|
Definition
|
Contraction
|
Usage
|
|
radar advisory
|
RARAD
|
GEN
|
|
radar approach control
|
RAPCON
|
GEN
|
|
radar ATC facility (USN)
|
RATCF
|
GEN
|
|
radar beacon
|
RADON
|
GEN
|
|
radar bomb scoring
|
RBS
|
GEN
|
|
radar bright display equipment
|
RBDE
|
GEN
|
|
radar cloud detection report
|
RCD
|
NWS
|
|
radar cloud detection report no
echoes observed
|
RCDNE
|
NWS
|
|
radar cloud detection report not
available
|
RCDNA
|
NWS
|
|
radar cloud detector inoperative due
to breakdown until
|
RCDNO
|
NWS
|
|
radar cloud detector inoperative due
to maintenance until
|
RCDOM
|
NWS
|
|
radar data (digitized)
|
RDAT
|
GEN
|
|
radar departure
|
RADEP
|
ATC
|
|
radar dome wind
|
RDWND
|
NWS
|
|
radar echo height information not
available
|
RHINO
|
NWS
|
|
radar jamming
|
RAJAM
|
ATC
|
|
radar microwave link repeater
|
RMLR
|
GEN
|
|
radar microwave link terminal
|
RMLT
|
GEN
|
|
radar operating below prescribed
standard
|
ROBEPS
|
NWS
|
|
Radar position indicator
|
RPI
|
ICAO
|
|
radar position symbol
|
RPS
|
ICAO
|
|
radar range height indicator not
operating on scan
|
RHINO
|
NWS
|
|
radar range station
|
RR
|
GEN
|
|
radar responder beacon
|
RACON
|
GEN
|
|
radar track while scan
|
TWS
|
ATC
|
|
radar vector
|
RV
|
ATC
|
|
radar weather report
|
RAREP
|
NWS
|
|
radar weather report equipment
inoperative due to breakdown
|
PPINO
|
NWS
|
|
radar weather report equipment
inoperative due to maintenance
|
PPIOM
|
NWS
|
|
radar weather report equipment
operation resumed
|
PPIOK
|
NWS
|
|
radar weather report no echoes
observed
|
PPINE
|
NWS
|
|
radar weather report not available
(or omitted for a reason different
than those otherwise stated)
|
PPINA
|
NWS
|
|
radial
|
RDL
|
ICAO
|
|
radio
|
RDO
|
ICAO
|
|
radio and communication facilities
inoperative
|
RACFI
|
GEN
|
|
radio beacon
|
RBN
|
GEN
|
|
radio check
|
RCK
|
ATC
|
|
radio communication failure
|
RCF
|
ICAO
|
|
radio communications link repeater
|
RCLR
|
GEN
|
|
radio communications link terminal
|
RCLT
|
GEN
|
|
radio frequency
|
RF
|
GEN
|
|
radio frequency interference
|
RFI
|
GEN
|
|
radio range
|
RNG
|
ICAO
|
|
radiocommunication failure
|
RCF
|
ICAO
|
|
radiosonde analysis and verification
unit
|
RAVU
|
NWS
|
|
radiosonde balloon release
|
RABAR
|
NWS
|
|
radiosonde balloon wind data
|
RABAL
|
NWS
|
|
radiosonde observation
|
RAOB
|
NWS
|
|
radiosonde observation data
|
RADAT
|
NWS
|
|
radiosonde observation freezing
levels
|
RAFRZ
|
NWS
|
|
radiosonde observation icing at
|
RAICG
|
NWS
|
|
radiosonde observation not filed
|
RAFI
|
NWS
|
|
radiosonde report already sent in
PIBAL collection
|
RAPI
|
GEN
|
|
radiotelegraph
|
RTG
|
GEN
|
|
radiotelephone
|
RTF
|
GEN
|
|
radioteletypewriter
|
RTT
|
GEN
|
|
radius
|
RDS
|
GEN
|
|
ragged
|
RAG
|
ICAO
|
|
ragged
|
RGD
|
NWS
|
|
rain
|
RA
|
METAR
|
|
rain and snow or showers of rain and
snow
|
RASN
|
METAR
|
|
rain showers
|
RASH
|
ICAO
|
|
rain showers
|
SHRA
|
METAR
|
|
rainfall
|
RNFL
|
NWS
|
|
ramp check
|
RMPCK
|
ATC
|
|
range (lights)
|
RG
|
ICAO
|
|
range and elevation guidance for
approach and landing
|
REGAL
|
ATC
|
|
range height indicator
|
RHI
|
GEN
|
|
rapid
|
RPD
|
NWS
|
|
rate of climb
|
ROC
|
ICAO
|
|
rate of descent
|
ROD
|
ICAO
|
|
ration by schedule plus compression
|
RBS PP (RBS++)
|
ATC
|
|
reach
|
RCH
|
GEN
|
|
reach call sign for U.S. AirForce,
Air Mobility Command (USAFAMC)
|
RCH
|
MIL
|
|
reach cruising altitude
|
RCA
|
ICAO
|
|
reach cruising altitude
|
RCALT
|
ATC
|
|
ready for issue
|
RFI
|
GEN
|
|
ready for takeoff
|
RFTO
|
ATC
|
|
reason
|
RSN
|
GEN
|
|
receipt
|
RCPT
|
GEN
|
|
receive
|
RCV
|
GEN
|
|
receive or
receiver
|
REC
|
ICAO
|
|
receive only
|
R/O
|
GEN
|
|
receive, only centers
|
R/OC
|
GEN
|
|
Received (acknowledgement of
receipt)
|
R
|
ICAO
|
|
Receiver Autonomous Integrity
Monitoring
|
RAIM
|
ATC
|
|
Receiver autonomous integrity
monitoring
|
RAIM
|
ICAO
|
|
receiver station
|
RS
|
GEN
|
|
receiving capability out
|
RCVNO
|
GEN
|
|
reception fair (radio logs only)
|
RF
|
ATC
|
|
reception good (radio logs only)
|
RG
|
ATC
|
|
reception nil (radio logs only)
|
RN
|
ATC
|
|
reception poor (radio logs only)
|
RP
|
ATC
|
|
reclearance in flight
|
RIF
|
ICAO
|
|
recleared
|
RECLR
|
ICAO
|
|
recommend
|
RCMD
|
GEN
|
|
reconfiguration
|
RCON
|
ATC
|
|
reconnaissance
|
RECON
|
GEN
|
|
record
|
RCRD
|
GEN
|
|
record observation (weather reports
only)
|
SA
|
NWS
|
|
record special observation (weather
reports only)
|
RS
|
NWS
|
|
redispatch
|
RDSP
|
GEN
|
|
redispatch accepted
|
RDSPA
|
GEN
|
|
reduce
|
RDC
|
GEN
|
|
reduction in force
|
RIF
|
GEN
|
|
reference
|
REF
|
GEN
|
|
reference BATCS report
|
REBAT
|
GEN
|
|
reference conversation
|
RECON
|
GEN
|
|
reference datum height (ILS)
|
RDH
|
ICAO
|
|
reference form
|
REFORM
|
GEN
|
|
reference invoice
|
REINV
|
GEN
|
|
reference letter
|
RELET
|
GEN
|
|
reference letter from our office
|
ROLET
|
GEN
|
|
reference letter from your office
|
RULET
|
GEN
|
|
reference message
|
REMES
|
GEN
|
|
reference message from our office
|
ROMES
|
GEN
|
|
reference message from your office
|
RUMES
|
GEN
|
|
reference our memorandum
|
ROMEMO
|
GEN
|
|
reference our telephone conversation
|
REFONE
|
GEN
|
|
reference our TWX
|
ROTWX
|
GEN
|
|
reference PBS message
|
REPBS
|
GEN
|
|
reference PBS message from our
office
|
ROPBS
|
GEN
|
|
reference requisition from our
office
|
RORQN
|
GEN
|
|
reference requisition from your
office
|
RURQN
|
GEN
|
|
reference telegram from our office
|
ROTEL
|
GEN
|
|
reference telegram from your office
|
RUTEL
|
GEN
|
|
reference your form
|
RUFORM
|
GEN
|
|
reference your memorandum
|
RUMEMO
|
GEN
|
|
reference your TWX
|
RUTWX
|
GEN
|
|
refuel
|
RFL
|
GEN
|
|
refuse
|
RFS
|
GEN
|
|
regard
|
RE
|
GEN
|
|
regardless of altitude
|
RALT
|
ATC
|
|
regardless of destination airport
|
RODA
|
ATC
|
|
region
|
RGN
|
GEN
|
|
Regional AIS system centre
|
RASC
|
ICAO
|
|
regional and domestic air route area
|
RDARA
|
GEN
|
|
regional area forecast center
|
RAFC
|
ICAO
|
|
Regional Communications Control
Center
|
CCC
|
GEN
|
|
regional office
|
RO
|
GEN
|
|
regional office notice
|
RENOT
|
GEN
|
|
regional OPMET bulletin exchange
|
ROBEX
|
ICAO
|
|
regional supplementary procedures
|
SUPPS
|
ICAO
|
|
registration
|
REG
|
ICAO
|
|
regular
|
RGLR
|
GEN
|
|
regulated output
|
RO
|
GEN
|
|
regulation
|
REG
|
GEN
|
|
Rehost Computer System
|
RCS
|
ATC
|
|
relative
|
RLTV
|
GEN
|
|
relative bearing
|
RLBG
|
GEN
|
|
relative humidity
|
RH
|
NWS
|
|
relay equipment out of operation
|
RLANO
|
GEN
|
|
relay equipment resumed operation
|
RLAOK
|
GEN
|
|
relay station
|
RLSTN
|
GEN
|
|
relay to
|
RLA
|
ICAO
|
|
release
|
RLS
|
GEN
|
|
release subject your discretion
|
SYD
|
GEN
|
|
reliable
|
RELBL
|
GEN
|
|
relief electronic maintenance
technician
|
REMT
|
GEN
|
|
relieve
|
RLV
|
GEN
|
|
relocate
|
RELCT
|
GEN
|
|
remain
|
RMN
|
GEN
|
|
remain on company frequency
|
RCF
|
ATC
|
|
remain well to right of course
|
RWRC
|
ATC
|
|
remainder of same route
|
RRS
|
ATC
|
|
remaining overnight
|
RON
|
GEN
|
|
remark
|
RMK
|
ICAO
|
|
remark
|
RMRK
|
GEN
|
|
remarks (PIREP only)
|
RM
|
ATC
|
|
remote airground facility
|
RAGF
|
GEN
|
|
remote communication outlet
|
RCO
|
GEN
|
|
remote communications air/ground
facility
|
RCAG
|
GEN
|
|
remote receiver
|
RRCVR
|
GEN
|
|
remote transmitter
|
RTMTR
|
GEN
|
|
remote transmitter/receiver
|
RTR
|
ATC
|
|
repair
|
RPR
|
GEN
|
|
repeat
|
RPT
|
GEN
|
|
Repeat or I repeat
|
RPT
|
ICAO
|
|
reperforator
|
REPERF
|
GEN
|
|
repetitive flight plan
|
RPL
|
ICAO
|
|
replace
|
RPLC
|
GEN
|
|
reply by airmail
|
REPAML
|
GEN
|
|
reply by mail
|
REPML
|
GEN
|
|
reply by message
|
REPMES
|
GEN
|
|
reply by TWX
|
REPTWX
|
GEN
|
|
report
|
RPRT
|
GEN
|
|
report back on course
|
RBOC
|
ATC
|
|
report back on frequency
|
RBOF
|
ATC
|
|
report established in block
|
REIB
|
ATC
|
|
report immediately upon leaving
|
RL
|
ATC
|
|
report immediately upon reaching
|
RR
|
ATC
|
|
report landing completed
|
RLC
|
ATC
|
|
report leaving
|
RL
|
ICAO
|
|
report leaving each thousand foot
level
|
RLETFL
|
ATC
|
|
report level
|
RLVL
|
GEN
|
|
report missing account radio failure
|
RADNO
|
NWS
|
|
report or reporting point
|
REP
|
ICAO
|
|
report over
|
ROV
|
ATC
|
|
report passing
|
RPSG
|
ATC
|
|
report proceeding on course
|
RPOC
|
ATC
|
|
report reaching
|
RR
|
ICAO
|
|
report time crossing
|
RTX
|
ATC
|
|
report time over
|
RTO
|
ATC
|
|
report when established on course
|
REOC
|
ATC
|
|
report when established well to
right of course
|
REWRC
|
ATC
|
|
reported for duty
|
RPFOD
|
GEN
|
|
reports identification symbol
|
RIS
|
GEN
|
|
represent or representative
|
REP
|
GEN
|
|
request
|
REQ
|
GEN
|
|
request
|
RQ
|
GEN
|
|
request altitude change
|
RAC
|
ATC
|
|
request altitude changes en route
|
RACE
|
ATC
|
|
request clearance
|
RQCL
|
ATC
|
|
request clearance to depart VFR and
leave control zone at
|
RQDCZ
|
ATC
|
|
request clearance to enter control
zone VFR at
|
RQECZ
|
ATC
|
|
request consideration
|
REQON
|
GEN
|
|
request flight plan
|
RQP
|
ICAO
|
|
request further airways
|
RFA
|
ATC
|
|
request if desired
|
REQID
|
GEN
|
|
Request in Trail Climb
|
RITC
|
ATC
|
|
Request in Trail Descent
|
RITD
|
ATC
|
|
request level change en route
|
RLCE
|
ICAO
|
|
request level not available
|
RLNA
|
ICAO
|
|
request no SIDs or STARs
|
SSNO
|
ATC
|
|
request on file
|
RQOF
|
ATC
|
|
request permission
|
RQP
|
GEN
|
|
request present altitude
|
RPA
|
ATC
|
|
request present position
|
RQPP
|
ATC
|
|
request reply
|
RQRP
|
GEN
|
|
request supplementary flight plan
|
RQS
|
ICAO
|
|
request time and altitude over
|
RQTAO
|
ATC
|
|
request your recommendation
|
REQRCM
|
GEN
|
|
requested
|
REQSTD
|
GEN
|
|
require
|
RQR
|
GEN
|
|
required navigation performance
|
RNP
|
ICAO
|
|
requirements
|
RQMNTS
|
ICAO
|
|
requisition
|
RQN
|
GEN
|
|
reroute
|
RERTE
|
ICAO
|
|
reroute
|
RRTE
|
ATC
|
|
rescue
|
RSCU
|
GEN
|
|
rescue boat
|
RB
|
ICAO
|
|
Rescue Coordination Center
|
RCC
|
GEN
|
|
rescue subcenter
|
RSC
|
ICAO
|
|
rescue vessel
|
RV
|
ICAO
|
|
research project
|
REP
|
GEN
|
|
reservation
|
RSVN
|
GEN
|
|
reserve
|
RES
|
GEN
|
|
resident
|
RES
|
GEN
|
|
responder beacon
|
RSP
|
ICAO
|
|
response
|
RESP
|
GEN
|
|
rest of route unchanged
|
RORU
|
ATC
|
|
restrict
|
RESTR
|
NWS
|
|
restrict
|
RSTR
|
GEN
|
|
restricted area (followed by
identification)
|
R
|
ICAO
|
|
resume normal speed
|
RNLS
|
ATC
|
|
resumed operation
|
RSOPN
|
GEN
|
|
retained
|
RTND
|
GEN
|
|
retard
|
RTRD
|
GEN
|
|
return
|
RTN
|
ICAO
|
|
return
|
RTRN
|
GEN
|
|
return to base
|
RTB
|
ATC
|
|
return to service
|
RTS
|
GEN
|
|
returned account mechanical
|
RAM
|
GEN
|
|
returned account weather
|
RAWX
|
GEN
|
|
returning to ramp
|
RTR
|
ATC
|
|
reverse course
|
RC
|
ATC
|
|
reverse course and advise
|
RCADV
|
ATC
|
|
revise
|
RVS
|
GEN
|
|
rhumbline track
|
RLTK
|
ATC
|
|
ridge
|
RDG
|
NWS
|
|
right (direction of turn)
|
RITE
|
ICAO
|
|
right (runway identification)
|
R
|
ICAO
|
|
right base
|
RB
|
ATC
|
|
right side
|
RS
|
ATC
|
|
right traffic pattern
|
RP
|
ATC
|
|
right turn after takeoff
|
RT
|
ATC
|
|
Righthand circuit
|
RHC
|
ICAO
|
|
Rio Grande
|
RIOGD
|
NWS
|
|
rising
|
RSG
|
NWS
|
|
road reconnaissance
|
RC
|
GEN
|
|
Rockies (mountains)
|
RCKY
|
NWS
|
|
rotate
|
ROT
|
GEN
|
|
rotating
|
ROTG
|
GEN
|
|
rotation per minute
|
RPM
|
GEN
|
|
rough
|
RUF
|
NWS
|
|
round robin
|
RRBN
|
ATC
|
|
round trip
|
RT
|
GEN
|
|
route
|
RTE
|
GEN
|
|
route forecast
|
ROFOR
|
ICAO
|
|
routine
|
RTNE
|
GEN
|
|
routine PIREP
|
UA
|
ATC
|
|
Royal Air Force
|
RAF
|
GEN
|
|
Royal Australian Air Force
|
RAAF
|
GEN
|
|
Royal Canadian Navy
|
RCN
|
GEN
|
|
rules of the air and air traffic
services
|
RAC
|
ICAO
|
|
runway
|
RWY
|
ICAO
|
|
runway
|
RY
|
GEN
|
|
runway (used in RVR measurement)
|
R
|
METAR
|
|
runway alignment indicator
|
RAI
|
ICAO
|
|
runway alignment indicator lights
|
RAIL
|
GEN
|
|
runway arresting gear
|
RAG
|
ICAO
|
|
runway center line
|
RCL
|
ICAO
|
|
runway center line lights
|
RCLL
|
ICAO
|
|
runway centerline light system
|
RCLS
|
GEN
|
|
runway centerline marking
|
RCLM
|
GEN
|
|
runway condition reading
|
RCR
|
GEN
|
|
runway control van
|
VAN
|
ICAO
|
|
runway edge light
|
REDL
|
ICAO
|
|
runway end identifier lights
|
REIL
|
GEN
|
|
runway end light
|
RENL
|
ICAO
|
|
Runway end safety area
|
RESA
|
ICAO
|
|
runway leadin lighting system
|
RLLS
|
ICAO
|
|
runway reference point
|
RRP
|
GEN
|
|
runway reference point downwind
|
RRPD
|
GEN
|
|
runway reference point upwind
|
RRPU
|
GEN
|
|
runway remaining lights
|
RRL
|
GEN
|
|
runway supervisory unit
|
RSU
|
GEN
|
|
runway surface condition
|
RSCD
|
ICAO
|
|
runway threshold light
|
RTHL
|
ICAO
|
|
runway touchdown zone light
|
RTZL
|
ICAO
|
|
runway visibility by observer
|
RVO
|
GEN
|
|
runway visibility value
|
RVV
|
GEN
|
|
runway visual range
|
RVR
|
ICAO
|
|
RVR midpoint
|
RVRM
|
GEN
|
|
RVR midpoint not available
|
RVRMNO
|
GEN
|
|
RVR not available
|
RVRNO
|
GEN
|
|
RVR rollout
|
RVRR
|
GEN
|
|
RVR rollout not available
|
RVRRNO
|
GEN
|
|
RVR ten minute average
|
RVRA
|
GEN
|
|
RVR ten minute average not available
|
RVRANO
|
GEN
|
|
RVR ten minute extremes not
available
|
RVRENO
|
GEN
|
|
RVR touchdown
|
RVRT
|
GEN
|
|
RVR touchdown not available
|
RVRTNO
|
GEN
|
|
RVV not available
|
RVVNO
|
GEN
|
