O  P  Q  R  OAT—Outside Air Temperature  OBS—Omni Bearing Selector  OCS—Obstacle Clearance Surface  ODP—Obstacle Departure Procedure  OpSpecs—Operations Specifications  OROCA—Off-Route Obstruction Clearance Altitude  OSV—Operational Service Volume  PA—Precision Approach  PAR—Precision Approach Radar  PCG—Positive Course Guidance  PDC—Pre-Departure Clearance  PDR—Preferential Departure Route  PF—Pilot Flying  PFD—Primary Flight Display  PI—Principal Inspector  PIC—Pilot In Command  PIREP—Pilot Weather Report  PKI—Public/Private Key Technology  PM—Pilot Monitoring  POH—Pilot’s Operating Handbook  POI—Principle Operations Inspector  PRM—Precision Runway Monitor  P-RNAV—European Precision RNAV  PT—Procedure Turn  PTP—Point-To-Point  QFE—Transition Height  QNE—Transition Level  QNH—Transition Altitude  RA—Resolution Advisory; Radio Altitude  RAIM—Receiver Autonomous Integrity Monitoring  RAL—Research Applications Laboratory  RCO—Remote Communications Outlet  RJ—Regional Jet  RNAV—Area Navigation  RNP—Required Navigation Performance  RNP AR—Required Navigation Performance Authorization Required  ROC—Required Obstacle Clearance  RSP—Runway Safety Program  RVR—Runway Visual Range  RVSM—Reduced Vertical Separation Minimums  RVV—Runway Visibility Value  RWY—Runway  RWY WP—Runway Waypoint  B-6 