|
Contraction
|
Definition
|
Usage
|
|
R
|
Acknowledgement of receipt (message handling)
|
GEN
|
|
R
|
Received (acknowledgement of receipt)
|
ICAO
|
|
R
|
restricted area (followed by identification)
|
ICAO
|
|
R
|
right (runway identification)
|
ICAO
|
|
R
|
runway (used in RVR measurement)
|
METAR
|
|
R/O
|
receive only
|
GEN
|
|
R/OC
|
receive, only centers
|
GEN
|
|
RA
|
rain
|
METAR
|
|
RAAF
|
Royal Australian Air Force
|
GEN
|
|
RABA
|
no RAWIN obs., no balloons available
|
NWS
|
|
RABAL
|
radiosonde balloon wind data
|
NWS
|
|
RABAR
|
radiosonde balloon release
|
NWS
|
|
RAC
|
request altitude change
|
ATC
|
|
RAC
|
rules of the air and air traffic services
|
ICAO
|
|
RACE
|
request altitude changes en route
|
ATC
|
|
RACFI
|
radio and communication facilities inoperative
|
GEN
|
|
RACO
|
no RAWIN obs., communications out
|
NWS
|
|
RACON
|
radar responder beacon
|
GEN
|
|
RADAT
|
radiosonde observation data
|
NWS
|
|
RADEP
|
radar departure
|
ATC
|
|
RADNO
|
report missing account radio failure
|
NWS
|
|
RADON
|
radar beacon
|
GEN
|
|
RADU
|
weather radar analysis and development unit
|
GEN
|
|
RAF
|
Royal Air Force
|
GEN
|
|
RAFC
|
regional area forecast center
|
ICAO
|
|
RAFI
|
radiosonde observation not filed
|
NWS
|
|
RAFRZ
|
radiosonde observation freezing levels
|
NWS
|
|
RAG
|
ragged
|
ICAO
|
|
RAG
|
runway arresting gear
|
ICAO
|
|
RAGF
|
remote air-ground facility
|
GEN
|
|
RAHE
|
no RAWIN obs., no gas available
|
NWS
|
|
RAI
|
runway alignment indicator
|
ICAO
|
|
RAICG
|
radiosonde observation icing at
|
NWS
|
|
RAIL
|
runway alignment indicator lights
|
GEN
|
|
RAIM
|
Receiver Autonomous Integrity Monitoring
|
ATC
|
|
RAIM
|
Receiver autonomous integrity monitoring
|
ICAO
|
|
RAJAM
|
radar jamming
|
ATC
|
|
RALT
|
regardless of altitude
|
ATC
|
|
RAM
|
returned account mechanical
|
GEN
|
|
RAOB
|
radiosonde observation
|
NWS
|
|
RAPCON
|
radar approach control
|
GEN
|
|
RAPI
|
radiosonde report already sent in PIBAL collection
|
GEN
|
|
RARAD
|
radar advisory
|
GEN
|
|
RAREP
|
radar weather report
|
NWS
|
|
RASC
|
Regional AIS system centre
|
ICAO
|
|
RASH
|
rain showers
|
ICAO
|
|
RASN
|
rain and snow or showers of rain and snow
|
METAR
|
|
RATCF
|
radar ATC facility (USN)
|
GEN
|
|
RAVU
|
radiosonde analysis and verification unit
|
NWS
|
|
RAWE
|
no RAWIN obs., unfavorable weather
|
NWS
|
|
RAWI
|
no RAWIN obs., high and gusty winds
|
NWS
|
|
RAWIN
|
upper winds obs. (by radio methods)
|
NWS
|
|
RAWX
|
returned account weather
|
GEN
|
|
RB
|
rescue boat
|
ICAO
|
|
RB
|
right base
|
ATC
|
|
RBDE
|
radar bright display equipment
|
GEN
|
|
RBN
|
radio beacon
|
GEN
|
|
RBOC
|
report back on course
|
ATC
|
|
RBOF
|
report back on frequency
|
ATC
|
|
RBS
|
radar bomb scoring
|
GEN
|
|
RBS PP (RBS++)
|
ration by schedule plus compression
|
ATC
|
|
RC
|
reverse course
|
ATC
|
|
RC
|
road reconnaissance
|
GEN
|
|
RCA
|
reach cruising altitude
|
ICAO
|
|
RCADV
|
reverse course and advise
|
ATC
|
|
RCAG
|
remote communications air/ground facility
|
GEN
|
|
RCALT
|
reach cruising altitude
|
ATC
|
|
RCC
|
Rescue Coordination Center
|
GEN
|
|
RCD
|
radar cloud detection report
|
NWS
|
|
RCDNA
|
radar cloud detection report not available
|
NWS
|
|
RCDNE
|
radar cloud detection report no echoes observed
|
NWS
|
|
RCDNO
|
radar cloud detector inoperative due to breakdown until
|
NWS
|
|
RCDOM
|
radar cloud detector inoperative due to maintenance until
|
NWS
|
|
RCF
|
radio communication failure
|
ICAO
|
|
RCF
|
radiocommunication failure
|
ICAO
|
|
RCF
|
remain on company frequency
|
ATC
|
|
RCH
|
reach
|
GEN
|
|
RCH
|
reach - call sign for U.S. AirForce, Air Mobility Command (USAFAMC)
|
MIL
|
|
RCK
|
radio check
|
ATC
|
|
RCKY
|
Rockies (mountains)
|
NWS
|
|
RCL
|
runway center line
|
ICAO
|
|
RCLL
|
runway center line lights
|
ICAO
|
|
RCLM
|
runway centerline marking
|
GEN
|
|
RCLR
|
radio communications link repeater
|
GEN
|
|
RCLS
|
runway centerline light system
|
GEN
|
|
RCLT
|
radio communications link terminal
|
GEN
|
|
RCMD
|
recommend
|
GEN
|
|
RCN
|
Royal Canadian Navy
|
GEN
|
|
RCO
|
remote communication outlet
|
GEN
|
|
RCOM
|
en route communications
|
GEN
|
|
RCON
|
reconfiguration
|
ATC
|
|
RCPT
|
receipt
|
GEN
|
|
RCR
|
runway condition reading
|
GEN
|
|
RCRD
|
record
|
GEN
|
|
RCS
|
Rehost Computer System
|
ATC
|
|
RCV
|
receive
|
GEN
|
|
RCVNO
|
receiving capability out
|
GEN
|
|
RDARA
|
regional and domestic air route area
|
GEN
|
|
RDAT
|
radar data (digitized)
|
GEN
|
|
RDC
|
reduce
|
GEN
|
|
RDG
|
ridge
|
NWS
|
|
RDH
|
reference datum height (ILS)
|
ICAO
|
|
RDL
|
radial
|
ICAO
|
|
RDO
|
radio
|
ICAO
|
|
RDS
|
radius
|
GEN
|
|
RDSP
|
redispatch
|
GEN
|
|
RDSPA
|
redispatch accepted
|
GEN
|
|
RDWND
|
radar dome wind
|
NWS
|
|
RE
|
regard
|
GEN
|
|
REBAT
|
reference BATCS report
|
GEN
|
|
REC
|
receive
|
ICAO
|
|
RECLR
|
recleared
|
ICAO
|
|
RECON
|
reconnaissance
|
GEN
|
|
RECON
|
reference conversation
|
GEN
|
|
REDL
|
runway edge light
|
ICAO
|
|
REF
|
reference
|
GEN
|
|
REFONE
|
reference our telephone conversation
|
GEN
|
|
REFORM
|
reference form
|
GEN
|
|
REG
|
registration
|
ICAO
|
|
REG
|
regulation
|
GEN
|
|
REGAL
|
range and elevation guidance for approach and landing
|
ATC
|
|
REIB
|
report established in block
|
ATC
|
|
REIL
|
runway end identifier lights
|
GEN
|
|
REINV
|
reference invoice
|
GEN
|
|
RELBL
|
reliable
|
GEN
|
|
RELCT
|
relocate
|
GEN
|
|
RELET
|
reference letter
|
GEN
|
|
REMES
|
reference message
|
GEN
|
|
REMT
|
relief electronic maintenance technician
|
GEN
|
|
RENL
|
runway end light
|
ICAO
|
|
RENOT
|
regional office notice
|
GEN
|
|
REOC
|
report when established on course
|
ATC
|
|
REP
|
report or reporting point
|
ICAO
|
|
REP
|
represent or representative
|
GEN
|
|
REP
|
research project
|
GEN
|
|
REPAML
|
reply by airmail
|
GEN
|
|
REPBS
|
reference PBS message
|
GEN
|
|
REPERF
|
reperforator
|
GEN
|
|
REPMES
|
reply by message
|
GEN
|
|
REPML
|
reply by mail
|
GEN
|
|
REPTWX
|
reply by TWX
|
GEN
|
|
REQ
|
request
|
GEN
|
|
REQID
|
request if desired
|
GEN
|
|
REQON
|
request consideration
|
GEN
|
|
REQRCM
|
request your recommendation
|
GEN
|
|
REQSTD
|
requested
|
GEN
|
|
RERTE
|
reroute
|
ICAO
|
|
RES
|
reserve
|
GEN
|
|
RES
|
resident
|
GEN
|
|
RESA
|
Runway end safety area
|
ICAO
|
|
RESP
|
response
|
GEN
|
|
RESTR
|
restrict
|
NWS
|
|
REWRC
|
report when established well to right of course
|
ATC
|
|
RF
|
radio frequency
|
GEN
|
|
RF
|
reception fair (radio logs only)
|
ATC
|
|
RFA
|
request further airways
|
ATC
|
|
RFI
|
radio frequency interference
|
GEN
|
|
RFI
|
ready for issue
|
GEN
|
|
RFL
|
refuel
|
GEN
|
|
RFS
|
refuse
|
GEN
|
|
RFTO
|
ready for take-off
|
ATC
|
|
RG
|
range (lights)
|
ICAO
|
|
RG
|
reception good (radio logs only)
|
ATC
|
|
RGD
|
ragged
|
NWS
|
|
RGLR
|
regular
|
GEN
|
|
RGN
|
region
|
GEN
|
|
RH
|
relative humidity
|
NWS
|
|
RHC
|
Right-hand circuit
|
ICAO
|
|
RHI
|
range height indicator
|
GEN
|
|
RHINO
|
radar echo height information not available
|
NWS
|
|
RHINO
|
radar range height indicator not operating on scan
|
NWS
|
|
RIF
|
reclearance in flight
|
ICAO
|
|
RIF
|
reduction in force
|
GEN
|
|
RIMAT
|
must ride company material
|
GEN
|
|
RIOGD
|
Rio Grande
|
NWS
|
|
RIS
|
reports identification symbol
|
GEN
|
|
RITC
|
Request in Trail Climb
|
ATC
|
|
RITD
|
Request in Trail Descent
|
ATC
|
|
RITE
|
right (direction of turn)
|
ICAO
|
|
RL
|
report immediately upon leaving
|
ATC
|
|
RL
|
report leaving
|
ICAO
|
|
RLA
|
relay to
|
ICAO
|
|
RLANO
|
relay equipment out of operation
|
|