R
R & D
R & M
R RHO
R/A
R/L
R/t
R0
R0 x
RA OR RAD ALT
RAA
RABBIT TRACKS
RAD
RADALT
RADAR
RADAR (RADIO DETECTION AND RANGING)
RADAR ADVISORY
RADAR ASTRONOMY
RADAR CONTACT
RADAR FLIGHT FOLLOWING
RADAR HANDOFF
RADAR IDENTIFICATION
RADAR MILE
RADAR SERVICE
RADAR SUVEILLANCE
RADAR VECTOR
RADIAL
RADIATION
RADIATION PRESSURE
RADIATION SHIELD
RADIATOR
RADIO
RADIO ASTRONOMY
RADIO FIX
RADIO METEOR
RADIO TELESCOPE
RADIOSONDE
RADOME
RAE
RAF
RAI
RAIM
RAIN GAUGE
RAINBOW
RAINFALL
RALT
RAM
RAMP
RAPPS
RAR
RAS
RAT
RATE AIDING
RAV
RB
RBBKUP
RBDA
RBHA
RBL
RBN
R-C
R-C
R-C&W
RCAG
RCB
RCC
RCCB
rcdr
RCE
RCFD
RCL
RCLM
RCLS
RC-MAP
RCO
RCP
RCS
RCT
RC-TCP
RCU
RCVR
RCVR/XMTR
Rd
RDALT
RDARA
RDC
RDE
RDF
RDI
RDIS
RDMI
RDNG
RDO
RDP
RDR
RDSS
RDU
RDV
RDVS
REACT
REACTION CONTROL SYSTEM
REACTION ENGINE
READOUT
READOUT STATION
REAL TIME
REC
RECAP
RECCE
RECIRCUIT
RECOMBINATION
RECOVERY
RECT
RECYCLE
RED
RED BCN
RED SHIFT
REENTRY
REENTRY VEHICLE
REENTRY WINDOW
REF
REFL
REFLD
REFLECTIVITY FACTOR (Z)
REFRIG
REGENERATIVE COOLING
REGENERATOR
REGIONAL CARRIER
REI
REIL
REL
RELATIVE BEARING
RELATIVE HUMIDITY
RELATIVISTIC
RELATIVITY
REMOTE
RENDESVOUS
REP
REPEATABLE ACCURACY
REPORTING POINT
REQ
RER
RESCUE COORDINATION CENTER (RCC)
RESOLUTION ADVISORY
RESP
RESTR
RESTRICTED AREA
RESYNCING
RET
RETDISK
RETR
RETROROCKET
REU
REV
REVENUE PASSANGER MILE (RPM)
REVOLUTION
REW
REX
RF
RFC
RFD
RFEU
RFF
RFI
RFP
RFSIVV
RFT
RFTP
RFU
RGB
RGCSP
RGLTR
RH
RHO
RHSM
RHUMB LINE
RI
RIA
RIB
RICC
RIDGE
RIFU
RIME
RIP
RIS
RISC
RIU
RJ
RJE
Rkt
RLC
RLD
RLE
RLG
RLI
RLK
RLOUT
RLP
RLPT
RLS
RLSD
RLW
RLY
RM&A
RMA
RMI
RMM
RMMS
RMP
RMS
RMT
RMU
R-NAV
RNG
RNGA
RNP
RNR
Rns
RNTP
RO
ROA
ROB
ROC
ROCKET
ROCKET ENGINE
ROCKET PROPELLANT
ROCKETSONDE
ROCKOON
ROD
ROL
ROLL
ROLL
ROLL CLOUD
ROLL STRG
ROLLOUT
ROLLOUT RVR
ROM
ROT
ROTATION
ROTHR
ROUTE
RP
RPDR
RPDU
RPI
RPM
RPOA
RPS
RPTG
RPTR
RPU
RPV
RR
RR
RRATE
RRF
RRI
RRS
RS
RS 232
RSB
RSDP
RSN
RSP
RSSI
RST
RSTR
RSU
RSVD
RT
RTA
RTB
RTC
RTCA
RTCA DO-160
RTCU DO-178
RTD
RTE
RTF
RTH
RTI
RTL
RTM
RTN
RTO
RTOK
RTOS
RTOW
RTP
RTR
RTS
RTS/NS
RTSP
RTSS
RTTI
RTU
RTV
RTW
RUAC
RUAD
RUAE
RUD
RUDDER
RUMBLE
RUNWAY INCURSION
RUUT
RUW
RV
RVDT
RVE
RVI
RVO
RVR
RVS
RVSM
RVV
RW
RWM
RWR
RWS
RWY
RX
RXU
RZ