R

RH Radar Head
RHCP Right Hand Circular Polarisation
RHD Radio (or Radar) Horizon Distance
RHEA Role of the Human in the Evolution of Air Traffic Management systems
RHP Radar Head Processor
RI Route Intercept
RIB Routing Information Base *
RIC Radar Integration Control
RICE RTF Interface Control Equipment
RIG Regional Implementation Group
RIMS Ranging and Integrity Monitoring Station (GNSS-1/EGNOS)
RINAL Portuguese Data Network
RIRP Runway Incursion Reduction Program
RIRT Russian Institute of Radio Navigation and Time (St. Petersburg)
RIS Relational Interface System
RISC Reduced Instruction-Set Computer
RISE Retrieval and Interchange of Standards in Europe
RISO Riso National Laboratory (Denmark)
RISP Radar System Improvement Programme
RIT RADNET Implementation and Integration Team
RITA Réseau Intégré de Transmissions Automatiques (FR)
RITA Replay Interface for TCAS Alerts
RJC Airspace Crossing Reject Message (Airspace Crossing Dialogue)
RLB Rolling Ball
RLBCS Rolling Ball CallSign (input)
RLD Rijksluchtvaartdienst (NL)
RLIM Radar Data Line Interface Module
RLP Remote Line Printer
RLSM Reduced Lateral Separation Minimum
RLW Regie der LuchtWegen (BE) / Régie des Voies Aériennes (BE) / Belgium Aviation
Authority
RMA Reliability, Maintainability, Availability