A
|
|
A
|
Amber
|
ALRS
|
Alerting service
|
|
A/A
|
Air- to Air
|
ALS
|
Approach lighting system
|
|
AA*
|
Approved Agency
|
ALT
|
Altitude
|
|
AAI*
|
Airports Authority of India
|
ALTN
|
Alternate or alternating (light alternates in colour ) or alternate (aerodrome)
|
|
AAL
|
Above aerodrome level
|
AMC*
|
Airspace Management Cell
|
|
ABAS*
|
Aircraft-Based Augmentation System
|
|
|
|
ABM
|
Abeam
|
AMD
|
Amend or amended
|
|
ABT
|
About
|
AMDT
|
Amendment
|
|
ABV
|
Above
|
AMS
|
Aeronautical mobile service
|
|
AC*
|
Advisory Circular
|
|
|
|
ACAS
|
Airborne collision avoidance system
|
AMSL
|
Above mean sea level
|
|
ACC
|
Area control centre or Area control
|
AMSS
|
Aeronautical mobile satellite service
|
|
ACCID
|
Notification of an aircraft accident
|
AOC
|
Aerodrome obstacle chart
|
|
ACFT
|
Aircraft
|
AP
|
Airport
|
|
ACK
|
Acknowledge
|
APCH
|
Approach
|
|
ACL
|
Altimeter check location
|
APN*
|
Apron
|
|
ACPT
|
Accept or accepted
|
APP
|
Approach control office or approach control or approach control services
|
|
ACS
|
Aeronautical Communication Station
|
APR
|
April
|
|
ACT
|
Active or activated or activity
|
APRX
|
Approximate or approximately
|
|
AD
|
Aerodrome
|
APV
|
Approve or approved or approval
|
|
ADA
|
Advisory Area
|
ARC*
|
Aviation research centre
|
|
ADC*
|
Air Defence Clearance
|
ARFOR
|
Area forecast
|
|
ADDN
|
Addition or Additional
|
ARNG
|
Arrange
|
|
ADF
|
Automatic direction finding equipment
|
ARO
|
Air traffic services reporting office
|
|
ADIZ
|
Air Defence identification zone
|
ARP
|
Aerodrome reference point
|
|
ADJ
|
Adjacent
|
ARR
|
Arrive or arrival (message type designator)
|
|
ADR
|
Advisory route
|
ARP
|
Air Report (message type designators)
|
|
ADS
|
Automatic dependent surveillance
|
AS
|
Altostratus
|
|
ADVS
|
Advisory service
|
ASC
|
Ascent or ascending to
|
|
ADZ
|
Advice
|
ASDA
|
Accelerated stop distance available
|
|
AES
|
Aircraft earth station
|
ASM*
|
Airspace Management
|
|
AFIL
|
Flight plan filled in the air
|
ASPH
|
Asphalt
|
|
AFIS
|
Aerodrome flight information service
|
ATA
|
Actual time of arrival
|
|
AFM*
|
Aircraft Flight Manual
|
|
|
|
AFS
|
Aeronautical fixed service
|
ATC
|
Air traffic control
|
|
AFT
|
After (time or place)
|
ATD
|
Actual time of departure
|
|
A/G
|
Air to ground
|
ATFM
|
Air traffic flow management
|
|
AGA
|
Aerodrome , air routes and ground aids
|
ATIS
|
Automatic terminal information service
|
|
AGL
|
Above ground level
|
ATM
|
Air traffic management
|
|
AGN
|
Again
|
ATN
|
Aeronautical telecommunication network
|
|
AIC
|
Aeronautical information circular
|
ATS
|
Air traffic services
|
|
AIP
|
Aeronautical information publication
|
ATTN
|
Attention
|
|
AIRAC
|
Aeronautical information regulation and control
|
ATZ
|
Aerodrome traffic zone
|
|
AIREP
|
Air-report
|
AUG
|
August
|
|
AIS
|
Aeronautical Information Services
|
AUM
|
Airspace Use Plan
|
|
ALA
|
Alighting area
|
AUTH
|
Authorized or authorization
|
|
ALERFA
|
Alert phase
|
AUW
|
All up weight
|
|
ALR
|
Alerting (message type designator)
|
AUX
|
Auxiliary
|
|
AVASIS
|
Abbreviated visual approach slope indicator system
|
AWYAVDGS
|
Airway
|
|
AVBL
|
Available
|
AZMAWY
|
AzimuthAirway
|
|
AVGAS
|
Aviation gasoline
|
AZM
|
Azimuth
|
B
|
|
B
|
Blue
|
BLW
|
Below
|
|
BA
|
Braking action
|
BLO
|
Below clouds
|
|
Baro-VNAV*
|
Barometric Vertical Navigation
|
BLSN
|
Blowing snow
|
|
BASE
|
Cloud base
|
BPSK*
|
Binary Phase Shift Keying
|
|
BCN
|
Beacon
|
BRG
|
Bearing
|
|
BCFG
|
Fog patches
|
BRKG
|
Breaking
|
|
BCST
|
Broadcast
|
BRLOS*
|
Beyond radio line-of-sight
|
|
BDRY
|
Boundary
|
BTN
|
Between
|
|
BECMG
|
Becoming
|
BVLOS*
|
Beyond visual line-of-sight
|
|
BFR
|
Before
|
BLO
|
Below clouds
|
|
BKN
|
Broken
|
BLSN
|
Blowing snow
|
|
BLDG
|
Building
|
|
|
C
|
|
C
|
Degree Celsius (Centigrade)
|
CMB
|
Climb to or climbing to
|
|
C2*
|
Command And Control
|
CMPL
|
Completion or complete
|
|
C/A Code*
|
Coarse/Acquisition Code
|
|
|
|
CAR*
|
Civil Aviation Requirements
|
CNL
|
Cancel or cancelled or flight plan cancellation (message type designator)
|
|
CAT
|
Category or clear air turbulence
|
CNS
|
Communication navigation and surveillance
|
|
CAVOK
|
Visibility, cloud and present weather better than prescribed value or conditions
|
COM
|
Communication
|
|
CB
|
Cumulonimbus
|
CM
|
Centimeter
|
|
|
|
CP*
|
Corrections Processor
|
|
CC
|
Cirrocumulus
|
CTR
|
Control Zone
|
|
CDN
|
Coordination (message type designator)
|
CTN
|
Caution
|
|
CDO
|
Continuous descent operations
|
CL
|
Centre line
|
|
CDR
|
Conditional Route
|
COND
|
Condition
|
|
CFM
|
Confirm or I confirm
|
CONS
|
Continuous
|
|
CFIT
|
Controlled Flight Into Terrain
|
CONST
|
Construction or constructed
|
|
CIDIN
|
Common ICAO data interchange network
|
CONT
|
Continue (s) or continued
|
|
CLD
|
Cloud
|
COORD
|
Co-ordinate or co-ordination
|
|
CLR
|
Clear(s) or cleared to or clearance
|
CRC*
|
Cyclic Redundancy Check
|
|
|
|
CVSS*
|
Correction and Verification Subsystem
|
|
CLSD
|
Close or closed or closing
|
CTA
|
Control Area
|
D
|
|
D***
|
Danger area (followed by identification)
|
DLY*
|
Daily
|
|
DA
|
Decision altitude
|
DME
|
Distance measuring equipment
|
|
DCD
|
Double channel duplex
|
DNG
|
Danger or dangerous
|
|
DCKG
|
Docking
|
DOC*
|
Document (S)
|
|
DCS
|
Double channel simplex
|
DPT
|
Depth
|
|
DCSS*
|
Data Communication Subsystem
|
|
|
|
DCT
|
Direct (in relation to flight plan clearance and type of approach)
|
DP
|
Dew point temperature
|
|
DEV
|
Deviation
|
DZ
|
Drizzle
|
|
DER*
|
Departure End of Runway
|
DSB
|
Double side band
|
|
DIV
|
Divert or Diverting
|
DTAM
|
Descend to and maintain
|
|
DEP
|
Depart or departure
|
DH
|
Decision height
|
|
DTRT
|
Deteriorate or deteriorating
|
DISP*
|
Displaced
|
|
DES
|
Descend to or descending to
|
DIST
|
Distance
|
|
DEST
|
Destination
|
DLA
|
Delay or delayed (message type designator)
|
|
DETRESFA
|
Distress phase
|
DW
|
Dual wheels
|
|
DFTI
|
Distance from touch down indicator
|
DUR
|
Duration
|
|
DGCA*
|
Director general of civil aviation
|
DVOR
|
Doppler VOR
|
E
|
|
EAT
|
Expected approach time
|
ESE
|
East south east
|
|
EB
|
East bound
|
EST
|
Estimate or estimated (message type designator)
|
|
EET
|
Estimated elapsed time
|
ETA
|
Estimated time of arrival or estimating arrival
|
|
EGNOS*
|
European Geostationary Navigation Overlay System
|
|
|
|
ELBA
|
Emergency location beacon aircraft
|
ETC*
|
Etceteras
|
|
ELECT
|
Electric, Electricity
|
ETD
|
Estimated time of departure or estimating departure
|
|
EN*
|
English
|
ETO
|
Estimated time over significant point
|
|
ENE
|
East north east
|
EV
|
Every
|
|
END
|
Stop-end (related to RVR)
|
EXC
|
Except
|
|
ENRT
|
En - route
|
EXER
|
Exercises or exercising or to exercise
|
|
EOBT
|
Estimated off block time
|
EXP
|
Except or excepted or expecting
|
|
EQPT
|
Equipment
|
EXTD
|
Extend or extending or extended
|
|
ERC*
|
En-route chart
|
|
|
F
|
|
F
|
Fixed
|
FLUC
|
Fluctuating or fluctuated or fluctuation
|
|
FAA*
|
Federal Aviation Administration
|
FLW
|
Follow (s) or following
|
|
FAC
|
Facilities
|
FLY
|
Fly or flying
|
|
FAF
|
Final approach point
|
FM
|
From
|
|
FAL
|
Facilitation of international air transport
|
FMP*
|
Flow Management Position
|
|
FAP
|
Final approach point
|
FMU
|
Flow management unit
|
|
FAS*
|
Final Approach Segment
|
FMS*
|
Flight Management System
|
|
FATO
|
Final approach and take-off area
|
FNA
|
Final approach
|
|
FAX
|
Facsimile transmission
|
FOD
|
Foreign object damage
|
|
FCT
|
Friction coefficient
|
FPAP*
|
Flight Path Alignment Point
|
|
FCST
|
Forecast
|
FPL
|
Flight plan
|
|
FD
|
Fixed Distance
|
FPM
|
Feet per minute
|
|
FDE*
|
Fault Detection and Exclusion
|
FLW
|
Follow (s) or following
|
|
FEC*
|
Forward Error Correction
|
FREQ
|
Frequency
|
|
FG
|
Fog
|
FRNG
|
Firing
|
|
FIR
|
Flight information region
|
FRQ
|
Frequent
|
|
FIC
|
Flight information centre
|
FSD*
|
Full-scale Deflection
|
|
|
|
FSL
|
Full stop landing
|
|
FIS
|
Flight information service
|
FSS
|
Flight service station
|
|
|
|
FSP
|
Flight Service Predictor
|
|
FISA
|
Automated flight information service
|
FST
|
First
|
|
FL
|
Flight level
|
FT
|
Feet
|
|
FLG
|
Flashing
|
FTE*
|
Flight Technical Error
|
|
|
|
FTP*
|
Fictitious Threshold Point
|
|
FLR
|
Flares
|
FU
|
Smoke
|
|
FLT
|
Flight
|
FUA*
|
Flexible Use of Airspace
|
|
FLTCK
|
Flight check
|
FZ
|
Freezing
|
G
|
|
G
|
Green
|
GLONASS
|
Global Navigation Satellite System
|
|
G/A
|
Ground to air
|
GPS
|
Global Positioning System
|
|
G/A/G
|
Ground to air and air to ground
|
GPS SP
|
GPS - Standard Positioning Service
|
|
GAGAN*
|
GPS Aided GEO Augmented Navigation
|
GR
|
Group
|
|
GARP*
|
GBAS Azimuth Reference Point
|
GRASS
|
Grass landing area
|
|
GBAS*
|
Ground-Based Augmentation System
|
GS
|
Ground speed
|
|
GCA
|
Ground control approach system or ground control approach
|
GND
|
Ground
|
|
GEN
|
General
|
GNDCK
|
Ground check
|
|
GEO
|
Geographic
|
GNSS
|
Global navigation satellite system
|
|
GEO*
|
Geostationary Satellite
|
GP
|
Glide path
|
|
GES
|
Ground earth station
|
GPA
|
Glide Path Angle
|
|
GLD
|
Glider
|
GPIP*
|
Glide Path Intercept Point
|
H
|
|
H+*
|
Hours plus ...minutes past the hour
|
HOL
|
Holiday
|
|
H24
|
Continuos day and night service
|
HLDG
|
Holding
|
|
HAL*
|
Hindustan Aeronautics Ltd.
|
HMI*
|
Hazardously Misleading Information
|
|
HBN
|
Hazard beacon
|
HN
|
Sunset to sunrise
|
|
HDF
|
High frequency direction finding station
|
HO
|
Service available to meet operational requirements
|
|
HDG
|
Heading
|
HOSP
|
Hospital aircraft
|
|
HEL
|
Helicopter
|
HPA
|
Hectopascal
|
|
|
|
HPL*
|
Horizontal Protection Level
|
|
HEL-L*
|
Light helicopter (radius of action of 50NM and capacity for evacuating one person)
|
HQ*
|
Headquarters
|
|
HEL-M*
|
Medium helicopter (radius of action of 50 to 100NM and capacity for evacuating 2-5 persons)
|
HR
|
Hours
|
|
HEL-H*
|
Heavy helicopter (radius of action in excess of 100 NM and capacity for evacuating more than 5 persons)
|
HS
|
Service available during hours of Scheduled operations
|
|
HF
|
High frequency (3000 to 30000 khz)
|
HX
|
No specific working hours
|
|
HGT
|
Height or height above
|
HZ
|
Dust haze
|
|
HJ
|
Sunrise to sunset
|
HZ
|
Hertz (cycle per second )
|
I
|
|
IAC
|
Instrument approach chart
|
IMPR
|
Improve or improving
|
|
IAF
|
Initial approach fix
|
IMT
|
Immediate or immediately
|
|
IAP
|
Instrument Approach Procedure
|
IGP
|
Ionospheric Grid Points
|
|
IAR
|
Intersection of air routes
|
INA
|
Initial approach
|
|
IAS
|
Indicated air speed
|
INBD
|
Inbound
|
|
IBN
|
Identification beacon
|
INMCC*
|
Indian Master Control Centre
|
|
ICAO
|
International Civil Aviation Organization
|
INREC*
|
Indian Reference Stations
|
|
ID
|
Identifier or identify
|
INREE*
|
INRES Equipment (Indian Reference Equipment)
|
|
|
|
INRES
|
Indian Reference Stations
|
|
IDENT
|
Identification
|
INSTL
|
Install or installed or installation
|
|
IF
|
Intermediate approach fix
|
INSTR
|
Instrument
|
|
IFR
|
Instrument flight rules
|
INT
|
Intersection
|
|
IGA
|
International general aviation
|
INTL
|
International
|
|
ILS
|
Instrument landing system
|
INTRG
|
Interrogator
|
|
IM
|
Inner marker
|
INTRP
|
Interrupt or interruption or interrupted
|
|
IMC
|
Instrument meteorological conditions
|
INTSF
|
Intensify or intensifying
|
|
IMG
|
Immigration
|
INTST
|
Intensity
|
|
ILS
|
Instrument landing system
|
ISA
|
International standard atmosphere
|
|
INLUS*
|
Indian Land Uplink Stations
|
ISB
|
Independent sideband
|
|
NLUS-RFU*
|
INLUS - Radio Frequency Unit
|
ISOL
|
Isolated
|
|
INLUS-SGS*
|
INLUS - Signal Generation Subsystem
|
ISRO*
|
Indian Space Research Organisation
|
J
|
|
JAN
|
January
|
|
|
|
JUL
|
July
|
|
|
|
JUN
|
June
|
|
|
K
|
|
KG
|
Kilograms
|
KRA
|
Kilopascal
|
|
KHZ
|
Kiloherz
|
KT
|
Knots
|
|
KM
|
Kilometres
|
KW
|
Kilowatt
|
|
KMH
|
Kilometres per hour
|
|
|
L
|
|
......L
|
Left (preceded by runway designation number to identify a parallel runway)
|
LOC
|
Localizer
|
|
L
|
Locator (see LM, LO)
|
LONG
|
Longitude
|
|
L1 Frequency*
|
1575.42MHz
|
|
|
|
LAT
|
Latitude
|
LORAN
|
LORAN(Long range navigation system)
|
|
LDA
|
Landing distance available
|
LRG
|
Long range
|
|
LDG
|
Landing
|
LM
|
Locator middle
|
|
|
|
LNAV*
|
Lateral Navigation
|
|
LDI
|
Landing direction indicator
|
LNG
|
Long (used to indicate the type of approach desired or required)
|
|
LEN
|
Length
|
LO
|
Locator , outer
|
|
|
|
LPV*
|
Localizer Performance with Vertical Guidance
|
|
LF
|
Low frequency (30 to 300 khz)
|
LSQ
|
Line squall
|
|
LGT
|
Light
|
LT*
|
Local time
|
|
LGTD
|
Lighted
|
LTA
|
Lower control area
|
|
LIH
|
Light intensity high
|
LTD
|
Limited
|
|
|
|
LTP*
|
Landing Threshold Point
|
|
LIL
|
Light intensity low
|
LV
|
Light and variable(relating to wind)
|
|
LIM
|
Light intensity medium
|
LVL
|
Level
|
|
LLZ
|
Lacalizer
|
LYR
|
Layer or layered
|
M
|
|
M
|
Mach number (followed by figures) or Metres (preceded by figures )
|
MLS
|
Microwave landing system
|
|
MAG
|
Magnetic
|
MM
|
Middle marker
|
|
MAINT
|
Maintenance
|
MNM
|
Minimum
|
|
MAP
|
Aeronautical maps and charts
|
MNPS
|
Minimum navigation performance specification
|
|
MAPT
|
Missed approach point
|
MNT
|
Monitor or monitoring or monitored
|
|
MAR
|
March
|
MNTN
|
Maintain
|
|
MAWP*
|
Missed Approach Way Point
|
|
|
|
MAX
|
Maximum
|
MOA
|
Military operating area
|
|
MAY
|
May
|
MOB
|
Mobile
|
|
MCA
|
Minimum crossing altitude
|
MOC
|
Minimum obstacle clearance (required)
|
|
MCW
|
Modulated continuous wave
|
MOD*
|
Ministry of Defence
|
|
MDA
|
Minimum descent altitude
|
MOEFCC*
|
Ministry Of Environment, Forest And Climate Change
|
|
MDH
|
Minimum descent height
|
MRA
|
Minimum reception altitude
|
|
MEA
|
Minimum en-route altitude
|
MRG
|
Medium range
|
|
MEHT
|
Minimum eye height threshold(for visual approach slope indicator system
|
MRP
|
ATS/MET reporting point
|
|
MET
|
Meteorology or meteorological
|
MS
|
Minus
|
|
METAR
|
Aviation routine weather report (in aeronautical code)
|
MSA
|
Minimum sector altitude
|
|
|
|
MSAS*
|
Multifunctional Transport Satellite (MTSAT) Satellite-based Augmentation System
|
|
|
|
MSAW
|
Minimum Safe Altitude Warning
|
|
MHA*
|
Ministry Of Home Affairs
|
MSG
|
Message
|
|
MHZ
|
Megahertz
|
MSL
|
Mean sea level
|
|
MIL
|
Military
|
MTU
|
Metric units
|
|
MIFG
|
Shallow fog
|
MWO
|
Meteorological watch office
|
|
MKR
|
Marker radio beacon
|
|
|
N
|
|
N
|
North or northern latitude
|
NNE
|
North North East
|
|
NAMAC*
|
National Airspace Management Advisory Committee
|
NNW
|
North North West
|
|
NAMC*
|
National Airspace Management Cell
|
NOF
|
International NOTAM office
|
|
NAV
|
Navigation
|
NOSIG
|
No significant change (used in trend type landing forecasts )
|
|
NC
|
No change
|
NOTAM
|
Notice to Airmen
|
|
NDB
|
Non directional radio beacon
|
NOV
|
November
|
|
|
|
NPA*
|
Non-Precision Approach
|
|
NDZ*
|
No Drone Zone
|
NPNT*
|
No Permission-no Takeoff
|
|
NE
|
North east
|
NR
|
Number
|
|
NGT
|
Night
|
NS
|
Nimbostratus
|
|
NHLAPB*
|
National High Level Airspace Policy Body
|
NTRO*
|
National Technical Research Organisation
|
|
NIL
|
None or I have nothing to send to you
|
NW
|
North west
|
|
NM
|
Nautical mile
|
NXT
|
Next
|
|
NML
|
Normal
|
|
|
O
|
|
OAC
|
Oceanic area control centre
|
OFZ
|
Obstacle Free Zone
|
|
OAS
|
Obstacle assessment surface
|
OLS*
|
Obstacle Limitation Surface
|
|
OBS
|
Observe or observed or observation
|
OM
|
Outer marker
|
|
|
|
OMSS*
|
Operation & Maintenance Subsystem
|
|
OBST
|
Obstacle
|
OPMET
|
Operational meteorological (information)
|
|
OBSTR*
|
Obstruction
|
OPN
|
Open or opened or opening
|
|
OCA
|
Oceanic control area or obstacle clearance altitude
|
OPR
|
Operator or operate or operative or operating or operational
|
|
OCA/H
|
Obstacle Clearance Altitude/Height
|
|
|
|
OCC
|
Occulting light
|
OPS
|
Operations
|
|
OCH
|
Obstacle clearance height
|
O/R
|
On request
|
|
OCNL
|
Occasional or occasionally
|
OTP
|
On top
|
|
OCS
|
Obstacle clearance surface
|
OTS
|
Organised track system
|
|
OCT
|
October
|
OUBD
|
Out of bound
|
P
|
|
P...
|
Prohibited area (followed by identification)
|
POSS
|
Possible
|
|
PA*
|
Precision Approach
|
PBB
|
Passenger boarding bridge
|
|
PALS
|
Precision approach lighting system
|
PPI
|
Plan position indicator
|
|
PANS
|
Procedures for air navigation services
|
PPR
|
Prior permission required
|
|
PBN
|
Performance-Based Navigation
|
PRN*
|
Pseudo-Random Noise
|
|
PAPI
|
Precision approach path indicator
|
PRI
|
Primary
|
|
PAR
|
Precision approach radar
|
PRKG
|
Parking
|
|
PARL
|
Parallel
|
PROB
|
Probability
|
|
PAX
|
Passenger (s)
|
PROC
|
Procedure
|
|
PCN
|
Pavement classification number
|
PROV
|
Provisional
|
|
PER
|
Performance
|
PS
|
Plus
|
|
PERM
|
Permanent
|
PSN
|
Position
|
|
PIB*
|
Pre-flight information bulletin
|
PSP
|
Pierced steel plank
|
|
PJE
|
Parachute jumping exercise
|
PSTN
|
Public Switched Telephone Network
|
|
PLA
|
Practice low approach
|
PSR*
|
Primary surveillance radar
|
|
PLN
|
Flight plan
|
PT*
|
Point (s)
|
|
PN
|
Prior notice required
|
PTN
|
Procedure turn
|
|
PNR
|
Point of no return
|
PVT*
|
Private
|
|
POB
|
Persons on board
|
PWR
|
Power
|
Q
|
|
QBI
|
Compulsory IFR flight
|
QNH
|
Altimeter sub-scale setting to obtain Elevation when on ground
|
|
QBM
|
Magnetic heading (zero wind)
|
QTE
|
True bearing
|
|
QDR
|
Magnetic bearing
|
QUAD
|
Quadrant
|
|
QFE
|
Atmospheric pressure at aerodrome elevation (or at runway threshold)
|
|
|
|
QFU
|
Magnetic orientation of runway
|
|
|
R
|
|
R
|
Red
|
RNP
|
Required navigation performance
|
|
R...
|
Restricted area (followed by identification)
|
ROC
|
Rate of climb
|
|
R
|
Runway (runway identification)
|
ROD
|
Rate of descent
|
|
RAC
|
Rules of the air and air traffic services
|
ROFOR
|
Route forecast ( in aeronautical met. code)
|
|
RAD*
|
Radius
|
RON
|
Receiving only
|
|
RAG
|
Runway arresting gear
|
RPL
|
Repetitive flight plan
|
|
RAI
|
Runway alignment indicator
|
RPLC
|
Replace or replaced
|
|
RAMC*
|
Regional Airspace Management Cell
|
RNAV
|
Area Navigation
|
|
RASH
|
Rain showers
|
RNP
|
Required Navigation Performance
|
|
RCA
|
Reach cruising altitude
|
RPS
|
Radar position symbol
|
|
RCC
|
Rescue coordination centre
|
RPT
|
Repeat
|
|
RCF
|
Radio communication failure (message type designator)
|
RQP
|
Request flight plan (message type designator)
|
|
RCL
|
Runway center line
|
RQS
|
Request supplementary flight plan (message type designator)
|
|
RCLL
|
Runway center line light (s)
|
RR
|
Report reaching
|
|
RDH
|
Reference datum height (for ILS)
|
RSC
|
Rescue sub-centre
|
|
RDL
|
Radial
|
RSCD
|
Runway surface condition
|
|
RDO
|
Radio
|
RSP
|
Responder beacon
|
|
RD
|
Road
|
RSR
|
En-route surveillance radar
|
|
REC
|
Receive or receiver
|
RTE
|
Route
|
|
REDL
|
Runway edge light (s)
|
RTF
|
Radio telephone
|
|
REF
|
Reference to... or refer to...
|
RTG
|
Radio telegraph
|
|
REG
|
Registration
|
RDHL
|
Runway threshold light (s)
|
|
RENL
|
Runway end light (s)
|
RTN
|
Return or returned or returning
|
|
REP
|
Report or reporting or reporting point
|
RQMNTS
|
Requirements
|
|
REQ
|
Request or requested
|
RTS
|
Return to service
|
|
RERTE
|
Re-route
|
RTT
|
Radio teletypewriter
|
|
RES*
|
Reservation
|
RIZL
|
Runway touch down zone light (s)
|
|
RESA
|
Runway End Safety Area
|
RMK
|
Remark
|
|
RFC*
|
Radio facility chart
|
RNAV
|
Area navigation (to be pronounced "ARNAV"
|
|
RFID*
|
Radio Frequency Identification
|
RPA*
|
Remotely Piloted Aircraft
|
|
RG
|
Range
|
RPAS
|
Remotely Piloted Aircraft System
|
|
RH*
|
Rescue helicopter
|
RR
|
Report reaching
|
|
RFI*
|
Reference path Identifier
|
RTCA*
|
Radio Technical Commission for Aeronautics
|
|
RIF
|
Re-clearance in flight
|
RUT
|
Standard regional route transmitting freq.
|
|
RITE
|
Right (direction of turn)
|
RV
|
Rescue vessel
|
|
RLLS
|
Runway lead in lighting system
|
RVR
|
Runway visual range
|
|
RLOS*
|
Radio Line Of Sight
|
RWY
|
Runway
|
S
|
|
S
|
South or southern latitude
|
SPL
|
Supplementary flight plan (message type designator )
|
|
SALS
|
Simple approach lighting system
|
SPOT
|
Spot wind
|
|
SAN
|
Sanitary
|
SQ
|
Squall
|
|
SAR
|
Search and rescue
|
SR
|
Sunrise
|
|
SARPS
|
Standards and recommended practices
|
SRA
|
Surveillance radar approach
|
|
SAT
|
Saturday
|
SRE
|
Surveillance radar element of precision approach radar system
|
|
SATCOM
|
Satellite communication
|
SRG
|
Short range
|
|
SB
|
South bound
|
SRR
|
Search and rescue region
|
|
SBAS*
|
Satellite-Based Augmentation System
|
|
|
|
SC
|
Stratocumulus
|
SRY
|
Secondary
|
|
SCT
|
Scattered
|
SS
|
Sunset
|
|
SDBY
|
Stand by
|
SSB
|
Single sideband
|
|
SE
|
South east
|
SSE
|
South south east
|
|
SEC
|
Seconds
|
SSR
|
Secondary surveillance radar
|
|
SECT
|
Sector
|
SST
|
Supersonic transport
|
|
SELCAL
|
Selective calling system
|
SSW
|
South south west
|
|
SEP
|
September
|
ST
|
Stratus
|
|
SER
|
Service or servicing or served
|
STA
|
Straight in approach
|
|
SEV
|
Severe
|
STAR
|
Standard instrument arrival
|
|
SFC
|
Surface
|
STD
|
Standard
|
|
SGL
|
Signal
|
STF
|
Stratiform
|
|
SID
|
Standard instrument departure
|
STN
|
Station
|
|
SIF
|
Selective identification feature
|
STNR
|
Stationary
|
|
SIGMET
|
Information concerning en-route weather phenomena which may affect the safety of aircraft ops.
|
STOL
|
Short take-off and landing
|
|
SIGWX
|
Significant weather
|
STWL
|
Stop way light (s)
|
|
SIM*
|
Subscriber Identity Module
|
SUA*
|
Special Use Airspace
|
|
SIMUL
|
Simultaneous or simultaneously
|
SUBJ
|
subject to
|
|
SIS
|
Signal In Space
|
SUN
|
Sunday
|
|
SMC
|
Surface movement control
|
SUP
|
Supplement (AIP Supplement )
|
|
SMSS*
|
Service Monitoring Subsystem
|
|
|
|
SMR
|
Surface movement radar
|
SUPPS
|
Regional supplementary procedures
|
|
SOP*
|
Standard Operating Procedure
|
SVC
|
Service message
|
|
SP*
|
Safety Processor
|
SPS*
|
Standard Positioning Service
|
|
SPECI
|
Aviation selected special weather report (in aeronautical meteorological code )
|
SVCBL
|
Serviceable
|
|
SPECIAL
|
Special meteorological report (in abbreviated plain language )
|
SW
|
South west
|
T
|
|
T
|
Temperature
|
TLOF
|
Touch down and lift-off area
|
|
TA
|
Transition altitude
|
TMA
|
Terminal control area
|
|
TACAN
|
UHF tactical air navigation aid
|
TOC
|
Top climb TODA
|
|
TAF
|
Aerodrome forecast
|
TODA
|
Take-off distance available
|
|
TAIL
|
Tail wind
|
TOP
|
Cloud top
|
|
TAR
|
Terminal area surveillance radar
|
TP*
|
Turning Point
|
|
TAS
|
True air speed
|
TRA*
|
Temporary reserved area
|
|
TAX
|
Taxing or taxi
|
TRNG*
|
Training
|
|
TBO*
|
Trajectory Based Operations
|
TRANS
|
Transmit or transmitter
|
|
TCH*
|
Threshold Crossing Height
|
|
|
|
TCU
|
Towering cumulus
|
TRL
|
Transition level
|
|
TDZ
|
Touch down zone
|
TS
|
Thunderstorm
|
|
|
|
TSA*
|
Temporary Segregated Area
|
|
|
|
TSO*
|
Technical Standard Order
|
|
TECR
|
Technical reason
|
TT
|
Teletypewriter
|
|
TEL
|
Telephone
|
TUE
|
Tuesday
|
|
TEMPO
|
Temporary or temporarily
|
TURB
|
Turbulence
|
|
TF*
|
Track to Fix
|
|
|
|
TFC
|
Traffic
|
TVOR
|
Terminal VOR
|
|
TGL
|
Touch and go landing
|
TWR
|
Aerodrome control tower or aerodrome control
|
|
TGS
|
Taxing guidance system
|
TWY
|
Taxi
|
|
THR
|
Threshold
|
TWYL
|
Taxiway link
|
|
THRU
|
Through
|
TYP
|
Type of aircraft
|
|
THU
|
Thursday
|
TYPH
|
Typhoon
|
|
TIL
|
Until
|
|
|
|
TKOF
|
Take-off
|
|
|
U
|
|
UA
|
Unmanned Aircraft
|
UIN*
|
Unique Identification Number
|
|
UAB
|
Until advised by.........
|
UIR
|
Upper flight information region
|
|
UAC
|
Upper area control centre
|
ULR
|
Ultra long range
|
|
UAOP*
|
Unmanned Aircraft Operator Permit
|
UNA
|
Unable
|
|
UAR
|
Upper air route
|
UNL
|
Unlimited
|
|
UAS*
|
Unmanned Aircraft System
|
UNREL
|
Unreliable
|
|
UFN
|
Until further notice
|
U/S
|
Unserviceable
|
|
UHF
|
Ultra high frequency (300 to 3000 mhz )
|
UTA
|
Upper control area
|
|
UIC
|
Upper information centre
|
UTC
|
Coordinated universal time
|
|
|
|
UUP*
|
Updated Airspace Use Plan
|
V
|
|
VA
|
Volcanic ash
|
VLOS*
|
Visual Line-of-sight
|
|
VAC
|
Visual approach chart
|
VLR
|
Very long range
|
|
VAL*
|
Vertical Alarm Limit
|
|
|
|
VAR
|
Visual aural radio range /magnetic variation
|
VMC
|
Visual meteorological conditions
|
|
|
|
VNAV*
|
Vertical Navigation
|
|
VASIS
|
Visual approach slope indicator system
|
VOLMET
|
Met. information for aircraft in flight
|
|
VCY
|
Vicinity
|
VOR
|
VHF omni directional radio range
|
|
VDF
|
Very high frequency direction finding station
|
VORTAC
|
VOR and TACAN combination
|
|
VER
|
Vertical
|
VOT
|
VOR airborne equipment test facility
|
|
|
|
VPA*
|
Vertical Path Angle
|
|
|
|
VPL*
|
Vertical Protection Level
|
|
VFR
|
Visual flight rules
|
VRB
|
Variable
|
|
VHF
|
Very high frequency (30 to 300 mhz )
|
VSA
|
By visual reference to the ground
|
|
VIP
|
Very important person
|
VSP
|
Vertical speed
|
|
|
|
VTF*
|
Vector to Final
|
|
VIS
|
Visibility
|
VTOL
|
Vertical take-off and landing
|
|
VLF
|
Very low frequency (3 to 30 khz )
|
VVIP*
|
Very very important person
|
W
|
|
W & G
|
White & Green
|
WILCO
|
Will comply
|
|
W
|
West or western latitude or white
|
WIP
|
Work in progress
|
|
WAAS*
|
Wide Area Augmentation System
|
|
|
|
WAC
|
World Aeronautical chart ICAO 1:1000000
|
WKN
|
Weaken or weakening
|
|
WBAR
|
Wing bar lights
|
WNW
|
West north west
|
|
WDI
|
Wind direction indicator
|
WPT
|
Way point
|
|
WDSPR
|
Widespread
|
WRNG
|
Warning
|
|
WED
|
Wednesday
|
WS
|
Wind shear
|
|
WEF
|
With effect from or effective from
|
WSW
|
West south west
|
|
WGS*
|
World Geodetic System
|
|
|
|
WI
|
With in
|
W/S
|
Wingspan
|
|
WID
|
Width
|
WT
|
Weight
|
|
WIE
|
With immediate effect or effective immediately
|
WTSPT
|
Waterspout
|
|
|
|
WX
|
Weather
|
X
|
|
X
|
Cross
|
|
|
|
XBAR
|
Cross bar (of approach lighting system )
|
|
|
|
XNG
|
Crossing
|
|
|
|
XS
|
Atmospherics
|
|
|
Y
|
|
Y
|
Yellow
|
|
|
|
YCZ
|
Yellow caution zone (runway lighting )
|
|
|
|
YR
|
Yours
|
|
|