Abbreviations and acronyms

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Abbreviations and acronyms

This list covers general and meteorological abbreviations and acronyms which may be found throughout the Guide and on associated charts, or which are used in NOTAM, AIP Supplements  and meteorological messages and documentation.

A

A/A

Air to Air

A/G

Air-to-ground

AACC

Area Approach Control Centre

AAD

Assigned altitude deviation

AAIS

Automatic Aerodrome Information Service

AAL

Above aerodrome level

ABI

Advance boundary information

ABM

Abeam

ABN

Aerodrome beacon

ABT

About

ABV

Above

AC

Altocumulus

ACARS*

Aircraft communication aAddressing and reporting system (pronounced ‘ay-cars’)

ACAS*

Airborne Collision Avoidance System

ACCID

Initial notification of an aircraft accident

ACC†

Area control centre

ACD

Airways clearance delivery

ACFT

Aircraft

ACK

Acknowledge

ACN

Aircraft classification number

ACPT

Accept, accepted

ACT

Active, activated, activity

AD

Aerodrome

ADC

Aerodrome chart

ADDGM

Aerodrome diagrams

ADDN

Addition, additional

ADF†

Automatic direction finding equipment

ADIZ†

Air defence identification zone

ADJ

Adjacent

ADMS

Aeronautical database management system

ADR

Advisory route

ADS-B†

Automatic dependent surveillance-broadcast

ADS-C†

Automatic dependent surveillance-contract

ADZ

Advise

AEP

Aerodrome emergency plan

AERIS*

Automatic En Route Information Service

AFIL

Flight notification (filed in the air, or indicating the position at which ATS services will first be required)

AFM

Yes, affirm, affirmative, that is correct

AFRU

Aerodrome frequency response unit

AFS

Aeronautical fixed service

AFT

After

AFTN†

Aeronautical fixed telecommunication network

AFZ

Australian fishing zone(s)

AGA

Aerodromes, air routes and ground aids

AGL†

Above ground level

AGN

Again

AH

After hours

AIC†

Aeronautical information circular

AIP†

Aeronautical Information Publication

AIRAC*

Aeronautical Information Regulation and Control

AIREP*

Air report

AIRMET*

Information in plain language concerning weather significant to light aircraft operations at or below 10,000 ft

AIS†

Aeronautical Information Service

AL

Approach lights

ALA†

Aircraft landing area (for the purpose of CAR 92(1)(d))

ALERFA*

Alert phase

ALM

Aircraft landing minima

ALR

Alerting message

ALS

Approach lighting system

ALT

Altitude

ALTN

Alternate, alternating (light alternates in colour)

ALTN

Alternate (aerodrome)

AMD

Amend, amended

AMDT

Amendment (AIP Amendment)

AMSL†

Above mean sea level

ANC

Aeronautial chart 1:500,00 (followed by name/title)

AOC

Aerodrome obstruction chart (followed by name/title)

AOC

Air operator’s certificate

AP

Airport

APAPI*

Abbreviated precision approach path indicator (pronounced ‘ay-papi’)

APCH

Approach

APDC

Aircraft parking/docking chart (followed by name/title)

APN

Apron

APP

Approach control, approach control office, approach control service

APR

April

APRX

Approximate, approximately

APSG

After passing

APV

Approve, approved, approval

AQZ

Area QNH Zone

ARFL

Aeroplane reference field length

ARN

Aviation reference number

ARNG

Arrange

ARP

Aerodrome reference point

ARP

Air report  (message type designator)

ARR

Arrive, arrival

ARS

Special air report  (message type designator)

AS

Altostratus

ASAP†

As soon as possible

ASC

Ascent to, ascending to

ASDA

Accelerate-stop distance available

ASE

Altmetry system error

A-SMGCS

Advanced surface movement guidance and control system

ASPH

Asphalt

ASR

Area surveillance radar

ATA†

Actual time of arrival

ATC†

Air traffic control (in general)

ATD†

Actual time of departure

ATFM

Air traffic flow management

ATIS*

Automatic terminal information service

ATM

Air traffic management

ATP

At (Time or Place)

ATS

Air traffic services

ATTN

Attention

AT-VASIS*

Abbreviated ‘T’ visual approach slope indicator system (pronounced ‘ay-tee-vasis’)

ATZ

Aerodrome traffic zone

AUG

August

AUTH

Authorised, authorisation

AUTO

Fully automated report  (met code)

AUW

All-up weight

AUX

Auxiliary

AVBL

Available

AVG

Average

AVGAS*

Aviation gasoline

AVM

Abrupt vertical manoeuvres  (by the military)

AWIS

Aerodrome Weather Information Service

AWK

Aerial work

AWS

Automatic weather station

AWY

Airway

AZM

Azimuth

B

B

Blue

BASE*

Cloud base

BCFG

Fog patches

BCN

Beacon (aeronautical ground light)

BCST

Broadcast

BCTA

Base of CTA (only on charts)

BDRY

Boundary

BECMG

Becoming

BFR

Before

BKN

Broken (cloud descriptor)

BL

Blowing (followed by: DU = dust; SA = sand; SN = snow)

BLDG

Building

BLO

Below clouds

BLW

Below

BOMB

Bombing

BR

Mist

BRF

Brief/short (to indicate type of approach)

BRG

Bearing

BRKG

Braking

BS

Broadcasting station (commercial)

BTL

Between layers

BTN

Between

C

C

Centre (runway)

C/L

Centre line

CA/GRS

Certified air / ground radio service

CAO

Civil Aviation Order

CAR

Civil Aviation Regulation

CASA

Civil Aviation Safety Authority

CAT

Clear air turbulence

CAT*

Category

CAVOK*

Visibility, cloud and present weather better than prescribed values of conditions (pronounced ‘cav-okay’)

CB†

Cumulonimbus

CC

Cirrocumulus

CCTS

Circuits

CEN

En route and area ATC unit

CET

Clearance expiry time

CF

Change frequency to

CFM

Confirm, I confirm

CH

Channel

CHTR

Charter

CI

Cirrus

CIT

Near, over large town(s)

CIV

Civil

CK

Check

CLA

Clear type of ice formation

CLBR

Calibration

CLD

Cloud

CLG

Calling

CLIAS

Climbing indicated airspeed

CLR

Clear, cleared to, clearance

CLSD

Closed, close, closing

CM

Centimetre

CMB

Climb to, climbing to

CMPL

Completion, completed, complete

CMSD

Commissioned

CNL

Cancel, cancellation

CNL

Flight plan cancellation message

CNS

Communications, navigation and surveillance

COM

Communications

CONC

Concrete

COND

Condition

CONS

Continuous

CONST

Construction, constructed

CONT

Continue(s), continued

COOR

Coordinate, coordinated

COORD

Coordinates

COP

Change-over point

COR

Correct, corrected, correction

COS

Conical surface

COT

At the coast, coastal

COV

Cover, covered, covering

CPDLC†

Controller pilot datalink communication

CRC

Cyclic redundancy check

CRZ

Cruise

CS

Cirrostratus

CS

Call sign

CTAF*

Common traffic advisory frequency

CTA†

Control area

CTC

Contact

CTL

Control

CTN

Caution

CTR

Control zone

CU

Cumulus

CUF

Cumuliform

CUST

Customs

CVR

Cockpit voice recorder

CWY

Clearway

C ˚

Degrees Celsius (Centigrade)

D

D

Danger area (followed by identification)

DA

Decision altitude

DAH
Designated airspace handbook
DAP

Departure and approach procedures

D-ATIS*

Data link automatic terminal information service (pronounced ‘dee-atis’)

DCKG

Docking

DCMSD

Decommissioned

DCPC†

Direct controller-pilot communications

DCT

Direct (in relation to flight plan clearance and type of approach)

DEC

December

DEG

Degrees

DEP

Depart, departure, departed, departing, departure message

DER

Departure end of runway

DES

Descend to, descending to

DEST

Destination

DETRESFA*

Distress Phase

DEV

Deviation, deviating

DFDR

Direct flight data recorder

DF†

Direction finder/finding

DH

Decision height

DIF

Diffuse

DISP

Displaced

DIST

Distance

DIV

Diversion, divert, diverting

DLA

Delay, delayed

DLIC

Data link initiation capability

DLY

Daily

DME†

Distance measuring equipment

DNG

Danger, dangerous

DOC

Documents

DOM

Domestic

DP

Dew point temperature

DPT

Depth

DR

Low Drifting (followed by: D U = dust; SN=snow; SA = sand)

DRG

During

DR†

Dead reckoning

DS

Duststorm

DTAM

Descend to and maintain

DTG

Date-time group

DTHR

Displaced runway threshold

DTRT

Deteriorate, deteriorating

DU

Dust

DUC

Dense upper cloud

DUR

Duration

D-VOLMET

Data link VOLMET

DVOR

Doppler VOR

DZ

Drizzle

E

E

East, east longitude

EAT

Expected approach time

EB

Eastbound

EET†

Estimated elapsed time

EHF

Extremely high frequency  30,000 to 300,000 MHZ)

ELEV

Elevation

ELR

Extra long range

ELT†

Emergency locator transmitter

EM

Emission

EMBD

Embedded in a layer (to indicate cumulonimbus embedded in layers of other clouds)

EMERG

Emergency

ENDCE

Endurance

ENE

East north-east

ENG

Engine

ENR

En route

EOBT

Estimated off blocks time

EPIRB*

Electronic position indicating radio beacon (marine term)

EQPT

Equipment

ERC†

En Route Chart

ERSA*†

En Route Supplement Australia

ESE

East South-East

EST

Estimate, estimate as message type indicator

ETA†

Estimated Time of Arrival, Estimating Arrival

ETD†

Estimated time of departure, estimating departure

ETO

Estimated time over significant point

ETOPS

Extended range operations b y aeroplanes with two turbine power units

EV

Every

EXC

Except

EXER

Exercises, exercising, to exercise

EXP

Expect, expected, expecting

EXTD

Extend, extending, extended

F

F

Fixed (chart symbol)

FAC

Facility, facilities

FAF

Final approach fix

FAP

Final approach point

FATO

Final approach and take-off area

FAX*

Facsimile transmission

FBL

Light (to indicate the intensity of WX phenomena, interference or static reports, for example FBL RA = light rain)

FC

Funnel cloud (tornado or water spout)

FCST

Forecast

FDPS

Flight data processing system

FEB

February

FEW

Few (cloud descriptor)

FFR

Flood, fire relief

FG

Fog

FIA†

Flight information area

FIC†

Flight information centre

FIR†

Flight information region

FIS†

Flight information service

FL

Flight level

FLD

Field

FLG

Flashing

FLR

Flares

FLT

Flight

FLTCK

Flight check

FLUC

Fluctuating, fluctuation, fluctuated

FLW

Follow(s), following

FLY

Fly, flying

FM

From

FM

From (followed by time weather change is forecast to begin)

FMS†

Flight management system

FMU

Flow management unit

FN

‘Fly neighbourly’ area

FNA

Final approach

FPD

Flight plan designator

FPL

Filed flight plan message

FPM

Feet per minute

FPR

Flight plan route

FR

Fuel remaining

FREQ

Frequency

FRI

Friday

FRNG

Firing

FRQ

Frequent

FSL

Full stop landing

FSP

Fish spotting

FST

First

FS†

Flight service (in general)

FT

Feet

FU

Smoke

FXD

Fixed

FZ

Freezing

FZDZ

Freezing drizzle

FZFG

Freezing fog

FZL

Freezing level

FZRA

Freezing rain

G

G
Green
G

Variation from mean wind speed (gusts) (MET – in METAR/SPECI and TAF code forms)

GAAP

General aviation aerodrome procedures

GAF

Graphical area forecasts

GBAS†

Ground-based augmentation

GCA†

Ground-controlled approach

GEN

General

GEO

Geographic, true

GES

Ground earth station

GFY

Glider flying

GLD

Glider

GLONASS*

Global orbiting navigation satellite system (pronounced ‘glo-nas’)

GLS†

GBAS landing system

GND

Ground

GNDCK

Ground check

GNS

Global navigation system

GNSS†

Global navigation satellite system

GP

Glide path

GP FLG

Group flashing (followed by number) (in conjunction with aerodrome lighting)

GPI

Glide path intercept

GPS†

Global positioning system

GR

Hail

GRAD

Minimum required climb gradient

GRASS*

Grass landing area

GRVL

Gravel

GS
Ground speed
GS

Small hail and/or snow pellets

GUND

Geoid undulation

GWPT

Grid point wind and temperature

H

H

High pressure are of the centre of high pressure (MET)

H24†

Continuous day and night service

HAA

Height above aerodrome

HAT

Height above threshold

HBN

Hazard beacon

HDG

Heading

HDS

Hours of daylight saving

HEL

Helicopter

HF†

High frequency ( 3000 to 30,000 KHZ)

HGT

Height, height above

HIAL*

High intensity approach lighting

HIOL

High intensity obstacle lighting

HIRL

High intensity runway lighting

HJ†

Sunrise to sunset

HLDG

Holding

HLS

Helicopter landing site

HN†

Sunset to sunrise

HO

Service available to meet operational requirements

HOSP

Hospital aircraft

HPA

Hectopascal

HR

Hours

HS

Homestead

HS

Service available during hours  of scheduled operations

HSL

Hold short lights

HURCN

Hurricane

HVY
Heavy
HVY

Heavy (to indicate the intensity of WX phenomena, for example HVY RA = heavy rain)

HX

No specific working hours

HYR

Higher

HZ

Haze

HZ

Hertz

HZS

Horizontal surface

I

IAC

Instrument approach chart (followed by name/title)

IAF

Initial approach fix

IAL†

Instrument approach and landing

IAO

In and out of clouds

IAS†

Indicated air speed

IBN

Identification beacon

IC

Ice crystals ( meteorological code)

ICAO*

International Civil Aviation Organisation

ICE

Icing, ice

ID

Identifier, identify

IDENT*

Identification

IF

Intermediate fix or intermediate approach fix

IFF†

Identification friend/foe

IFR†

Instrument flight rules

ILS†

Instrument landing system

IM

Inner marker

IMC†

Instrument meteorological conditions

IMG

Immigration

IMPR

Improve, improving, improvement

IMT

Immediate, immediately

INBD

Inbound

INCERFA*

Uncertainty phase

INC†

In cloud

INFO*

Information

INOP*

Inoperative

INSTL

Install, installed, installation

INSTR

Instrument

INS†

Inertial navigation system

INT

Intersection

INTER*

Intermittent, intermittently

INTL

International

INTRG

Interrogator

INTRP

Interrupt, interruption, interrupted

INTSF

Intensify, intensifying

INTST

Intensity

ISA*

International standard atmosphere

ISB

Independent sideband

ISOL

Isolated

IWI

Illuminated wind indicator

J

JAN

January

J-BAR*

Jet barrier

JF

Saturday, Sunday and public holidays

JO

Monday to Friday except public holidays

JTST

Jet stream

JUL

July

JUN

June

K

KG

Kilograms

KHZ

Kilohertz

KM

Kilometres

KMH

Kilometres per hour

KPA

Kilopascals

KT

Knots

KW

Kilowatts

L

L

Left (runway identification)

L

Low pressure area or the centre of low pressure (MET)

LAHSO

Land and hold short operations

LAN

Inland

LAT*

Latitude

LCA

Locally, location, located, local

LDA

Landing distance available

LDG

Landing

LDI

Landing direction indicator

LEN

Length

LF

Low frequency (30 to 300 KHZ)

LGT

Light, lighting

LGTD

Lighted

LIH

Light intensity high

LIL

Light intensity low

LIM

Light intensity medium

LIOL

Low intensity obstacle lights

LIRL

Low intensity runway lights

LJR

Low jet route

LLN

Low-level navigation ( by the military)

LLO

Low-level operations (by the military)

LMT

Local mean time

LOC

Locally, location, located, local

LOE

Lane of entry

LONG*

Longitude

LRG

Long range

LSALT

Lowest safe altitude

LTD

Limited

LUL

Lowest usable level

LV

Light and variable (wind)

LVE

Leave, leaving

LVL

Level

LYR

Layer, layered

M

M

Metres (preceded by figures)

M

Mach number ( followed by figures)

MAE

Men and equipment

MAG

Magnetic

MAHF

Missed approach holding fix

MAINT

Maintenance

MAN

Manual

MAP

Aeronautical maps and charts

MAP

Missed approach procedure

MAPT

Missed approach point

MAR

March

MAR

At sea

MATF

Missed approach turning fix

MAX*

Maximum

MBST

Microburst

MDA

Minimum descent altitude

MDF

Medium frequency direction finding station

MEA†

Minimum en-route altitude

MED

Medical

MEHT

Minimum eye height over threshold

MET*

Meteorological, meteorology

METAR*

Aviation routine weather report (in aeronautical meteorological code)

METRAD

MET Radar

MET REPORT

Aviation routine weather report

MF

Medium frequency ( 300 to 3000 KHZ)

MHZ

Megahertz

MI

Shallow (met)

MIFG

Shallow fog

MIL

Military

MIN

Minutes

MIOL

Medium intensity obstacle lights

MIRL

Medium intensity runway lights

MISC

Miscellaneous

MKR

Marker radio beacon

MLJ

Military low jet

MLJR

Military low jet route

MLS†

Microwave landing system

MLW

Maximum landing weight

MM

Middle marker

MNM

Minimum

MNT

Monitor, monitoring, monitored

MNTN

Maintain, maintained, maintaining

MO

Meteorological office

MOA

Military operating area

MOC

Minimum obstacle clearance (required)

MOD

Moderate  (to indicate the intensity o f WX phenomena, interface o r static reports; for example, MOD RA = moderate rain)

MON

Monday

MON

Above mountains

MOPS*

Minimum operational performance standards

MOV

Move, moved, moving, movement

MOWP

Method of working plan

MPS

Meters per second

MRG

Medium range

MRP

ATS/MET Reporting Point

MS

Minus

MSA†

Minimum sector altitude

MSG

Message

MSL

Mean sea level

MSSR

Monopulse secondary surveillance radar

MT

Mountain

MTOW

Maximum take-off weight

MTP

Maximum tyre pressure

MTW

Mountain waves

MVA

Minimum vector altitude

MWO

Meteorological watch office

MX

Mixed type of ice formation (white and clear)

N

N

North, north latitude

NAIPS

National Aeronautical Information Processing System

NAP

Noise abatement procedures

NAT

NAVAID training

NAV

Navigation

NAVAID

Navigation aid

NB

Northbound

NBFR

Not before

NC

No change

NCD

No cloud detected (by ceilometer) (in automated METAR/SPECI)

NDB†

Non-directional Radio Beacon

NDV

No-directional Variation reporting capability (by vismeter)  in automated METAR/SPECI)

NE

North-east

NEG

Negative, no, permission not granted, or that is not correct

NGT

Night

NIL*

None

NIS
NAIPS internet service
NM

Nautical miles

NML

Normal

NNE

North north-east

NNW

North north-west

NOF

International NOTAM Office

NOTAM*

Notice to airmen

NOV

November

NOZ†

Normal operating zone

NPA

Non-precision approach

NR

Number

NS

Nimbostratus

NSC

Nil significant cloud

NSW

Nil significant weather

NTA

No TAF amendment

NTL

National

NTZ†

No transgression zone

NVG

Night vision goggles (by the military)

NW

North-west

NXT

Next

O

O/R

On request

OBS

Observe, observed, observation

OBSC

Obscure, obscured, obscuring

OBST

Obstacle

OBSTR

Obstruction

OCA

Obstacle clearance altitude

OCA†

Oceanic control area

OCC

Occulting (light)

OCNL

Occasional, occasionally

OCT

October

OCTA†

Outside control area

OCTR†

Outside control zone

OFZ

Obstacle free zone

OHD

Overhead

OK

We agreed, or it is correct

OLDI†

On line data interchange

OM

Outer marker

OPA

Opaque, white type of ice formation

OPMET

Operational meteorological

OPN
Open, opening, opened
OPN

Operational notification message

OPR

Operator, operate, operative, operating, operational

OPS

Operations

OT

Other times

OTLK

Outlook (in SIGMET messages for volcanic ash and tropical cyclones)

OTP

On top

OUBD

Outboard

OVC

Overcast

OW

Over water

P

P
Prohibited area (followed by identification)
PAL*

Pilot activated lighting

PANS

Procedures for air navigation services

PAPI*

Precision approach path indicator

PAR

Precision approach radar

PARL

Parallel

PAX

Passengers

PBN

Performance-based navigation

PCD

Proceed, proceeding

PCL

Pilot controlled lighting

PCN

Pavement classification number

PDC†

Pre-departure clearance

PER

Performance

PERM

Permanent

PFR

Preferred route

PH

Public holiday

PIB

Pre-flight information bulletin

PILS

Practice ILS

PJE

Parachute jumping exercise

PL

Ice pellets

PLN

Flight plan

PLVL

Present level

PN

Prior notice required

PNR†

Point of no return

PO

Dust devils

POB†

[Number] persons on board

POSS

Possible

PPI†

Plan position indicator

PPR

Prior permission required

PPSN

Present position

PRD

Prohibited, restricted and danger areas

PRFG

Aerodrome partially covered by fog (meteorological code)

PRI

Primary

PRKG

Parking

PROB*

Probable, probability

PROC

Procedure

PROV

Provisional

PS

Plus

PSG

Passing

PSN

Position

PSP

Pierced steel plank

PSR†

Primary surveillance radar

PTBL

Portable

PTN

Procedure turn

PVT

Private

PWR

Power

Q

QNH†

Altimeter subscale setting t o obtain elevation or altitude

QUAD

Quadrant

R

R

Red

R

Restricted area (followed by number)

RA

Rain

RAD

Radius

RAFC

Regional area forecast centre

RAG

Ragged

RAG

Runway arresting gear

RAIM*

Receiver autonomous intergity monitoring

RAPIC*

Radar picture (MET)

RASC*

Regional AIS System Centre

RCA

Reach cruising altitude

RCC†

Rescue Coordination Centre

RCH

Reach, reaching

RCL

Runway centreline

RCLL

Runway centreline lights

RDL

Radial

RDO

Radio

RE

Recent (to qualify weather phenomena, for example RERA = recent rain)

REC

Receive, receiver, received

REDL

Runway edge lights

REF

Reference to, refer to

REG

Registration

RENL

Runway end lights

REP

Report, reported, reporting, reporting point

REQ

Request, requested

RERTE

Re-route

RES

Reserve fuel

RESA

Runway end safety area

RESTR

Restrictions

REV

Review

REC

Regional forecasting centre (MET)

RFF

Rescue and fire fighting services

RH

Radio height

RHC

Right-hand circuit

RIF

Reclearance in flight

RIS*

Rader/ADS-B Information Service

RL

Report leaving

RLA

Relay to

RLLS

Runway lead-in lighting

RMK

Remark(s)

RNAV*

Area navigation

RNP

Required navigation performance

ROBEX*

Regional OPMET bulletin exchanges recommended practices (ICAO)

ROC

Rate of climb

ROD

Rate of descent

ROFOR*

Route forecast (in aeronautical meteorological code)

RPI

Runway point of intercept

RPI†

Radar position indicator

RPT

Regular public transport

RPT

Repeat, I repeat

RQ

Require(d)

RQMNTS

Requirements

RR

Report reaching

RSC

Rescue sub-centre

RSCD

Runway surface condition

RSP

Responder beacon system

RSR

En-route surveillance radar

RTE

Route

RTF

Radio telephone/telephony

RTHL

Runway threshold light(s)

RTIL

Runway threshold identification lights

RTN

Return, returned, returning

RTS

Return to service

RTZL

Runway touchdown zone lights

RVR†

Runway visual range

RVSM

Reduced vertical seperation minimum

RWS

Runway strip

RWY

Runway

S

S

South, south latitude

SA

Sand

SALS

Simple approach lighting system

SAR*

Search and rescue

SARPS

Standards and recommended practices (ICAO)

SARTIME*

Time search action required

SAT

Saturday

SATCOM*

Satellite communication

SB

Southbound

SC

Stratocumulus

SCT

Scattered

SDBY

Standby

SDC

Standard departure clearance

SE

South-east

SEA

Sea (in connection with sea-surface temperature and state of the sea)

SEC

Seconds

SECT

Section, sector

SELCAL*

Selective calling system

SEP

September

SER

Service, servicing, served

SEV

Severe (for example, to qualify icing and turbulence report)

SFC

Surface

SFL

Sequenced flashing lights

SG

Snow grains

SH

Showers (followed by: RA = rain; SN = snow; PE = ice pellets; GR = hail; GS = small hail and/ or snow pellets; or combinations thereof; for example, SHRASN = showers of rain and snow)

SHF

Super high frequent  3,000 to 30,000 MHZ)

SID*

Standard instrument departure

SIF

Selective identification

SIGMET*

Information concerning en-route weather phenomena which may affect the safety of aircraft operations

SIGWX

Significant weather

SIMUL

Simultaneous, simultaneously

SITREP

Situation report

SKC

Sky clear

SKED*

Schedule, scheduled

SLP

Speed limiting point

SLW

Slow, slowly

SMCV†

Surface movement control vehicles

SMC†

Surface movement control

SMR

Surface movement radar

SN

Snow

SNOWTAM*

A special series

SOC

Start of climb

SOT

Start of TORA (take-off)

SP

Single pilot

SPA

Sport aviation

SPI
Special position indicator
SPECI*

Aviation special weather (in aeronautical meteorological code)

SPFIB

Specific preflight information bulletin

SPOT*

Spotwind

SQ

Squall

SR

Sunrise

SRD

Standard radar departure

SRG

Short range

SRR†

Search and rescue region

SRY

Secondary

SS

Sandstorm

SS

Sunset

SSB

Single sideband

SSE

South south-east

SSR

Secondary surveillance radar

SST

Supersonic transport

SSW

South south-west

ST

Stratus

STA

Straight-in approach

STAR*

Standard arrival route

STD

Standard

STF

Stratiform

STN

Station

STNR

Stationary

STODA

Supplementary take-off distance

STOL

Short take-off and landing

STS

Status

STWL

Stopway light(s)

SUBJ

Subject to

SUN

Sunday

SUP

Supplement (AIP Supplement)

SUPPS

Regional supplementary procedures

SVCBL

Serviceable

SVY

Survey operations

SW

South-west

SWS

Soft wet surface

SWY

Stopway

T

T

Bearing (true)

T

Temperature

TA

Transition altitude

TAC*

Terminal area chart

TACAN*

Tactical air navigation aid

TAF*

Aerodrome forecast

TAIL*

Tailwind

TAR

Terminal area survelliance area

TAS†

True airspeed

TAT*

Terminal area thunderstorm service (meteorological)

TAX

Taxiing, Taxi

TBA

To be advised

TC

Tropical cyclone

TCAC

Tropical cyclone advisory centre

TCAS*

Traffic alert and collision avoidance system ( pronounced ‘tee-kas’)

TCH

Threshold crossing height

TCTA

Trans-continental control area

TCU

Towering cumulus

TDO

Tornado

TDZ

Touchdown zone

TECR

Technical reason

TEL

Telephone

TEMPO*

Temporary, temporarily

TFC

Traffic

TFR

Terrain following radar ( by the military)

TGL

Touch-and-go landing

THR

Threshold

THRU

Through

THU

Thursday

TIBA

Traffic information broadcasts by aircraft

TIL*

Until

TIP

Until past (followed by place name)

TKOF

Take-off

TL

Until

TLW

Time limited WIP (work in progress)

TMA†

Terminal control area

TN

Indicator for minimum temperature (MET – in TAF code form)

TNA

Turn altitude

TNH

Turn height

TNS

Transitional surface

TOC

Top of climb

TODA

Take-off distance available

TOP

Cloud top

TORA

Take-off run available

TP

Turning point

TR

Track

TRA

Temporary reserved airspace

TRAN

Transition

TRANS

Transmits, transmitter

TRA†

Temporary restricted area

TRL

Transition level

TROP

Tropopause

TS

Thunderstorm (followed by: RA = rain; SN = snow; PE = ice pellets; GR = hail; GS=small hail and/or snow pellets; or combinations thereof; for example TSRASN = thunderstorm with rain and snow)

TTF

Trend type forecast

TUE

Tuesday

TURB

Turbulence

T-VASIS*

‘T’ visual approach slope indicator system (pronounced ‘tee-vasis’)

TWR

Aerodrome control tower, aerodrome control

TWY

Taxiway

TWYL

Taxiway link

TX

Indicator for maximum temperature  MET – in TAF code form)

TYP

Type of aircraft

TYPH

Typhoon

U

U/S

Unserviceable

UAB

Until advised by

UDF†

UHF direction finding stations

UFN

Until further notice

UHDT

Unable higher due traffic

UHF†

Ultra high frequency ( 300 to 3,000 MHZ)

UIR

Upper flight information region

UL

Upper limits

UNA

Unable

UNAP

Unable to approve

UNL

Unlimited

UNLC

Unlicensed

UNREL

Unreliable

UP

Unknown precipitation

UTA

Upper control area

UTC†

Coordinated universal time

V

V

Variation from mean wind speed (MET – in METAR/SPECI code forms)

VA

Volcanic ash

VAAC

Volcanic ash advisory centre

VAL

In valleys

VAR

Magnetic variation

VASIS*

Visual approach slope indicator system

VC

Vicinity (of the aerodrome) (followed by: FG = fog;  FC = funnel cloud; PO = dust/sand whirls; BLDU = blowing dust; BLSA = blowing sand;  BLSN = blowing snow; for example VCFG = vicinity fog)

VCY

Vicinity

VDF†

VHF direction finding station

VER

Vertical

VFR†

Visual flight rules

VHF†

Very high frequency  (30 to 300 MHZ)

VIA

By way of

VIP†

Very important person

VIS

Visibility

VLF

Very low frequency  (3 to 30 MHZ)

VLR

Very long range

VMC†

Visual meteorological conditions

VNC

Visual navigation chart

VOLMET*

Meteorological information for aircraft in flight

VOR†

VHF omni-directional radio range (OMNI)

VRB

Variable

VTC

Visual terminal chart

VTOL

Vertical take-off and landing

VV

Vertical visibility  (MET – in METAR/SPECI and  TAF code forms)

W

W

West, west longitude

W

White

WAC

World aeronautical chart –  ICAO 1:1,000,000  (followed by name/title)

WAFC

World Area Forecast Centre

WATIR

Weather and terminal information reciter

WB

Westbound

WDI

Wind direction indicator

WDSPR

Widespread

WED

Wednesday

WEF

With effect from, effective from

WGS-84

World Geodetic System – 1984

WI

Within

WID

Width

WIE

With immediate effect,  effective immediately

WINTEM

Forecast upper wind and temperature at specified points (in aeronautical meteorological code)

WIP

Work in progress

WKN

Weaken, weakening

WNW

West north-west

WO

Without

WPT

Waypoint

WRNG

Warning

WS

Wind shear

WSW

West south-west

WT

Weight

WTSPT

Water spout

WX

Weather

WWW

World wide web

X

X

Cross

XBAR

Crossbar (of approach lighting system)

XNG

Crossing

XS

Atmospherics

Y

Y

Yellow

YCZ

Yellow caution zone

YR

Your(s)

Z

Z

Coordinated universal time  (in meteorological messages)

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