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R-CDL Radar Common Data Link
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R/W read/write
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R&D research and development
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R&M reliability and maintainability
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RA radio altitude
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RA resolution advisories
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RA routing area
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RAA Regional Airline Association
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RAAF Royal Australian Air Force
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RAAS runway awareness and advisory system
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RAC-GAT Russian/American Coordinating Group for Air Traffic Control
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RAC runway analysis chart
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RAD rapid application development
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RAE Royal Aircraft Establishment (Farnborough)
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RAF requirements analysis folder
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RAF Royal Air Force (U.K.)
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RAI radio altimeter indicator
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RAID redundant arrays of independent disks
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RAIM receiver autonomous integrity monitoring
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RALA request automatic line adapter
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RALT radar altimeter
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RAM random access memory
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RAMICS rapid airborne mine clearance system
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RAP required automation performance
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RAS route area statistics (IATA)
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RATMP required air traffic management performance
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RBT reference business trajectory
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RCAG remote control air-to-ground
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RCAT Reconfigurable Cockpit and Avionics Testbed
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RCD radar cable detection
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RCE radio control equipment
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RCF required communications performance
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RCL radio communications link
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RCO remote communications outlet
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RCP radio control panel
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RCR routing and circuit restoral
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RCSU remote control and status unit
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RCU radio control unit
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RCU remote control unit
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RC&W rack connectors and wiring
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RD (taxi) route deviation
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RD routing domain
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RDARA regional domestic air route area
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RDC routing domain confederation
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RDDMI radio digital distance magnetic indicator
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RDF RD format
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RDI radio direction indicator
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RDI RD identifier
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RDP radar data processing
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RDR radar
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RDSS radio determination satellite system
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RDT&E research, development, test and evaluation
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REA radar electronics assembly
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RE&D research, engineering and development
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REDAC Research, Engineering and Development Advisory Committee (FAA)
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REP required environmental performance
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RERB reliability enhancement and re-engining program
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REQ request
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RER residual error rate
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REVS radar-enhanced vision system
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RF radio frequency
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RFC request for comments
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RFG requirement focus group
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RFI radio frequency interference
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RFI request for information
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RFID radio frequency identification
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RFO request for offer
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RFP request for proposal
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RFQ request for quote
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RFU radio frequency unit
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RGB red green blue
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RGCSP Review of the General Concept of Separation Panel (ICAO)
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RGS relay ground station
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RH radio handler
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RHF ridiculously high frequency
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RHO response on handoff
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RHSM reduced horizontal separation minima
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RI runway incursion
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RIB routing information base
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RIN Royal Institute of Navigation (U.K.)
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RIP routing information protocol
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RISC reduced instruction set computer
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RLE response on link establishment
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RLG ring laser gyro
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RLS reliable link service
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RM regional manager
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RM&A reliability, maintainability and availability
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RMCDE radar message conversion and distribution equipment
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RMI radio magnetic indicator
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RMMS remote maintenance monitoring system
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RMP risk management plan
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RMS risk management system
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RMS root mean square
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RNAV area navigation
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RNP required navigation performance
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RNR receive not ready
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RO radio operator
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ROA recognized operating agency
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ROC rate of climb
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ROC rest of operational capability
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ROD rate of descent
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ROIP radio over Internet protocol
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ROM read only memory
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ROM rough order of magnitude
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RON remain over night
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RP routing protocol
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RPDE rapid preliminary development effort
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RPG rocket-propelled grenade
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RPK revenue passenger kilometers
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RPM revolutions per minute
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RPOA Recognized Private Operation Agency (CCITT)
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RR receive ready
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RRI router reference implementation
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RSDP reliable sequencing delivery-confirmation protocol
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RSN regional sub-network
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RSP required surveillance performance
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RSSI received signal strength indicator
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RT radio telecommunication
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RTA required time of arrival
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RTB rocket-towed barrier
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RTC red time clock
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RTCA Radio Technical Commission for Aeronautics (U.S.)
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RTCM Radio Technical Commission for Maritime Services
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RTD resistance temperature detector
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RTK real-time kinematic
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RTM radio transmission module
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RTO rejected takeoff
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RTOS real time operating system
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RTR remote transmitter receiver site
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RTS request to send
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RTSP required total system performance
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RTTI run-time type identification
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RTU radio tuning unit
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RU rack unit (1 inch)
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RVP required vision performance
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RVR runway visual range
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RVSM reduced vertical separation minimum
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RWM R/W memory
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RWP required weather performance
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RWR radar warning receiver
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RX receiver
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RZ return to zero
