoundary
BECMGBecoming
BFRBefore
BIP+Border Inspection Point
BKNBroken
BLBlowing ... (followed by DU = dust, SA = sand or SN = snow)
BLDGBuilding
BLOBelow clouds
BLWBelow...
BOMBBombing
BoMCT+Beginning of morning civil twilight
BRMist
BRFShort (used to indicate the type of approach desired or required)
BRGBearing
BRKGBraking
B-RNAV+Basic area navigation
BSCommercial broadcasting station
BSRF+Bird Strike Reporting Form
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 GLOSSARY OF TERMS
C... Centre (preceded by runway designation number to identify a parallel runway)
CDegrees Celsius (centigrade)
CACourse to an altitude
CAACivil Aviation Authority or civil aviation administration
CATCategory
CATClear air turbulence
CAVOK†(to be pronounced "KAV-OH-KAY") Visibility, cloud and present weather better than prescribed values or conditions
CB‡(to be pronounced “CEE-BEE”) Cumulonimbus
CCCirrocumulus
CC+Condition Code
CCA(or CCB, CCC... etc., in sequence) Corrected meteorological message (message type designator)
CCOContinuous climb operations
CDCandela
CDNCoordination (message type designator)
CDOContinuous descent operations
CDRConditional Route
CEATS+Central European Air Traffic Services
CET+Central European Time
CFChange frequency to...
CFCourse to a fix
CFM*Confirm or I confirm (to be used in AFS as a procedure signal)
CGLCircling guidance light(s)
CHChannel
CH#This is a channel – continuity - check of transmission to permit comparison of your record of channel-sequence numbers of messages received on the channel (to be used in AFS as a procedure signal)
CHEMChemical
CHGModification (message type designator)
CICirrus
CIDIN†Common ICAO data interchange network
CIT+Near or over large towns
CITES+Convention on International Trade in Endangered Species of Wild Fauna and Flora
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
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
CPDLC‡Controller-pilot data link communications
CPLCurrent flight plan (message type designator)
CRCCyclic redundancy check
CRMCollision risk model
CRPCompulsory reporting point
CRZCruise
CSCirrostratus
CSCall sign
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 GLOSSARY OF TERMS
DDownward (tendency in RVR during previous 10 minutes)
DDanger area ... (followed by identification)
DADecision altitude
DAM+Duty Airside Manager
DAP+Downlinked Aircraft Parameter
D - ATIS†(to be pronounced “DEE – ATIS”) Data link automatic terminal information service
D - VOLMETData link VOLMET
DCDDouble channel duplex
DCKGDocking
DCPDatum crossing point
DCPCDirect controller-pilot communications
DCSDouble channel simplex
DCTDirect (in relation to flight plan clearances and type of approach)
DE*From (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)
DEPODeposition
DERDeparture end of the runway
DESDescend to or descending to
DESTDestination
DETRESFA†Distress phase
DEVDeviation or deviating
DFDirection finding
DFDRDigital flight data recorder
DFTIDistance from touch down indicator
DGCA+Director General of Civil Aviation
DHDecision height
DHDG+Downlinked Magnetic Heading
DIAS+Downlinked Indicated Air Speed
DIFDiffuse
DISTDistance
DIVDivert or diverting
DLADelay or delayed
DLADelay (message type designator)
DLICData link initiation capability
DLYDaily
DMACH+Downlinked Mach Number
DMEDistance measuring equipment
DNGDanger or dangerous
DOFDate of flight
DOMDomestic
DPDew point temperature
DPTDepth
DRDead reckoning
DRLow drifting ... (followed by DU = dust, SA = sand or SN = snow
DRC+Downlinked Rate of Climb/Descend
DRGDuring
DSDuststorm
DSBDouble sideband
DSFL+Downlinked Selected Flight Level
DTAMDescend to and maintain
DTGDate-time group
DTHRDisplaced runway threshold
DTRTDeteriorate or deteriorating
DTWDual tandem wheels
DUDust
DUCDense upper cloud
DUPE#This is a duplicate message (to be used in AFS as a procedure signal)
DURDuration
DVD+Digital Versatile Disc
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 GLOSSARY OF TERMS
EEast or eastern longitude
EASA+European Aviation Safety Agency
EATExpected approach time
EBEastbound
ECAA+European Common Aviation Area
EDAElevation differential area
EDTOExtended diversion time operations
EEE#Error (to be used in AFS as a procedure signal)
EETEstimated elapsed time
EFCExpect further clearance
EFIS†(to be pronounced “EE-FIS”) Electronic flight instrument system
eFPLFiled flight plan exchanged via flight and flow — information for a collaborative environment (FF-ICE) services
EFTA+European Free Trade Association
EGM+Earth Gravitational Model 1996
EGNOS(to be pronounced “EGG-NOS”) European geostationary navigation overlay service
EHFExtremely high frequency (30 000 to 300 000 MHZ)
EHS+Enhanced Surveillance
ELBAEmergency location beacon — aircraft
ELEVElevation
ELRExtra long range
ELS+Elementary 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
EoECT+End of evening civil twilight
EQNEquatorial latitudes northern hemisphere
EQPTEquipment
EQSEquatorial latitudes southern hemisphere
ER*Here...or herewith
ESEEast-south-east
ESTEstimate or estimated or estimation (message type designator)
ETA*Estimated time of arrival or estimating arrival
ETDEstimated time of departure or estimating departure
ETOEstimated time over significant point
EU+European Union
EUR+Euros
EUR RODEXEuropean regional OPMET data exchange
EVEvery
EVSEnhanced vision system
EXCExcept
EXERExercises or exercising or to exercise
EXPExpect 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 GLOSSARY OF TERMS
FFixed
FACourse from a fix to an altitude
FACFacilities
FAFFinal approach fix
FALFacilitation of international air transport
FANS+Future Data Link
FAPFinal approach point
FASFinal approach segment
FATOFinal approach and take-off area
FAXFacsimile transmission
FAWP+Final approach waypoint
FBLLight (used to indicate the intensity of weather phenomena, interference or static reports, e.g. FBLRA = light rain)
FCFunnel cloud (tornado or waterspout)
FCSTForecast
FCTFriction coefficient
FDPSFlight data processing system
FEBFebruary
FEWFew
FFR+Flood, Fire, Relief
FGFog
FICFlight information centre
FIRFlight information region
FISFlight information service
FISAAutomated flight information service
FLFlight level
FLDField
FLGFlashing
FLRFlares
FLTFlight
FLTCKFlight check
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 at which weather change is forecast to begin)
FMP+Flow management position
FMCFlight management computer
FMS‡Flight management system
FMUFlow management unit
FNAFinal approach
FOD+Foreign Object Debris
FPAPFlight path alignment point
FPLFiled flight plan exchanged via aeronautical fixed service (AFS)
FPMFeet per minute
FPRFlight plan route
FRFuel remaining
FRA+Free Route Airspace
FREQFrequency
FRIFriday
FRNGFiring
FRONT†Front (relating to weather)
FROST†Frost (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
FUA+Flexible use of airspace
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 GLOSSARY OF TERMS
GGreen
GVariations from the mean wind speed (gusts) ... (followed by figures in METAR/SPECI and TAF)
GAGeneral aviation
GAGo ahead, resume sending (to be used in AFS as a procedure signal)
G/AGround-to-air
G/A/GGround-to-air and air-to-ground
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
GBAS(to be pronounced “GEE-BAS”) Ground-based augmentation system
GCAGround controlled approach system or ground controlled approach
GDCA+General Directorate of Civil Aviation
GENGeneral
GEOGeographic or true
GESGround earth station
GLDGlider
GLONASS†(to be pronounced “GLO-NAS”) Global orbiting navigation satellite system
GLSGBAS landing system
GMCGround movement chart ... (followed by name/title)
GNDGround
GNDCKGround check
GNSS‡Global navigation satellite system
GOVGovernment
GPGlide path
GPAGlide path angle
GPIPGlide path intercept point
GPS‡Global positioning system
GPUGround power unit
GPWS‡Ground proximity warning system
GRHail
GRAS(to be pronounced “GRASS”) Ground-based regional augmentation system
GRASSGrass landing area
GRF+Global Reporting Format
GRIBProcessed meteorological data in the form of grid point values expressed in binary form (meteorological code)
GRN+Green
GRVLGravel
GSGround speed
GSSmall hail and/or snow pellets
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 GLOSSARY OF TERMS
HHigh pressure area or the centre of high pressure
HSignificant wave height ... (followed by figures in METAR/SPECI)
H24Continuous day and night service
HAHolding/racetrack to an altitude
HAPIHelicopter approach path indicator
HBNHazard beacon
HCHHeliport crossing height
HDFHigh frequency direction-finding station
HDFC+Hungarian Defence Forces Command
HDGHeading
HELHelicopter
HFHolding/racetrack to a fix
HFHigh frequency (3 000 to 30 000 KHZ)
HGTHeight or height above
HIAL+High intensity approach lights
HIRL+High intensity runway lights
HJSunrise to sunset
HLDGHolding
HLPHeliport
HLSHelicopter landing site
HMHolding/racetrack to a manual termination
HNSunset to sunrise
HNG+Hungarian or Hungary
HNHHigh latitudes northern hemisphere
HOService available to meet operational requirements
HOLHoliday
HOSPHospital aircraft
HPAHectopascal
HRHours
HRPHeliport reference point
HSService available during hours of scheduled operations
HSHHigh latitudes southern hemisphere
HU+Hungarian
HUDHead-up display
HUF+Hungarian Forints
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. HVYRA = heavy rain)
HWS+Horizontal wind shear
HXNo specific working hours
HYRHigher
HZHaze
HZHertz (cycle 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 GLOSSARY OF TERMS
IACInstrument approach chart ... (followed by name/title)
IAFInitial approach fix
IAIP+Integrated Aeronautical Information Package
IAOIn and out of clouds
IAPInstrument approach procedure
IARIntersection of air routes
IASIndicated airspeed
IATA+International Air Transport Association
IBNIdentification beacon
IC+Ice crystals (very small ice crystals in suspension, also known as diamond dust)
ICAOInternational Civil Aviation Organization
ICEIcing
IDIdentifier or identify
IDENT†Identification
IFIntermediate approach fix
IFFIdentification friend/foe
IFPS+Integrated initial flight plan processing system
IFRInstrument flight rules
IGAInternational general aviation
ILSInstrument landing system
IMInner marker
IMCInstrument meteorological conditions
IMGImmigration
IMI*Interrogation sign (question mark) (to be used in AFS as a procedure signal)
IMPRImprove or improving
IMTImmediate or immediately
INAInitial approach
INBDInbound
INCIn cloud
INCERFA†Uncertainty phase
INCORPIncorporated
INFO†Information
INOPInoperative
INPIf not possible
INPRIn progress
INSInertial navigation system
INS+Inches
INSTLInstall or installed or installation
INSTRInstrument
INTIntersection
INTLInternational
INTRGInterrogator
INTRPInterrupt or interruption or interrupted
INTSFIntensify or intensifying
INTSTIntensity
IRIce on runway
IRSInertial reference system
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 GLOSSARY OF TERMS
JAA+Joint Aviation Authorities
JANJanuary
JFC+Joint Forces Command
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 GLOSSARY OF TERMS
KGKilograms
KHZKilohertz
KIASKnots indicated airspeed
KMKilometres
KMHKilometres per hour
KPAKilopascal
KTKnots
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 GLOSSARY OF TERMS
L... Left (preceded by runway designation number to identify a parallel runway)
LLitre
LLocator
LLow pressure area or the centre of low pressure
LAMLogical acknowledgement (message type designator)
LANInland
LATLatitude
LCALocal or locally or location or located
LDALanding distance available
LDAHLanding distance available, helicopter
LDGLanding
LDILanding direction indicator
LENLength
LFLow frequency (30 to 300 KHZ)
LGTLight or lighting
LGTDLighted
LI+Locator inner
LIHLight intensity high
LILLight intensity low
LIMLight intensity medium
LINELine (used in SIGMET)
LLZ+Localizer
LMLocator, middle
LMTLocal mean time
LNAV†(to be pronounced “EL-NAV”) Lateral navigation
LNGLong (used to indicate the type of approach desired or required)
LOLocator, outer
LOCLocalizer
LONGLongitude
LORANLong range air navigation system
LOSSAirspeed or headwind loss
LPVLocalizer performance with vertical guidance
LRLast message received by me was ….(to be used in AFS as a procedure signal)
LRGLong range
LSLast message sent by me was … or Last message was... (to be used in AFS as a procedure signal)
LT+Local Time
LTALower control area
LTDLimited
LTF+Land line telephone
LTPLanding threshold point
LTT+Landline teletypewriter
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 GLOSSARY OF TERMS
M... Metres (preceded by figures)
MMach number ... (followed by figures)
MMinimum value of runway visual range ... (followed by figures in METAR/SPECI)
MAAMaximum authorized altitude
MAGMagnetic
MAHFMissed approach holding fix
MAINTMaintenance
MAPAeronautical maps and charts
MAPTMissed approach point
MARMarch
MARAt sea
MAS+Manual A1 simplex
MATFMissed approach turning fix
MATZMilitary aerodrome traffic zone
MAXMaximum
MAYMay
MBSTMicroburst
MCAMinimum crossing altitude
MCTRMilitary control zone
MCWModulated continuous wave
MDAMinimum descent altitude
MDD+Main Duty Department
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)
MET†Meteorological or meteorology
METAR†Aerodrome routine meteorological report (in meteorological code)
MET REPORTLocal routine meteorological report (in abbreviated plain language)
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
MI+Ministry of the Interior
MIDMid-point (related to RVR)
MIFGShallow fog
MILMilitary
MIN*Minutes
MISMissing … (transmission identification) (to be used in AFS as a procedure signal)
MKRMarker radio beacon
MLSMicrowave landing system
MMMiddle marker
MNHMiddle latitudes northern hemisphere
MMO+Main Meteorological Office
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. MODRA = moderate rain)
MONAbove mountains
MONMonday
MOPS†Minimum operational performance standards
MOVMove or moving or movement
MPSMetres per second
MRAMinimum reception altitude
MRGMedium range
MRPATS MET reporting point
MSMinus
MSAMinimum sector altitude
MSAS(to be pronounced “EM-SAS”) Multifunctional transport satellite (MTSAT) satellite-based augmentation system
MSAWMinimum safe altitude warning
MSGMessage
MSHMiddle latitudes southern hemisphere
MSLMean sea level
MSR#Message … (transmission identification) has been misrouted (to be used in AFS as a procedure signal)
MSSRMonopulse secondary surveillance radar
MTMountain
MTOMMaximum take-off mass
MTMA+Military TMA
MTOW+Maximum take-off weight
MTSAT+Multifunctional transport satellite
MTUMetric units
MTWMountain waves
MVA+Minimum vectoring altitude
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 GLOSSARY OF TERMS
NNo distinct tendency (in RVR during previous 10 minutes)
NNorth or Northern latitude
NADPNoise Abatement Departure Procedure
NAS+National Ambulance Service
NASARS+National Air Search and Rescue System
NASC†National 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
NDGDM+National Directorate General for Disaster Management
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
NIL*†None or I have nothing to send to you
NLA+National Light Aviation
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
NON+Designation of non-modulated
NPH+National Police Headquarters
NONSTDNon-standard
NOSIG†No significant change (used in trend-type landing forecasts)
NONFUA+Not subject to Flexible use of airspace
NOTAM†A 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
NOZ‡Normal operating zone
NPANon-precision approach
NPZ+Non-standard Planning Zone
NRNumber
NRHNo reply heard
NSNimbostratus
NS+Non-Scheduled
NSCNil significant cloud
NSENavigation system error
NSWNil significant weather
NTLNational
NTZ‡No 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 GLOSSARY OF TERMS
OACOceanic area control centre
OASObstacle assessment surface
OAT+Operational Air Traffic
OBSObserve or observed or observation
OBSCObscure or obscured or obscuring
OBSTObstacle
OCAObstacle clearance altitude
OCAOceanic control area
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
OK*We agree or It is correct (to be used in AFS as a procedure signal)
OL+Operating License - according to EC Regulation 1008/2008
OLDI†On-line data interchange
OMOuter marker
OPAOpaque, white type of ice formation
OPCControl indicated is operational control
OPMET†Operational meteorological (information)
OPNOpen or opening or opened
OPROperator or operate or operative or operating or operational
OPS†Operations
O/ROn request
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 GLOSSARY OF TERMS
PMaximum value of wind speed or runway visual range ... (followed by figures in METAR/SPECI and TAF)
P+Private
PProhibited area ... (followed by identification)
PAPrecision approach
PALSPrecision approach lighting system (specify category)
PANSProcedures for air navigation services
PAPI†Precision 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
PDC‡Pre-departure clearance
PDC+Parking and Docking Chart
PDF+Portable Document Format
PDGProcedure design gradient
PERPerformance
PERMPermanent
PFPPreliminary flight plan
PIBPre-flight information bulletin
PJEParachute jumping exercise
PLIce pellets
PLAPractice low approach
PLVLPresent level
PNPrior notice required
PNRPoint of no return
PODust/sand whirls (dust devils)
P2+Prognostic chart for 200 HPA
P3+Prognostic chart for 300 HPA
P5+Prognostic chart for 500 HPA
P7+Prognostic chart for 700 HPA
P85+Prognostic chart for 850 HPA
Psw+Prognostic chart of significant weather
PTrVM+Prognostic tropopause and maximum wind chart
POBPersons on board
PON+Pulse modulation, designation of emissions
POSSPossible
PPIPlan position indicator
PPRPrior permission required
PPSNPresent position
PRFGAerodrome partially covered by fog
PRIPrimary
PRKGParking
PRM+Persons with reduced mobility
PROB†Probability
PROCProcedure
PROPPropeller
PROVProvisional
PRPPoint-in-space reference point
PSPlus
PSGPassing
PSNPosition
PSPPierced steel plank
PSR‡Primary 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 GLOSSARY OF TERMS
QDLDo you intend to to ask me for a series of bearings? or I intend to ask for a series of bearings (to be used in radiotelegraphy as a Q Code)
QDMMagnetic heading (zero wind)
QDRMagnetic bearing
QFEAtmospheric pressure at aerodrome elevation (or at runway threshold)
QFUMagnetic orientation of runway
QGEWhat is my distance to your station or Your distance to my station is (distance figures and units) (to be used in radiotelegraphy as a Q Code)
QJHShall I run my test tape/a test sentence? or Run your test tape/a test sentence (to be used in AFS as a Q Code)
QNHAltimeter sub-scale setting to obtain elevation when on the ground
QSPWill you relay to … free of charge? or I will relay to … free of charge (to be used in AFS as a Q Code)
QTAShall I cancel telegram number … ? or Cancel telegram number … (to be used in AFS as a Q Code)
QTETrue bearing
QTFWill you give me the position of my station according to the bearings taken by the D/F stations which you control? or The position of your station according to the bearings taken by the D/F stations that I control was … latitude …longitude (or other indication of position), class … at … hours (to be used in radiotelegraphy as a Q Code)
QUADQuadrant
QUJWill you indicate the TRUE track to reach you? or The TRUE track to reach me is … degrees at … hours (to be used in radiotelegraphy as a Q Code)
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 GLOSSARY OF TERMS
R... Right (preceded by runway designator number to identify a parallel runway)
RRate of turn
RRed
RRadial from VOR ... (followed by three figures)
RRestricted area ... (followed by identification)
RRunway ... (followed by figures in the METAR/SPECI)
R*Received (acknowledgement of receipt) (to be used in AFS as a procedure signal)
RARain
RAResolution advisory
RACRules of the air and air traffic services
RAD+Route Availability Document
RAGRagged
RAGRunway arresting gear
RAIRunway alignment indicator
RAIM†Receiver autonomous integrity monitoring
RASC†Regional AIS system centre
RASSRemote altimeter setting source
RBRescue boat
RCAReach cruising altitude
RCCRescue coordination centre
RCFRadiocommunication failure (message type designator)
RCHReach or reaching
RCLRunway centre line
RCLLRunway centre line light(s)
RCLRRecleared
RCP‡Required communication performance
RCR+Runway Condition Report
RDHReference datum height
RDLRadial
RDORadio
RDOACTRadioactive
RERecent (used to qualify weather phenomena e.g. RERA = recent rain)
REA+Ready message
RECReceive or receiver
REDLRunway edge light(s)
REFReference to... or refer to...
REGRegistration
RENLRunway end light(s)
REPReport or reporting or reporting point
REQ Request or requested
RERTERe-route
RESARunway end safety area
RFConstant radius arc to a fix
RFC+Radio facility chart
RFFSRescue and fire fighting services
RFP+Replacement Flight Plan
RGRange (lights)
RHCRight-hand circuit
RIFReclearance in flight
RIME†Rime (used in aerodrome warnings)
RITE+Right (direction of turn)
RLReport leaving
RLARelay to
RLCERequest level change en route
RLLSRunway lead-in lighting system
RLNARequest level not available
RMAC+Radar minimum altitude chart
RMKRemark
RMZ+Radio Mandatory Zone
RNAV†(to be pronounced "AR-NAV") Area navigation
RNGRadio range
RNP‡Required navigation performance
ROBEX†Regional OPMET bulletin exchange (scheme)
ROCRate of climb
RODRate of descent
RONReceiving only
RPDSReference path data selector
RPI‡Radar position indicator
RPLRepetitive flight plan
RPLCReplace or replaced
RPSRadar position symbol
RPT*Repeat or I repeat (to be used in AFS as a procedure signal)
RQ*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
RSPResponder beacon
RSP‡Required surveillance performance
RSREn-route surveillance radar
RSSRoot sum square
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
RVSMReduced vertical separation minimum (300 m (1 000 ft) between FL 290 and FL 410)
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 GLOSSARY OF TERMS
S+Scheduled
SSouth or Southern latitude
SState of the sea ... (followed by figures in METAR/SPECI)
S6+6-hourly surface synoptic chart
SASand
SALSSimple approach lighting system
SANSanitary
SARSearch and rescue
SARPSStandards and Recommended Practices (ICAO)
SATSaturday
SATCOM†Satellite communication (used only when referring generally to both voice and data satellite communication or only data satellite communication)
SATVOICE†Satellite voice communication
SBSouthbound
SBAS(to be pronounced “ESS-BAS”) Satellite-based augmentation system
SCStratocumulus
SCR+Schedule Clearance Request
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
SECSI FRA+South East Common Sky Initiative Free Route Airspace
SEE FRA+South-East Europe Free Route Airspace
SELCAL†Selective calling system
SEPSeptember
SERService or servicing or served
SERA+Standardised European Rules of the Air
SEVSevere (used to qualify icing and turbulence reports)
SFCSurface
SFT+Surface Friction Tester
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
SIGMET†Information concerning en-route weather and other phenomena in the atmosphere that may affect the safety of aircraft operations
SIMULSimultaneous or simultaneously
SIWLSingle isolated wheel load
SKEDSchedule or scheduled
SLAP+Slot allocation procedure
SLPSpeed limiting point
SLT+Slot allocation message
SLWSlow
SMA+Schedule Movement Advice
SMCSurface movement control
SMRSurface movement radar
SNSnow
SNOCLOAerodrome closed due to snow (used in METAR/SPECI)
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
SPECI†Aerodrome special meteorological report (in meteorological code)
SPECIAL†Local special meteorological report (in abbreviated plain language)
SPISpecial position indicator
SPLSupplementary flight plan (message type designator)
SPOCSAR point of contact
SPOT†Spot wind
SQSquall
SQLSquall line
SRSunrise
SRASurveillance radar approach
SRESurveillance radar element of precision approach radar system
SRGShort range
SRRSearch and rescue region
SRQ+Slot request message
SRYSecondary
SSSandstorm
SSSunset
SSBSingle sideband
SSESouth-south-east
SSIM+Standard Schedules Information Manual
SSRSecondary surveillance radar
SSTSupersonic transport
SSWSouth-south-west
STStratus
STAStraight-in approach
STANAG+Standardization Agreement
STAR†Standard 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
SWH+High Level Significant Weather Chart (FL 250 - FL 450)
SWL+Low Level Significant Weather Chart (Surface - FL 100)
SWM+Medium Level Significant Weather Chart (FL 100 - FL 250)
SWXSpace weather
SWXCSpace weather centre
SWYStopway
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 GLOSSARY OF TERMS
TTemperature
T... True (preceded by a bearing to indicate reference to True North)
TATraffic advisory
TATransition altitude
TAATerminal arrival altitude
TACANUHF tactical air navigation aid
TAF†Aerodrome forecast (in meteorological code)
TA/HTurn at an altitude/height
TAIL†Tail wind
TARTerminal area surveillance radar
TASTrue airspeed
TAXTaxiing or taxi
TCTropical cyclone
TCA+Area of responsibility of TMA sector
TCACTropical cyclone advisory centre
TCAS+Traffic Collision Avoidance System
TCAS RA†(to be pronounced “TEE-CAS-AR-AY”) Traffic alert and collision avoidance system resolution advisory
TCHThreshold crossing height
TCO+Third Country Operators
TCP+Transfer of control point
TCUTowering cumulus
TDA+Area or responsibility of BUDAPEST DIRECTOR
TDOTornado
TDZTouchdown zone
TECRTechnical reason
TELTelephone
TEMPO†Temporary or temporarily
TFTrack to fix
TFCTraffic
TGLTouch-and-go landing
TGL+Temporary Guidance Leaflet
TGSTaxiing guidance system
THRThreshold
THRUThrough
THUThursday
TIBA†Traffic information broadcast by aircraft
TIL†Until
TIPUntil past ... (followed by place)
TIZ+Traffic Information Zone
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
TNMinimum temperature ... (followed by figures in TAF)
TNATurn altitude
TNHTurn height
TOTo ... (followed by place)
TOBT+Target Off Block Time
TOCTop of climb
TODATake-off distance available
TODAHTake-off distance available, helicopter
TOP†Cloud top
TORATake-off run available
TOXToxic
TPTurning point
TRTrack
TRATemporary Reserved Airspace
TRANSTransmits or transmitter
TREND†Trend forecast
TRCC+Terminal Radar Control Centre
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
TSB+Transportation Safety Bureau
TSUNAMI†Tsunami (used in aerodrome warnings)
TTTeletypewriter
TUETuesday
TURBTurbulence
T-VASIS†(to be pronounced “TEE –VASIS”) T visual approach slope indicator system
TVORTerminal VOR
TWRAerodrome control tower or aerodrome control
TWYTaxiway
TWYL+Taxiway-link
TXMaximum temperature ... (followed by figures in TAF)
TXLTaxilane
TXT*Text (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 GLOSSARY OF TERMS
UUpward (tendency in RVR during previous 10 minutes)
U/SUnserviceable
U2+200 HPA chart
U25+250 HPA chart
U3+300 HPA chart
U4+400 HPA chart
U5+500 HPA chart
U7+700 HPA chart
U85+850 HPA chart
UAUnmanned aircraft
UABUntil advised by...
UACUpper area control centre
UARUpper air route
UASUnmanned aircraft system
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)
USD+US dollars
UTAUpper control area
UTCCoordinated Universal Time
UTM+Universal Transverse Mercator
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 GLOSSARY OF TERMS
V... Variations from the mean wind direction ... (preceded and followed by figures in METAR/SPECI, e.g. 350V070)
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 systems
VAT+Value-added tax
VCVicinity of the aerodrome ... (followed by FG = fog, FC = funnel cloud, SH = shower, PO = dust/sand whirls, BLDU = blowing dust, BLSA = blowing sand, BLSN = blowing snow, DS = duststorm, SS = sandstorm, TS = thunderstorm or VA = volcanic ash e.g. VC FG = vicinity fog)
VCYVicinity
VDFVery high frequency direction-finding station
VDL+VHF Data Link
VERVertical
VFRVisual flight rules
VHFVery high frequency (30 to 300 MHZ)
VHO+Veterinary Hygiene Office
VIHeading to an intercept
VIPVery important person
VISVisibility
VLFVery low frequency (3 to 30 KHZ)
VLRVery long range
VMHeading to a manual termination
VMCVisual meteorological conditions
VNAV†(to be pronounced “VEE-NAV”) Vertical navigation
VOLVolume ... (followed by I, II ...)
VOLMET†Meteorological 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 ... (followed by figures in METAR/SPECI and TAF)
VWS+Vertical wind shear
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 GLOSSARY OF TERMS
WWest or western longitude
WWhite
WSea-surface temperature (followed by figures in METAR/SPECI)
WAASWide area augmentation system
WACWorld Aeronautical Chart – ICAO 1 : 1 000 000 ... (followed by name/title)
WAFCWorld area forecast centre
WBWestbound
WBARWing bar lights
WD+Working day
WDIWind direction indicator
WDSPRWidespread
WE+Weekend
WEDWednesday
WEFWith effect from or effective from
WGS-84World Geodetic System - 1984
WHI+White
WIWithin
WIDWidth or wide
WIEWith immediate effect or effective immediately
WILCO†Will comply
WINDWind
WIPWork in progress
WKNWeaken or weakening
WMO+World Meteorological Organization
WNWWest-north-west
WOWithout
WPTWay-point
WRNGWarning
WSWind shear
WSG+Worldwide Slot Guidelines
WSPDWind speed
WSWWest-south-west
WTWeight
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 GLOSSARY OF TERMS
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 GLOSSARY OF TERMS
YYellow
YCZYellow caution zone (runway lighting)
YEL+Yellow
YES*Yes (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 GLOSSARY OF TERMS
ZCoordinated Universal Time (in meteorological messages)