Download - Lexicon of Acronyms
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A
A/A Air to AirAFIS Aerodrome Flight Information
service
AACC Area Approach AFIL Flight notification:
Control Centre - filed in the air, or
Deviation - indicating the
AAIS Automatic Aerodrome position at which ATSInformation Service services will first be
AAL Above Aerodrome required.
Level AFM Yes, Affirm,
ABI Advance Boundary Affirmative, that is
Information correct
ABM Abeam AFS Aeronautical Fixed Service
ABN Aerodrome Beacon AFT After
ABT About AFTN Aeronautical Fixed
ABV Above ... Telecommunication
AC Altocumulus Network
ACARS Aircraft AFU Aviation Forecast Unit
Communication A/G Air-to-GroundAddressing and AGA Aerodromes, Air
Reporting System Routes and Ground
(pronounced Aids
"AY-CARS') AGL Above Ground Level
ACAS Airborne Collision AH After Hours
Avoidance System AIC Aeronautical
ACC Area Control Centre Information Circular
ACD Airways Clearance AIP Aeronautical
Delivery Information
ACFT Aircraft Publication
ACK Acknowledge AIRAC Aeronautical
ACN Aircraft Classification Information
Number Regulation and control
ACP Acceptance Messages AIREP Air-ReportACPT Accept, Accepted, AIRMET Information in plainACT Active, Activated, language concerning
Activity weather significant to
AD Aerodrome light aircraft
ADC Aerodrome Chart Operations
ADF Automatic Direction at or below 10,000 FT
Finding Equipment AIS Aeronautical
ADIZ Air Defence Information Service
Identification Zone AL Approach LightsADJ Adjacent ALERFA Alert phase
ADR Advisory Route ALR Alerting Message
ADS Automatic Dependent ALS Approach Lighting
Surveillance System
AEP Aerodrome Emergency ALT Altitude
Plan ALTN Alternate (aerodrome)
AERIS Automatic En Route ALTN Alternate, Alternating
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Information Service (light alternates in colour)
AM Ampiltude Moduation ASDA Accelerate-Stop
AMD Amend, Amended Distance Available
AMDT Amendment (AIP Amendment) ASDE Airfield Surface Detection
AMIS Aeronautical Information servcice Equipment
AMSL Above Mean Sea Level ASE Altimetry System ErrorANC Aeronautical Chart ASI Air Speed IndicatorOA Angle of attack ASL Above Sea Level
1:500,00 followed by name/title) ASPH Asphalt
AOC Air Operators ASR Area Surveillance
Certificate Radar
AOC Aerodrome ATA Actual Time of Arrival
Obstacle Chart ATAS Air Traffic Advisory service(name/title) ATC Air Traffic Control (in
AOI Airways Operational instructions general)AP Airport ATD Actual Time of DepartureAPAPI Abbreviated Precision ATFM Air Traffic Flow Management
Approach Path ATIS Automatic TerminalAPC Approach Control Information ServiceAPCH Approach ATN AeronauticalAPDC Aircraft Telecommunications
Parking/Docking Chart Network(followed by Name/title) ATS Air Traffic Services
APN Apron ATTN AttentionAPP Approach Control AT-VASIS Abbreviated "T" VisualAPR April Approach SlopeAPRX Approximate, Indicator SystemAPSG After Passing (pronouncedAQZ Area QNH Zone AY-TEE-VASIS)
ARFL Aeroplane Reference, ATZ Aerodrome Traffic ZoneField Length AUG August
ARNG Arrange AUTH Authorised,ARP Aerodrome AUW All Up Weight
Reference Point AUX AuxiliaryARP Air-Report (message AVBL Available
type designator) AVG Average
ARR Arrive, rrival AVGAS Aviation Gasoline
ARS Special Air-Report AWIB Aerodrome Weather(message type designator) Information Broadcast
ARR Arrive, arrival AWK Aerial Work
AS Altostratus AWS Automatic Weather Station
ASAP As Soon as Possible AWY Airway
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B
B Blue BLDG Building
BASARNAS Badan SAR Nasional BLO Below Clouds
BASE Cloud Base BO Beacon Outbound
BCFG Fog Patches BLW Below
BCN Beacon (aeronautical BOMB Bombing
ground light) BR MistBCST Broadcast BRF Short (used to indicate
BDRY Boundary type of approach)
BECMG Becoming BRG Bearing
BFR Before BRKG Braking
BKN Broken (cloud Descriptor) BS Broadcasting Station(Commercial)
BL Blowing (followed by BT Base turn
DU=dust, SA=sand or BTL Between Layers
SN=snow) BTN Between
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C
C Degrees Celsius CNL- Cancel
(Centigrade) CNL Flight plan
C Centre (Runway) cancellation message
CAS Calibrated Air Speed CNS Communications,
CAT Category Navigation
CAT Clear Air Turbulence SurveillanceCAVOK Visibility, cloud and COM Communications
present weather better than CONC Concrete
prescribed values or Conditions COND ConditionCB Cumulonimbus CONS Continuous
CC Cirrocumulus CONST Construction,
CCTS Circuits Constructed
CDN Co-ordination Message CONT Continue(s),
CEN En Route and Area Continued
ATC Unit COOR Coordinate,
CET Clearance Expiry Time Coordinated
CF Change Frequency to COORD Coordinates
CFL Cleared Flight Level COR Correct, Corrected,CFM Confirm, 1 confirm COP Change Over Point
CH Channel COS Conical Surface
CHG Modification Messages COT At the Coast, Coastal
CK Check COV Cover, Covered,
CL Centre Line Covering
CLA Clear type of ice CPDLC Controller-Pilot
formation Data Link Communication
CHTR Charter CPL Current Flight Plan Messages
Ci Cirrus CRC Cyclic Redundancy Check
CLBR Calibration CRZ Cruise
CLD Cloud CS Call-sign
CLG Calling Cs CirrostratusCLIAS Climbing Indicated CTA Control Area
Airspeed CTC Contact
CLR Clear, Cleared to CTL Control
Clearance CTN Caution
CLSD Closed, Close, CTR Control Zone
Closing CTZ Control Zone
Cm Centimeter Cu Cumulus
CMB Climb to or Climbing to CUF Cumuliform
CMPL Completion, CUST Customs
Completed, or Complete CVR Cockpit Voice Recorder
CMSD Commissioned CWY Clearway
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D
D Danger Area DISP Displaced(followed by identification) DIST Distance
D Deleted DIV Diversion, Divert,DA Decision Altitude DivertingDALR Dry Adiabatic Laspe rate DLA Delay, Delayed
DAP Departure and DLIC Data Link InitiationApproach Procedures Capability
D-ATIS Data Link Automatic DLY Daily
Terminal Information DME Distance Measuring EquipmenT
Service (pronounced DMEN DME (international)
"DEE-ATIS") DMEP DME (International Precision
DCMSD Decommissioned - used in Conjunction with MLS)
DCPC Direct Controller-Pilot DNG Danger, Dangerous
Communications DOC Documents
DCKG Docking DOM Domestic
DCT Direct (in relation to DP Dew Point Temperature
flight plan clearances DPT Depth
and type of approach) DR Dead ReckoningDEC December DR Low drifting (followed
DEG Degrees by DU=dust, SA=sand
DEP Depart, Departure, or SN=snow)
Departed, Departing , DRG During
Departure Message DS Duststorm
DER Departure End of DTAM Descend to And MaintainRunway Departure DTG Date-Time GroupEnd of the Runway DTHR Displaced Runway Threshold
DES Descending to DTRT Deteriorate, Deteriorating
DEST Destination DU DustDETRESF
A Distress Phase DUR DurationDEV Deviation, Deviating DUC Dense Upper Cloud
DF Direction Finder/Finding D-VOLMET Data Link VOLMET
DFDR Digital Flight Data Recorder DVOR Doppler VOR
DH Decision Height DZ Drizzle
DIF Diffuse
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E
E East, East Longitude EOBT Estimated off Blocks Time
EAS Equalivent Air Speed EP Electronic Position
EAT Expected Approach Time EPIRB Indicating Radio Beacon (marine
EDD Electronic Data Display Term.)
EET Estimated Elapsed EQPT Equipment
Time ERC En Route ChartEHF Extremely High Frequency ESE East South-East
(30 000 to300 000 MHZ) EST Estimate or estimated
ELEV Elevation or estimate (message
ELR Extra Long Range type designator)
ELR Enviromental Lapse Rate ETA Estimated Time of
ELT Emergency Locator Arrival, Estimating Arrival
Transmitter ETB Esimated time at the Boundary
EM Emission ETD Estimated Time of Departure
EM Electromagnetic Radiation Estimating Departure
EMBD Embedded in a Layer ETO Estimated Time Over
(to indicate Cumulonimbus significant point
embedded in layers of other EV Every
clouds) EXC Except
EMERG Emergency EXER Exercises,
EMG Emergency Exercising, to exercise
ENDCE Endurance EXP Expect, Expected, Expecting
ENE East North-East EXTD Extend, Extending, Extended
ENG Engine
ENR En Route
ENRC En Route Chart
(followed by name/title)
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F
F Fixed (chart symbol) FLT Flight
FA Final Approach Flight Check
FAC Facility, Facilities FLTCK Fluctuating,
FAF Final Approach Fix FLUC Fluctuation,
FAL Facilitation of International Airport Fluctuated
FANS Future Air Navigation System FLW Follow(s), FollowingFAP Final Approach Point FLY Fly, FlyingFATO Final Approach and FM From (followed by time weather
Take- Off Area change is forecast to begin)
FAWP Final Approach FM Frequency Modulation
Way-point FMS Flight Management
FAX Facsimile System
Transmission FMU Flow Management Unit
FBL Light (used to indicate the intensity FOD Foreign Object Damage
of WX phenomena, interference FPD Flight Plan Designator
or static reports, eg FBI- RA FPL Filed Flight Plan
light rain) Message
FC Funnel Cloud FPM Feet per Minute(tornado or water spout) FPR Flight Plan Route
FCST Forecast FPS Feet per Second
FDL Fixed Distance Lighting FR Fuel Remaining
FDPS Flight Data Processing system FRI Friday
FEB February FREQ Frequency
FEW Few (cloud FRNG Firingdescriptor) FRQ Frequent
FFR Flood, Fire Relief FS Flight Service (in general)
FG Fog FSL- Full Stop Landing
FIC Flight Information Centre FST First
FIO Flight Information Office FT Feet
FIR Flight Information Region FU SmokeFIS Flight Information Service FXD Fixed
FISS Flight Information Service Station FZ Freezing
FL Flight Level FZW Freezing Drizzle
FLD Field FZFG Freezing Fog
FLG Flashing FZL Freezing Level
FLR Flares FZRA Freezing Rain
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G
G Green GNSSGlobal Navigation SatelliteSystem
GCA Ground Controlled GP Glide Path
Approach GP FLG Group Flashing (number)
GEN General (used in conjunction with
GEO Geographic, true aerodrome lighting)GES Ground Earth Station GPS Global Positioning System
GFY Glider Flying GPI Glide Path Intercept
GHz Gigahertz GR Hail
GLD Glider GRAD Minimum Required climb gradient
GLONASS Global Orbiting Navigation GRADU A Gradual Change
Satellite System GRASS Grass Landing Area
(pronounced GLO-NAS) GRVL Gravel
GMC Ground Movement GS Groundspeed
Chart (followed by name/title) GS Small Hail andlor
GND Ground Snow Pellets
GNDCK Ground Check GUND Geoid Undulation
GNS Global Navigation System
H
H24 Continuous day and HO Service available to meet
night service operational Requirements
HAT Height Above HOSP Hospital AircraftAerodrome HPA Hectopascal
Height Above HR Hours
Threshold HS Service available during hours
HBN Hazard Beacon of scheduled operationsHDG Heading HIS Hortizonal Situation Indicator
HEL Helicopter HSL Hold Short Lights
HF High Frequency HURCN Hurricane
(3000 to 30,000 KHZ) HVY Heavy
HGT Height, Height Above HVY Heavy (used to indicate the
HIALHigh Intensity ApproachLighting, intensity of WX phenomena,
HIOL High Intensity Obstacle Lights, eg HVY RA = heavy rain)
HIRL High Intensity Runway Lighting HX No specific working Hours
HJ Sunrise to Sunset HYR Higher
HLDG Holding HZ Haze
HLS Helicopter Landing HZ Hertz
Site HZS Horizontal Surface
HN Sunset to Sunrise
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I
IAL Instrument Approach INCERFA Uncertainty Phase
and Landing Chart INFO Information
IAS Indicated Air Speed INOP Inoperative
lAWP Initial Approach Way-point INS Inertial Navigation
IBN Identification Beacon System
ICAO International Civil INSTIL Install, Installed,Aviation Organisation Installation
IC Ice Crystals (MET code) INSTR Instrument
ICE Icing, Ice INT Intersection
ID Identifier, identify INTER Intermittent,
IDENT Identification Conditions IntermittentlyIF Intermediate Approach Fix International
IFF Identification Friend/Foe INTL Interrogator
IFR Instrument Flight Rules INTRG Interrupt, Interruption,
ILS Instrument Landing System INTSF Intensify, Intensifying
IM Inner Marker INTST Intensity
IMC Instrument Meteorological ISA InternationalConditions Standard
IMG Immigration Atmosphere
IMPR Improve, Improving, ISB Independent
Improvement Sideband
IMT Immediate, ISOL Isolated
Immediately ITCZ Inter Tropical Convergence Zone
INBD Inbound IWI Illuminated Wind Indicator
INC In Cloud IWP Intermediate Way-point
J
JAN January JTST Jet Stream
J-BAR Jet Barrier JUL July
JF Saturday, Sunday and PH JUN June
JO Monday to Friday except PH
K
KG Kilograms KPA Kilopascals
KHZ Kilohertz KT Knots
KM Kilometers KW Kilowatts
KMH Kilometers per Hour
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L
L Left (runway identification) sLLNLow Level Navigation(by theMIL)
L Locator (see LM, LO) LLOLow Level Operations(by theMIL)
LAM
Local Acknowledgement
Message LL Lower LimitsLAT Latitude LLZ Localizer
LDA Landing Distance LM Locator (middle)
Available LMT Local mean time
LDG Landing LPL Local Flight Plan
LDI Landing Direction LO Locator (outer)
Indicator LOC Locally, Location,
LEN Length Located, Local
LF Low Frequency (30 to300 KHZ) LOE Lane of Entry
LONG Longitude
LGT Light, Lighting LRG Long Range
LGTD Lighted LSALT Lowest Safe Altitude
LIH Light Intensity High LTD LimitedLIL Light Intensity Low LUL Lowest Usable Level
LIM Light Intensity LUT Local User Terminal
Medium LV Light and Variable
LIOL Low Intensity LVE Leave, Leaving
Obstacle Lights LVL Level
LIRL Low Intensity Runway Lights LYR Layer, Layered
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N
N North, North Latitude NMI Normal
NAP Noise Abatement NNE North North-East
Procedures NNW North North-West
NAT NAVAID Training NOF International NOTAM OfficeNAV Navigation NOSIG No Significant Change
NAVAID Navigation Aid NOTAM Notice to Airmen
NB Northbound NOV November
NBFR Not Before NOZ Normal Operating Zone
NC No Change NRT No Reported Traffic
NDB Non Directional Radio Beacon Ns Nimbostratus
NE North-East NSC Nil Significant Cloud
NEG Negative, No, NTA No TAF Amendment
permission not granted, or, NTL National
that is not correct NTZ No Transgression Zone
NGT Night NW North-West
NIL None NXT NextNM Nautical Miles
O
OBS Omni Bearing Selector OPMET OperationalOBS Observe, Observed, Meteorological
Observation OPN Operational Notification Message
OBSC Obscure, Obscured, (message type designator)
Obscuring OPN Open, Opening,
OBST Obstacle Opened
OBSTR Obstruction OPR Operator, Operate,
OCA Oceanic Control Area, Operative, Operating,
OCA Obstacle Clearance Altitude Operational
OCC Occulting (light) OPS Operations
OCH Obstacle Clearance Height O/R On Request
OCNL Occasional, OT Other Times
Occasionally OTLK Outlook (used in SIGMETOCT October messages for volcanic ash
OCTA Outside Control Area and tropical cyclones)
OCTR Outside Control Zone OTCMaintain Own Terrian CleanceVisually
OFISOperational Flight InformationSystem OTP On Top
OFZ Obstacle Free Zone OUBD Outboard
OHD Overhead OVC Overcast
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OLDI On Line Data Interchange OW Over Water
OM Outer Marker
P
P. Prohibited Area PO Dust Devils
(followed by identification) POB Persons on BoardPAL Pilot Activated Lighting POH Pilot Operating Handbook
PANS Procedures for Air POSS Possible
Navigation Services PPI Plan Position
PAPIPrecision Approach PathIndicator Indicator
PAR Precision Approach Radar PPR Prior Permission
PARL Parallel Required
PATCPrecision Approach TerrainChart PPSN Present Position
(followed by name/title) PRD Prohibited, Restricted
PAX Passengers and Danger Areas
PCD Proceed, Proceeding PRFG Aerodrome PartiallyPCL Pilot Controlled Lighting Covered by Fog (MET code)
PCN Pavement PRA Precision Approach Radar
PDC Pre-Departure Clearance PRI Primary
PEC Pressure Error Correction PRI Pulse Recurrence Interval
PERM Permanent PRKG Parking
PFR Preferred Route PRM Precision Runway Monitoring
PH Public Holiday PROB Probable, Probability
PIB Pre-flight Information PROC Procedure
Bulletin PROV Provisional
PILS Practice ILS PS Plus
PJE Parachute Jumping PSG Passing
Exercise PSN PositionPL Ice Pellets PSR Primary Surveillance Radar
Pl Pulse Lenght PSYS Pressure System(s)
PLN Flight Plan PTBL Portable
PM Polar Martime PTN Procedure Turn
PN Prior Notice Required PVT Private
PNR Point of No Return PWR Power
Q
QFE Atmospheric Pressure at QNE Internation Standard
aerodrome Elevation Atmospheric Pressure
QFFAtmospheric Pressure Reducedto QUAD Quadrant
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MSL
QNH Altimeter subscale setting to
obtain elevation or altitude
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R
R Red RH Radio Height
R Restricted Area RIF Re clearance Inflight Clearance
(followed by number) RL Report Leaving
R Right (runway system RLA Relay to
identification) RLLS Runway Lead-in Lighting
RA Rain RMI Radi Magnetic IndicatorRA Resolution Advisory RMK Remark(s)
RAC Rules of the Air and RNA Radia Navigation Aids
Air Traffic Services RNAV Area Navigation
RAD Radius RNP Required Navigation
RAG Ragged Performance
RAG Runway Arresting Gear ROC Rate of Climb
RAS Runway Alignment Indicator ROD Rate of Descent
RAIM Receiver Autonomous Integrity ROFOR Route Forecast (in aeronautical
Monitoring meteorological code)
RAS Radar Advisory Service ROC Rate of Climb
RCA Reach Cruising Altitude, RPI Runway Point of Intercept
RCC Rescue Coordination Centre RPI Radar Position Indicator
RCF Radio Communication Failure RPL Repetitive Flight Plan
RCH Reach, Reaching RPM Revolutions Per Minute
RCL Runway Centre Line RPQ Request Flight Plan
RCLL Runway Centre Line Lights RPS Radar Position Symbol
RCLM Runway Centre Line Marking RPT Regular Public Transport
RDL Radial RQ Require(d)
RDPS Radar Data Processing System RQMT Requirements
RDO Radio RQS Request Supplementary Flight
RDR Radar Plan Message
RE Recent (used to qualify weather RR Report Reaching
phenomena, eg RERA = recent RSC Rescue Sub-Centre
rain) RSP Responder Beacon
REC Receive, Receiver, RSR En route Surveillance Radar
Received RTE Route
REDL Runway Edge Lights RTF Radio Telephone
REF Reference to , Refer RTIL Runway Threshold
REG Registration Identification Lights
RENIL Runway End Lights RTHL Runway Threshold
REP Report, Reported, Light(s)
Centre Reporting RTN Return, Returned,
Reporting Point Returning
REQ Request, Requested RTS Return to Service
RERTE Re Route RTZL Runway Touchdown Zone Light(s)
RES Reserve Fuel RVR Runway Visual Range
RESA Runway End Safety Area RVSM Reduced Vertical
RESTR Restrictions Separation Minimum
REV Review RWY Runway
RFFRescue and Fire FightingServices RX Reciever
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S
S South, South Latitude SMC Surface Movement Control
SA Sand SMR Surface Movement Radar
SAL Supplementary Airline Licence SOC Start of Climb
SALR Saturated Adiabatic Lapse rate SOT Start of TORA(take-off)
SALS
Simple Approach Lighting
System SP Single PilotSAR Search and Rescue SPA Sport Aviation
SARPS Standards and Recommended SPAR Special Aerodrome Report
Practices (ICAO) SPECI Aviation Special Weather in
SARSAT SAR Satellite Assisted Trackingaeronautical meteorologicalcode
SARTIME Time search action required SPFIB Specific Preflight
SAT Saturday Information BulletinSATCOM Satellite Communication satellite SPI Special Position Indicator
SATNAVGlobal Navigation SatelliteSystem SPL Supplementary Flight Plan
SB Southbound SPOT Spotwind (met term)
Sc Stratocumulus SPN Standard Flight Plan
SCT Scattered SQ Squall
SCWD Supercooled Water Droplets SR Sunrise
SDBY Standby SRD Standard Radar Departure
SDC Standard Departure Clearance SRG Short Range
SRR Search and Rescue Region
SE South East SRY Secondary
SEA Sea (used in connection with SS Sandstormsea-surface temperature andstate SS Sunset
of the sea) SSB Single Sideband
SEC Seconds SSE South South-East
SECN Section SSR SecondarySECT Sector Surveillance Radar
SEL SELCAL Code SST Supersonic Transport
SELCAL Selective Calling System SSW South South-WestSEP September St StratusSER Service, Servicing, Served STA Straight in ApproachSEV Severe (used eg to qualify icing STAR Standard Arrival Route
and turbulence report) STD Standard
SFC Surface STF Stratiform
SFL Sequenced Flashing Lights STN Station
SH Showers (followed by STNR Stationary
RA=rain, SN=snow, STODA Supplementary Take-offDistancePL=ice pellets, GR=hail,GS=small STOL Short Take-off and Landing
hail and/or snow pellets or STS Status
combinations thereof, STWL Stopway Light(s)
SHF Super High Frequency SUBJ Subject to
(3,000 to30,000 MHZ) SUN Sunday
SID Standard Instrument Departure SUP Supplement (AIP Supplement)
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SIF Selective Identification SUPPS Regional Supplementary
SIG Significant Procedures
SIGMET Information concerning en route SVBL Serviceable
SIMUL Simultaneous, or Simultaneously SVY Survey Operations
SKC Sky Clear SVFR Special VFRSKED Schedule, Scheduled SW South-West
SLP Speed Limiting Point SWS Soft Wet Surface
SLW Slow, Slowly SWY Stopway
T
... T Bearing (true TMA Terminal Control Area
T Temperature TMG Track Made Good
TA Transition Altitude TNA Turn Altitude
TAC Terminal Area Chart TNS Transitional Surface
TACAN Tactical Air Navigation Aid TOC Top of Climb
TAF Aerodrome Forecast TOD Top of Descent
TAIL Tailwind TODA Take-off Distance AvailableTAR Terminal Area TOP Cloud Top
TAS True Airspeed TORA Take-off RunAvailable
TAX Taxiing, Taxi TP Turning Point
TBA To be advised TR Track
TC Tropical Cyclone TR Transmit/Recieve
TC Tropical Continental Air TRA Temporary Reserved Airspace
TCAS (tee-kas) Traffic Alert TRAN Transition
and Collision Avoidance System TRANS Transmits,
TCH Threshold Crossing Height Transmitter
TCTA Trans-continental Control Area TRL Transition Level
TCU Towering Cumulus TROP Tropopause
TDO Tornado TTF Trend Type ForecastTDZ Touchdown Zone TTL Trend Type Landing Forecast
TEL Telephone TUE Tuesday
TEMPO Temporary, TURB Turbulence
Temporarily T-VASIS T Visual Approach
TFC Traffic Slope Indicator System
TGL Touch and Go Landing (pronounced TEE-VASIS)
TGS Taxiing Guidance System TWR Aerodrome Control Tower
THR Threshold Aerodrome Control
THRU Through TWT Travelling Wave Tube
THU Thursday TWY TaxiwayTIBA Traffic Information TWYL Taxiway Link
Broadcasts by Aircraft TX TransmitterTIL Until TYP Type of Aircraft
TIP Until Past (place) TYPH Typhoon
TKOF Take-off
TM Tropical Martime
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U
UAB Until Advised By UNAP Unable to Approve
UDF UHF Direction Finding Stations UNL Unlimited
UFN Until Further Notice UNLC Unlicensed
UHF Ultra High Frequency UNREL Unreliable
(300 to 3,000 MHZ) U/S Unserviceable
UIR Upper Flight Information Region UTA Upper Control AreaUL Upper Limits UTC Coordinated Universal Time
UNA Unable
V
VA Volcanic Ash VIA By way of
VA Visual Approach VIP Very Important Person
VAC Visual Approach Chart VIS Visibility
(followed by name/title) VLF Very Low FrequencyVAL In Valleys (3 to 30 KHZ)
VAR Magnetic Variation VLR Very Long Range
VASIS Visual Approach VMC Visual Meteorological Conditions
Slope Indicator System VOLMET Meteorological Information for
VCD Vertical Coverage Diagram Aircraft in Flight
VCY Vicinity VOR VHF Omni-directional
VD Visual Departure Radio Range (OMNI)
VDF VHF Direction Finding Station VORTAC VOR and TACAN (co-located)
VER Vertical VRB Variable
VFR Visual Flight Rules VSI Vertical speed Indicator
VHF Very High Frequency VSP Variable System parametres
(30 to 300 MHZ) VTC Visual Terminal ChartVHF NAV VHF Navigation receiver for VOR VTOL Vertical Take Off/Landing Aircraft
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W
W West, West Longitude WIND Wind (used in Connection with
W White Direction and speed)
WAC World Aeronautical WINTEM Forecast upper wind and
Chart - ICAO1:11,000,000 temperature at Specified points
(followed by name/title) (in Aeronautical met code)
WAFC World Area Forecast Centre WIP Work in ProgressWB Westbound WKN Weaken, Weakening
WDI Wind Direction WNW West North-West
Indicator WO Without
WDSPR Widespread WPT Way-point
WED Wednesday WRNG Warning
WEF With Effect From , WS Wind Shear
Effective From WSW West South-West
WGS-84 World Geodetic System - 1984 WT Weight
WI Within WTSPT Water Spout
WIE With Immediate Effect WWW World Wide Web
Effective Immediately Wx Weather
WILCO Will Comply
X Y
X Cross Y Yellow
XBAR Crossbar(of approach lighting YR Your/s
system)
XNG Crossing Z
XS Atmospherics Z Coordinated Zone Universal Time
(in meteorological messages)