|
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 airground
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 or
receiver |
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 takeoff
|
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
|
Righthand 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
|
GEN
|
|
RLAOK
|
relay equipment
resumed operation
|
GEN
|
|
RLBG
|
relative bearing
|
GEN
|
|
RLC
|
report landing
completed
|
ATC
|
|
RLCE
|
request level change
en route
|
ICAO
|
|
RLETFL
|
report leaving each
thousand foot level
|
ATC
|
|
RLLS
|
runway leadin
lighting system
|
ICAO
|
|
RLNA
|
request level not
available
|
ICAO
|
|
RLS
|
release
|
GEN
|
|
RLSTN
|
relay station
|
GEN
|
|
RLTK
|
rhumbline track
|
ATC
|
|
RLTV
|
relative
|
GEN
|
|
RLV
|
relieve
|
GEN
|
|
RLVL
|
report level
|
GEN
|
|
RM
|
remarks (PIREP only)
|
ATC
|
|
RMK
|
remark
|
ICAO
|
|
RMLR
|
radar microwave link
repeater
|
GEN
|
|
RMLT
|
radar microwave link
terminal
|
GEN
|
|
RMN
|
remain
|
GEN
|
|
RMPCK
|
ramp check
|
ATC
|
|
RMRK
|
remark
|
GEN
|
|
RN
|
reception nil (radio
logs only)
|
ATC
|
|
RNAV
|
area navigation
|
ICAO
|
|
RNFL
|
rainfall
|
NWS
|
|
RNG
|
Army National Guard
|
GEN
|
|
RNG
|
radio range
|
ICAO
|
|
RNLS
|
resume normal speed
|
ATC
|
|
RNP
|
required navigation
performance
|
ICAO
|
|
RO
|
regional office
|
GEN
|
|
RO
|
regulated output
|
GEN
|
|
ROBEPS
|
radar operating
below prescribed
standard
|
NWS
|
|
ROBEX
|
regional OPMET
bulletin exchange
|
ICAO
|
|
ROC
|
rate of climb
|
ICAO
|
|
ROCC
|
NORAD Region
Operations Control
Center
|
GEN
|
|
ROD
|
rate of descent
|
ICAO
|
|
RODA
|
regardless of
destination airport
|
ATC
|
|
ROFOR
|
route forecast
|
ICAO
|
|
ROLET
|
reference letter
from our office
|
GEN
|
|
ROMEMO
|
reference our
memorandum
|
GEN
|
|
ROMES
|
reference message
from our office
|
GEN
|
|
RON
|
remaining overnight
|
GEN
|
|
ROPBS
|
reference PBS
message from our
office
|
GEN
|
|
RORQN
|
reference
requisition from our
office
|
GEN
|
|
RORU
|
rest of route
unchanged
|
ATC
|
|
ROT
|
rotate
|
GEN
|
|
ROTEL
|
reference telegram
from our office
|
GEN
|
|
ROTG
|
rotating
|
GEN
|
|
ROTWX
|
reference our TWX
|
GEN
|
|
ROV
|
report over
|
ATC
|
|
RP
|
reception poor
(radio logs only)
|
ATC
|
|
RP
|
right traffic
pattern
|
ATC
|
|
RPA
|
request present
altitude
|
ATC
|
|
RPD
|
rapid
|
NWS
|
|
RPFOD
|
reported for duty
|
GEN
|
|
RPI
|
Radar position
indicator
|
ICAO
|
|
RPL
|
repetitive flight
plan
|
ICAO
|
|
RPLC
|
replace
|
GEN
|
|
RPM
|
rotation per minute
|
GEN
|
|
RPOC
|
report proceeding on
course
|
ATC
|
|
RPR
|
repair
|
GEN
|
|
RPRT
|
report
|
GEN
|
|
RPS
|
radar position
symbol
|
ICAO
|
|
RPSG
|
report passing
|
ATC
|
|
RPT
|
repeat
|
GEN
|
|
RPT
|
Repeat or I repeat
|
ICAO
|
|
RQ
|
Indication of a
request
|
ICAO
|
|
RQ
|
request
|
GEN
|
|
RQCL
|
request clearance
|
ATC
|
|
RQDCZ
|
request clearance to
depart VFR and leave
control zone at
|
ATC
|
|
RQECZ
|
request clearance to
enter control zone
VFR at
|
ATC
|
|
RQMNTS
|
requirements
|
ICAO
|
|
RQN
|
requisition
|
GEN
|
|
RQOF
|
request on file
|
ATC
|
|
RQP
|
request flight plan
|
ICAO
|
|
RQP
|
request permission
|
GEN
|
|
RQPP
|
request present
position
|
ATC
|
|
RQR
|
require
|
GEN
|
|
RQRP
|
request reply
|
GEN
|
|
RQS
|
request
supplementary flight
plan
|
ICAO
|
|
RQTAO
|
request time and
altitude over
|
ATC
|
|
RR
|
low or medium
frequency radio
range stations
|
GEN
|
|
RR
|
radar range station
|
GEN
|
|
RR
|
report immediately
upon reaching
|
ATC
|
|
RR
|
report reaching
|
ICAO
|
|
RRBN
|
round robin
|
ATC
|
|
RRCVR
|
remote receiver
|
GEN
|
|
RRL
|
runway remaining
lights
|
GEN
|
|
RRP
|
runway reference
point
|
GEN
|
|
RRPD
|
runway reference
point downwind
|
GEN
|
|
RRPU
|
runway reference
point upwind
|
GEN
|
|
RRS
|
remainder of same
route
|
ATC
|
|
RRTE
|
reroute
|
ATC
|
|
RS
|
receiver station
|
GEN
|
|
RS
|
record special
observation (weather
reports only)
|
NWS
|
|
RS
|
right side
|
ATC
|
|
RSC
|
rescue subcenter
|
ICAO
|
|
RSCD
|
runway surface
condition
|
ICAO
|
|
RSCU
|
rescue
|
GEN
|
|
RSG
|
rising
|
NWS
|
|
RSN
|
reason
|
GEN
|
|
RSOPN
|
resumed operation
|
GEN
|
|
RSP
|
responder beacon
|
ICAO
|
|
RSR
|
en route
surveillance radar
|
ICAO
|
|
RSTR
|
restrict
|
GEN
|
|
RSU
|
runway supervisory
unit
|
GEN
|
|
RSVN
|
reservation
|
GEN
|
|
RT
|
right turn after
takeoff
|
ATC
|
|
RT
|
round trip
|
GEN
|
|
RTB
|
return to base
|
ATC
|
|
RTD
|
delayed
|
ICAO
|
|
RTE
|
route
|
GEN
|
|
RTF
|
radiotelephone
|
GEN
|
|
RTG
|
radiotelegraph
|
GEN
|
|
RTHL
|
runway threshold
light
|
ICAO
|
|
RTMTR
|
remote transmitter
|
GEN
|
|
RTN
|
return
|
ICAO
|
|
RTND
|
retained
|
GEN
|
|
RTNE
|
routine
|
GEN
|
|
RTO
|
report time over
|
ATC
|
|
RTR
|
remote
transmitter/receiver
|
ATC
|
|
RTR
|
returning to ramp
|
ATC
|
|
RTRD
|
retard
|
GEN
|
|
RTRN
|
return
|
GEN
|
|
RTS
|
return to service
|
GEN
|
|
RTT
|
radioteletypewriter
|
GEN
|
|
RTX
|
report time crossing
|
ATC
|
|
RTZL
|
runway touchdown
zone light
|
ICAO
|
|
RUF
|
rough
|
NWS
|
|
RUFORM
|
reference your form
|
GEN
|
|
RULET
|
reference letter
from your office
|
GEN
|
|
RUMEMO
|
reference your
memorandum
|
GEN
|
|
RUMES
|
reference message
from your office
|
GEN
|
|
RURQN
|
reference
requisition from
your office
|
GEN
|
|
RUT
|
standard regional
route transmitting
frequencies
|
ICAO
|
|
RUTEL
|
reference telegram
from your office
|
GEN
|
|
RUTWX
|
reference your TWX
|
GEN
|
|
RV
|
radar vector
|
ATC
|
|
RV
|
rescue vessel
|
ICAO
|
|
RVO
|
runway visibility by
observer
|
GEN
|
|
RVR
|
runway visual range
|
ICAO
|
|
RVRA
|
RVR ten minute
average
|
GEN
|
|
RVRANO
|
RVR ten minute
average not
available
|
GEN
|
|
RVRENO
|
RVR ten minute
extremes not
available
|
GEN
|
|
RVRM
|
RVR midpoint
|
GEN
|
|
RVRMNO
|
RVR midpoint not
available
|
GEN
|
|
RVRNO
|
RVR not available
|
GEN
|
|
RVRR
|
RVR rollout
|
GEN
|
|
RVRRNO
|
RVR rollout not
available
|
GEN
|
|
RVRT
|
RVR touchdown
|
GEN
|
|
RVRTNO
|
RVR touchdown not
available
|
GEN
|
|
RVS
|
revise
|
GEN
|
|
RVV
|
runway visibility
value
|
GEN
|
|
RVVNO
|
RVV not available
|
GEN
|
|
RWRC
|
remain well to right
of course
|
ATC
|
|
RWY
|
runway
|
ICAO
|
|
RY
|
runway
|
GEN
|
