RAM Random Access Memory. Generally used to describe
read/write integrated circuit memory.
RAPPS Remote Area Precision Positioning System
RAS Row Address Strobe
RAT RAM Air Temperature is the temperature of the air
entering an air scoop inlet. It is a factor in engine
performance.
RBS Ration by Schedule
R-C Resistor-Capacitor network
RCC Remote Charge Converter
RCP Radio Control Panel
RCVR Receiver
Rd R-Channel used for data
R & D Research and Development
RDMI Radio Distance Magnetic Indicator
RDR Radar
RDSS Radio Determination Satellite Service
RE&D Research,Engineering and Development
RECAP Reliability Evaluation and Corrective Action Program
REFL Reflection
Reflectivity This is a measurement of the ability of a target to
Factor (Z) reflect the energy from a radar beam.
Relative The bearing of a ground station relative to the direc
Bearing tion the aircraft nose points,or the direction of an air
craft to or from an NDB.
REL Relative
Resolution A display indication given to the pilot recommending
Advisory a maneuver to increase vertical separation relative to
an intruding aircraft. A resolution advisory is also clas
sified as corrective or preventive.
RET (1) Rapid Exit Taxiway
(2) Reliability Evaluation Test
REU Remote Electronics Unit
RF Radio Frequency. A general term for the range of fre-
quencies above 150 kHz,to the infra-red region (1012
Hertz).
RFI Radio Frequency Interference
RFP Request For Proposal
RFTP Request For Technical Proposal
RFU Radio Frequency Unit
RGCSP Review of the General Concept of Separation Panel
RIB Right Inboard
RIN UK Royal Institute of Navigation
RLS (1) Remote Light Sensor
(2) Reliable Link Source
RLY Relay
R & M Reliability and Maintainability
RMI Radio Magnetic Indicator
RMP Remote Maintenance Panel
RMS Root Mean Square
RNAV Random Navigation/Area Navigation
RNG Range
RNGA Range Arc
RNP Required Navigation Performance
RO Roll Out
ROB Right Outboard
ROC Rate Of Climb
ROD Rate of Descent
ROI Return On Investment
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