|
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
|
|