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see also: aircraft-based augmentation system (ABAS)

Fr: contr.le autonome de l’intégrité par le récepteur
receiver only
The capability to receive radio communications only, owing to the absence or failure of the transmitter.
. abbreviation: RONLY
Fr: récepteur seulement
reciprocal tracks An expression used by ATS in the application of separation to indicate tracks that converge or diverge at an angle of 136° to 180° inclusive. Fr: routes inverses
“Recleared” ICAO: An expression used in radiocommunication meaning “A change has been made to your last clearance and this new clearance supersedes your previous clearance or part thereof.” Fr: . Réautorisé .
reduced vertical separation minimum The application of 1000-ft vertical separation at and above FL 290 between RVSM certified aircraft operating in designated airspace.
. abbreviation: RVSM
Fr: minimum réduit d’espacement vertical
rejected landing Other expression for: aborted landing
rejected takeoff Other expression for: aborted takeoff
release time U.S.: Expression for: “Clearance valid . . .”
remote aerodrome advisory service The provision, by FSSs via remote communications outlets (RCO), of information pertinent to the arrival and departure phases of flight and for transit through a mandatory frequency (MF) area. 
. abbreviation: RAAS
Fr: service consultatif télécommandé d’aérodrome
remote communications air/ground facility U.S.: Expression for: peripheral station (PAL)