aviation acronyms and abbreviations > R

R: Receiver 
R: Red 
R: Reserve 
R: Reset 
R: Revised 
R: Right 
R: Romeo 
R&D: Research & Development 
R&SS: Repair & Salvage Section 
R&SU: Repair & Salvage Unit 
R-CLB: Reduced Climb 
R/A: Radio Altimeter 
R/A: Radio Altitude 
R/D: Refuel/Defuel 
R/G: Rear Gunner 
R/H: Right Hand 
R/I: Radio/Inertial 
R/I: Removal/Installation 
R/I: Remove/Install 
R/L: Reading Light 
R/T: Radio Telegraphy 
R/T: Radio Transmit 
R/T: Radiotelephony 
R/T: Required Time of Arrival 
R/T: Round Trip 
R/W: Runway 
RA: Radio Altimeter 
RA: radio altitude 
RA: rain 
RA: Resolution Advisory 
RAAF: Royal Australian Air Force 
RAAF: Royal Auxiliary Air Force 
RABS: Reverse Actuated Bleed System 
RAC: Rotor Active Clearance 
RAC/SB: Rotor Active Clearance/Start Bleed 
RACC: Rotor Active Clearance Control 
RACCS: Rotor Active Clearance Control System 
racon: radar beacon 
RAD: radial 
RAD: Radio