Welcome to the master pilot acronym list. This list includes acronyms, abbreviations, and contractions for aviation use. This list also includes acronyms for notices to air missions (NOTAM), FAA, and Controller terms. If we missed one let us know!
P P In RVR indicates visibility greater than highest reportable sensor value P Pacific Standard Time (time group only) P Polar (air mass) P Precision approach terrain chart P Prohibited area P/CG pilot controller glossary P2R2 Preferred Route Reduction Program P6SM visibility greater than 6 SM (TAF only) PA Passenger Address PA Precision Approach PA Pressure Altitude PA Project Authorization PABX Private Automated Branch Exchange PAC Pacific PACF Parent FSS assumes control of part time FSS PACOTS Pacific Organized Track System PAD Packet Assembler/Disassembler PADRA Pass to Air Defense Radar PAEW Personnel and Equipment Working PAFAM Performance and Failure Assessment Monitor PAJA Parachute Jumping Activities PALS Precision Approach Lighting System PALT Present Altitude PAM Ambient Pressure PAM Peripheral Adapter Module PAM Pulse Amplitude Modulation PAMA Professional Aviation Maintenance Association PAMRI Peripheral Adapter Module Replacement Item PANS Procedures for Air Navigation Services PAP Pro Air Pilot PAPI Precision Approach Path Indicator PAR Precision Approach Radar PAR Preferential Arrival Route PARA Paragraph PARA/SER Parallel-to-Serial PAREN Parenthesis PARL Parallel PARROT Position Adjustable Range Reference Orientation Transponder PAS Performance Advisory System PAS Project Assignment Sheet PASS Professional Airway System Specialists PAT Pattern PATS Precision Approach Tracking System PATT Pitch Attitude PATWAS Pilots Automatic Telephone Weather Answering Service PAU Present Address Unknown PAX Passenger PB Burner Pressure PBB Pitch Bar Bias PBCT Proposed Boundary Crossing Time PBE Protective Breathing Equipment PBL Probable PBN Performance-Based Navigation PBR Pilot’s Bill of Rights PBRF Pilot Briefing PBS Public Buildings Service PBX Private Branch Exchange PC Proficiency Check PCA Positive Control Airspace PCA Positive Control Area PCA Power Control Actuator PCB Personnel Compensation and Benefits PCB Plenum Chamber Burning PCB Printed Circuit Board PCB&T Personnel Compensation Benefits and Travel PCCD Printed Circuit Board PCD Proceed PCK Pilot Check PCL Pilot Controlled Lighting PCM Pulse Code Modulation PCN Pavement Classification Number PCN Project Control Number PCPL Pitch Couple PCPN Precipitation PCPS Purchase Card Processing System PCS Permanent Change of Station PCS Power Conditioning System PCS Production Control System PCU Power Control Unit PCWS Pitch Control Wheel Steering PD Period PD Pilot Deviation – A surface event caused by a pilot in aircraft under power PDA Personal Digital Assistant PDAR Preferential Arrival and Departure Route PDC Pre Departure clearance PDC Program Designator Code PDCS Performance Data Computer System PDDC Proceed Directly on Course PDF Portable Document Format PDMT Predominant PDMT Predominate PDN Public Data Network PDO Phosphorus-Doped Oxide PDOP Position Dilution of Precision PDR Preferential Departure Route PDS Proficiency Development Specialists PDT Pacific Daylight Time PDU Pilot's Display Unit PDW Priority Delayed Weather PE Private Pilot Examiner PECASUS Pan-European Consortium for Aviation Space Weather User Services PECO Pitch Erection Cutoff PED Personal Electronic Devices PED Portable Electronic Device PELS Precision Emitter Location System PEN Peninsula PENT Penetrate or penetration PER Performance PERCOM Peripheral Communications PERF Perforator PERM Permanent PF Pilot Flying PFAST Passive Final Approach Spacing Tool PFC Passenger Facility Charge PFC Porous Friction Course PFD Primary Flight Display P-FET P-Type Conduction Field Effect Transistor PFSV Pilot to Forecaster Service PGF Pressure Gradient Force PGM Precision Guided Munition PGMM Program Management Methodology PGP Planning Grant Program PGTSND Puget Sound PHA Preliminary Hazard Analysis PHL Preliminary Hazard List PHOLD Pitch Hold PHOT-SCR Photosensitive Silicon Controlled Rectifier PHYS Physical PIB Preflight information bulletin PIBAL Pilot Balloon Observation PIBALS Pilot Balloon Reports PIC Pilot In Command PIC Principal Interexchange Carrier PIDP Programmable Indicator Data Processor PII Personally Identifiable Information PIM Program Implementation Manager PINS Point-in-Space PIO Pilot Induced Oscillation PIP Primary Interface Processor PIP Program Implementation Plan PIR Precision Instrument Runway PIREP Pilot Weather Report PIREPS Pilot Weather Reports PIRFC Pilot Requests Forecast PISE No pilot balloon observation due to unfavorable sea conditions PISO No pilot balloon observation due to snow PIT Pilot Instructor Training PIU Peripheral Interface Unit PIWI No pilot balloon observation due to high, or gusty, surface wind PJE Parachute Jumping Exercise PJFET P-Type Junction-Conduction Field Effect Transistor PJMM Project Management Methodology PJSA Project Scope Agreement PK WND Peak Wind (Weather reports only) PKI Public Key Infrastructure PL Ice Pellets PL Public Law PLA Power Level Angle PLA Practice Low Approach PLA Programmable Logic Array PLASI Pulsating Visual Approach Slope Indicators PLAT Present Latitude PLF Private Line Telephone PLL Phase-Locked Loop PLN Flight Plan PLNS Plains PLOB Place of Birth PLONG Present Longitude PLS Please PLT Private Line Teletypewriter PLTO Plateau PLVL Present Level PLW Plow (snow) PM Phase Modulated PM Post Meridiem PM Preventive Maintenance PMA Parts Manufacturer Approval PMAT Portable Maintenance Access Terminal PMB Plastic Media Blasting PMC Project Materials Cumulative PML Project Material List PMOS P-Type Metal Oxide Silicon Semiconductor PMS Performance Management System PMS Program Management System PMSN Permission PMT Permit PN Prior Notice Required PNCS Performance Navigation Computer System PND Primary Navigation Display PNF Pilot Not Flying PNHDL Panhandle PNR Point of No Return PO Dust Devils PO Post Office PO Purchase Order POA Privately Owned Aircraft POB Persons On Board POC Point-of-Contact POC Proceed or proceeding on course POCC Pacific Operations Control Center POES Polar Operational Environment Satellite POH Pilot's Operating Handbook POI Principle Operations Inspector POP Point-0f-Presence POS Positive POSLY Positively POSS Possible POT Point-of-Termination POT Poteniometer POV Privately Owned Vehicle PP Pay Period (number) PPE Personal Protective Equipment PPE Pilot Proficiency Examiner PPE Private Pilot Examiner PPI Plan Position Indicator PPIMS Personal Property Information Management System PPINA Radar weather report not available (or omitted for a reason different than those otherwise stated) PPINE Radar weather report no echoes observed PPINO Radar weather report equipment inoperative due to breakdown PPIOK Radar weather report equipment operation resumed PPIOM Radar weather report equipment inoperative due to maintenance PPM Parts Per Million PPM Pulse Position Module PPR Personal Property Report PPR Prior Permission Required PPS Propose PPSN Present Position PR Partial PR Photo Reconnaissance PR Pressure Ratio PR Procurement Request PR Project Review / Program Review PRA Precision Radar Approach PRAM Programmable Analog Module PRBL Probable PRBLTY Probability PRBLY Probably PRBO Position Relief Briefing Observed PRCF Parent FSS returns control of part time FSS PRCHT Parachute PRCTN Precaution PRD Pilot Record Database PRECD Precede PRECDD Preceded PRECDG Preceding PRECDS Precedes PREF Preferred PRES Pressure PRESFR Pressure Falling Rapidly PRESRR Pressure Rising Rapidly PREV Previous PRF Pulse Repetition Frequency PRFG Partial Fog PRI Primary PRI Primary Rate Interface PRICE Required Oxygen Checklist. Pressure, Regulator, Indicator, Connections, Emergency. PRIM Primary PRIN Principal PRIND Present Indications Are PRIRA Primary Radar PRJMP Pressure Jump (weather reports only) PRKG Parking PRL Parallel PRM Precision Runway Monitor PRN Pseudo Random Noise PROB Probability PROB30 Probability 30 Percent, Slight Chance PROB40 Probability 40 Percent PROC Procedure PROCD Proceed PROD Produce PRODG Producing PROG Prognosis or prognostic PROG Progress PROGD Forecasted PROGS Forecasts PROM Programmable Read Only Memory PROP Propeller PROPA Propagation PROSIG Procedure Signal PROV Provisional PROX Proximity PRP Prepare PRR Pulse Repetition Rate PRSNT Present PRSNTLY Presently PRST Persist PRSTNC Persistence PRSTNT Persistent PRSTS Persists PRT Power Recovery Turbine PRVD Provide PRVDD Provided PRVDG Providing PRVDS Provides P-S Parallel-to-Serial PS Passenger Service PS Plus PS Power Supply PSAS Pitch Stability Augmentation System PSBL Possible PSBLTY Possibility PSBLY Possibly PSBT Pilot Self Briefing Terminal PSC Program Support Center PSD Process Support Document PSDN Public Switched Data Network PSEU Proximity Switch Electronic Unit PSG Passage PSG Passing PSGR Passenger PSI Pounds Per Square Inch PSIA Pounds Per Square Inch Absolute PSID Pounds Per Square Inch Differential PSIG Pounds Per Square Inch Gage PSL Polycrystalline Silicon Layer PSL Projected Service Life PSM Power Supply Module PSN Packet Switched Network PSN Position PSNAL Personal PSND Positioned PSNL Personnel PSNRP Position Report PSO Phase Shift Oscillator PSP Pierced Steel Planking PSR Packed Snow on Runway PSR Primary Surveillance Radar PSR Project Status Report PSRI Position Subject to Return of Incumbent PSRS Position Subject to Rotating Shifts PSS Packet Switched Service PST Pacific Standard Time PSTN Public Switched Telephone Network PSU Passenger Service Unit PSU Power Supply Unit PSYNC Pitch Synchronization PT Procedure Turn PT Product Team PT Total Pressure PTC Plan to Clear PTC Positive Target Control PTC Presumed-to-Conform PTCHY Patchy PTCP Participate PTD Propagation Time Delay PTH Plated-Through Hole PTLY Partly PTM Pulse Time Modulation PTN Portion PTN Procedure Turn PTNL Potential PTNLY Potentially PTNS Portions PTP Point To Point PTR Part-Throttle Reheat PTR Printer PTR Program Technical/Trouble Report PTRS Program Tracking and Reporting Subsystem PTS Polar Track Structure PTS Practical Test Standards PTS Procedures Tracking System PTT Push To Talk PUB Public PUB Publication PUBL Publish PUP Pickup PUP Principal User Processor PVA Positive Vorticity Advection PVASI Pulsating Visual Approach Slope Indicator PVC Permanent Virtual Circuit PVD Plan View Display PVL Prevail PVLD Prevailed PVLG Prevailing PVLS Prevails PVLT Prevalent PVT Private PW Pratt and Whitney PWB Pilot Weather Briefing PWI Proximity Warning Indicator PWINO Precipitation identifier information not available (weather reports only) PWR Power PWR SPLY Power Supply PWRNO Power Failure PWROK Power Restored PY Spray Q QA Quality Assurance QAE Quality Assurance Evaluator QAR Quality Assurance Resource QAR Quick Access Recorder QC Quality Control QDL Question asking for a series of bearings typically used in ICAO QDM Magnetic Heading QDR Magnetic Bearing QEC Quick Engine Change QECA Quick Engine Change Assembly QFE Atmospheric pressure at airport elevation QFE Transition Height QFLOW Quota Flow Control Procedures QFU Magnetic Orientation of Runway QGE Question asking distance to station typically used in ICAO QJH Shall I run my test tape/a test sentence QLFY Qualify QLTY Quality QMS Quality Management System QN Question QNE Transition Level QNH Altimeter subscale setting to obtain elevation when on the ground QNH Transition Altitude QNTY Quantity QPFERD NMC excessive rainfall discussion QPFHSD NMC heavy snow discussion QPFSPD NMC special precipitation discussion QSP Question asking for free of charge relay in ICAO QSTNRY Quasi Stationary QTA Shall I cancel telegram number? QTE True bearing QTR Quarter QUAD Quadrant QUE Quebec QUJ Questions asking for TRUE track in degrees and time in ICAO R _ R Acknowledgement of receipt (message handling) R Received (acknowledgement of receipt) R Restricted area (followed by identification) R Right (runway identification) R Runway (used in RVR measurement) R Radial R Receive R Restricted Area (Special Use Airspace) R&D Research and Development R,E&D Research, Engineering and Development R/HOLD Roll Hold R/O Receive Only R/OC Receive Only Centers R/T Receiver/Transmitter R/W Read/Write RA Radio Altimeter RA Rain RAA Regional Airline Association RAA Remote Airport Advisory RAAF Royal Australian Air Force RABA No Balloons Available RABAL Radiosonde Balloon Wind Data RABAR Radiosonde Balloon Release RAC Request Altitude Change RAC Rules of the Air and Air Traffic Services RACE Request Altitude Changes En Route RACFI Radio and Communication Facilities Inoperative RACO No RAWIN Observation Communications Out RACON Radar Responder Beacon RAD Radio RADAR Radio Detection and Ranging RADAT Radiosonde Observation Data RADEP Radar Departure RADLO Regional Air Defense Liaison Office RADNO Report missing account radio failure RADON Radar Beacon RADS Retardant Aerial Delivery System RADU Weather Radar Analysis and Development Unit RAF Royal Air Force RAFC Regional Area Forecast Center RAFI Radiosonde Observation Not Filed RAFRZ Radiosonde Observation Freezing Levels RAG Ragged RAG Runway Arresting Gear RAGF Remote Air Ground Facility RAHE No RAWIN observations no gas available RAI Runway Alignment Indicator RAICG Radiosonde Observation Icing At RAIL Runway Alignment Indicator Lights RAIM Receiver Autonomous Integrity Monitoring RAIND Radio Altimeter Indicator RAIS Remote Airport Information Service RAJAM Radar Jamming RALT Regardless of Altitude RALU Register and Arithmetic Logic Unit RAM Random Acess Memory RAM Returned Account Mechanical RAOB Radarsonde Observation RAOB Radiosonde Observation RAOBS Radiosonde observations RAPCO Radar Approach Control (USAF) RAPCON Radar Approach Control RAPI Radiosonde report already sent in RAPPI Random Access Plan Position Indicator RARAD Radar Advisory RAREP Radar Weather Report RAS Random Access Store RASC Regional AIS system center RASH Rain Showers RASN Rain and snow or showers of rain and snow RASP Regional Airport System Plan RAT Ram Air Turbine RAT Risk Assessment Team RATCC Radar Air Traffic Control Center RATCF Radar Air Traffic Control Facility (USN) RATO Rocket Assisted Takeoff RATR Radio Altimeter Transmitter/Receiver RAVU Radiosonde Analysis and Verification Unit RAWE No RAWIN observations unfavorable weather RAWI No RAWIN observations high and gusty winds RAWIN Upper winds observation (by radio methods) RAWX Returned Account Weather RB Rescue Boat RB Right Base RBA Radio Bearing Annunciator RBB Roll Bar Bias RBC Rotating Beam Ceilometer RBDE Radar Bright Display Equipment RBDPE Radar Beacon Data Processing Equipment RBN Radio Beacon RBOC Report Back On Course RBOF Report Back On Frequency RBPM Remote Beacon Performance Monitor RBS PP (RBS) Ration by schedule plus compression RBS Radar Bomb Scoring RBSS Radar Bomb Scoring Squadron RC Reverse Course RC Road Reconnaissance RCA Reach Cruising Altitude RCADV Reverse Course and Advise RCAG Remote Communications Air/Ground RCALT Reach Cruising Altitude RCAS Radio Coverage Analysis System RCC Rescue Coordination Center RCCB Remote Control Circuit Breaker RCCC Regional Communications Control Center RCD Radar Cloud Detection Report RCDNA Radar Cloud Detection Report Not Available RCDNE Radar Cloud Detection Report No Echoes Observed RCDNO Radar cloud detector inoperative due to breakdown until RCDOM Radar cloud detector inoperative due to maintenance until RCE Radio Control Equipment RCF Radio Communication Failure RCF Remain on Company Frequency RCF Remote Communications Facility RCH Reach RCHD Reached RCHG Reaching RCHS Reaches RCIU Remote Control Interface Unit RCK Radio Check RCKY Rockies (mountains) RCKYS Rockies RCL Radio Communications Link RCL Runway Center Line RCLL Runway Centerline Lights RCLM Runway Centerline Marking RCLR Radio Communications Link Repeater RCLR RCL Repeater RCLS Runway Centerline Light System RCLT Radio Communications Link Terminal RCLT RCL Terminal RCM Reliability Centered Maintenance RCMD Recommend RCMDD Recommended RCMDG Recommending RCMDS Recommends RCN Royal Canadian Navy RCO Remote Communications Outlet RCOM En Route Communications RCON Reconfiguration RCPT Receipt RCR Runway Condition Reading RCRD Record RCRDS Records RCS Rehost Computer System RCU Remote Control Unit RCV Receive RCVD Received RCVG Receiving RCVNO Receiving Capability Out RCVR Receiver RCVR/XMTR Receiver/Transmitter RCVS Receives RCWS Roll Control Wheel Steering RD Requirements Document RDARA Regional and Domestic Air Route Area RDAT Radar Data (digitized) RDC Reduce RDF Radio Direction Finder RDG Ridge RDGG Ridging RDH Reference Datum Height (ILS) RDL Radial RDMI Radio Direction Magnetic Indicator RDO Radio RDOF Radio Failure RDP Radar Data Processing RDR Radar RDS Radius RDSIM Runway Delay Simulation Model RDSP Redispatch RDSPA Redispatch Accepted RDVLP Redevelop RDVLPG Redeveloping RDVLPMT Redevelopment RDVS Rapid Deployment Voice Switch RDWND Radar Dome Wind RE Regard RE Resident Engineer REC Receive or receiver RECLR Recleared RECON Reconnaissance RECON Reference Conversation REDAC Research, Engineering & Development Advisory Committee REDL Runway Edge Light REDMACS Research, Engineering, and Development Monitoring, Analysis and Control System REF Reference REFONE Reference our telephone conversation REFORM Reference Form REG Registration REG Regulation REGAL Range and Elevation Guidance for Approach and Landing REGIS Regional Information System REIB Report Established In Block REIL Runway End Identification Light REINV Reference Invoice RELBL Reliable RELCT Relocate RELET Reference Letter REMES Reference Message REMT Relief Electronic Maintenance Technician RENL Runway End Light RENOT Regional office notice REOC Report when established on course REP Report or reporting point REP Represent or representative REP Research Project REPAML Reply By Airmail REPBS Reference PBS Message REPERF Reperforator REPL Replace REPLD Replaced REPLG Replacing REPLS Replaces REPMES Reply By Message REPML Reply By Mail REPTWX Reply By TWX REQ Request REQID Request If Desired REQON Request Consideration REQRCM Request Your Recommendation REQS Requests REQSTD Requested RERTE Reroute RES Reserve RES Resident RESA Runway End Safety Area RESP Response RESTR Restrict REV/C Reverse Course REWRC Report When Established Well to Right of Course RF CYCLE Refresh Cycle RF Radar Facility (USN) RF Radio Frequency RF Reception Fair (radio logs only) RF Radius-to-Fix RFA Request Further Airways RFI Radio Frequency Interference RFI Ready for Issue RFI Request for Information RFI Return on Future Investment RFL Refuel RFM Rotorcraft Flight Manual RFQ Request for Quotes RFS Refuse RFT Runway Friction Tester RFTO Ready for Takeoff RG Range (lights) RG Reception Good (radio logs only) RGD Ragged RGL Regional Model RGLR Regular RGN Region RGNS Regions RGT Right RH Relative Humidity RHC Right Hand Circuit RHI Range Height Indicator RHINO Radar Echo Height Information Not Available RHINO Radar Range Height Indicator Not Operating on Scan RI Runway Incursion RIF Reclearance in Flight RIF Reduction in Force RIG Rigger Computer Knowledge Test RIIEP Runway Incursion Information Evaluation Program RIMAT Must Ride Company Material RIOGD Rio Grande RIP Runway Incursion Program RIS Reports Identification Symbol RITC Request in Trail Climb RITD Request in Trail Descent RITE Right (Direction of turn) RJ Regional Jet RL Report immediately upon leaving RL Report Leaving RLA Relay To RLANO Relay equipment out of operation RLAOK Relay equipment resumed operation RLBG Relative Bearing RLBL Reliable RLC Radial-Lead Capacitor RLC Report Landing Completed RLCE Request Level Change En Route RLETFL Report Leaving Each Thousand Foot Level RLLS Runway Leading Lighting System RLNA Request Level Not Available RLS Release RLS Remote Light Sensor RLSTN Relay Station RLTK Rhumbline Track RLTV Relative RLTVLY Relatively RLV Relieve RLV Reusable Launch Vehicle RLVL Report Level RM Remarks (PIREP only) RM Risk Management RMCC Remote Monitor Control Center RMCF Remote Monitor Control Facility RMI Radio Magnetic Indicator RMK Remark RML Radar Microwave Link RMLR Radar Microwave Link Repeater RMLR RML Repeater RMLS Remote Monitoring and Logging System RMLT Radar Microwave Link Terminal RMLT RML Terminal RMM Remote Maintenance Monitoring RMMC Remote Maintenance Monitoring and Control RMMS Remote Maintenance Monitoring System RMMS Remote Maintenance Monitoring Systems RMN Remain RMND Remained RMNDR Remainder RMNG Remaining RMNS Remains RMPCK Ramp Check RMRK Remark RMS Remote Maintenance Subsystem RMS Remote Monitoring Subsystem RMS Risk Management System RMSC Remote Monitoring Subsystem Concentrator RMT Resource Management Tool RMT Risk Management Team RN Reception Nil (radio logs only) RNAV Area Navigation RNFL Rainfall RNG Army National Guard RNG Radio Range RNLS Resume Normal Speed RNP Required Navigation Performance RNP-10 Required Navigation Performance-10 lateral nautical miles RNP AR Required Navigation Performance Authorization Required RO Regional Office RO Regulated Output ROA Record of Assistance ROB Radar Observation ROBEPS Radar Operating Below Prescribed Standard ROBEX Regional OPMET bulletin exchange ROC Rate of Climb ROC Regional Operations Center ROC Required Obstacle Clearance ROCC NORAD Region Operations Control Center ROD Rate of Descent ROD Record of Decision RODA Regardless of Destination Airport ROFOR Route Forecast ROLET Reference Letter from our office ROM Read-Only Memory ROMEMO Reference our memorandum ROMES Reference message from our office RON Remaining Overnight ROPBS Reference PBS message from our office RORQN Reference requisition from our office RORU Rest of Route Unchanged ROSA Report of Service Activity ROSHM Regional Occupational Safety and Health Manager ROT Rotate ROT Runway Occupancy Time ROTD Rotated ROTEL Reference telegram from our office ROTG Rotating ROTS Rotates ROTWX Reference our TWX ROV Report Over RP Reception Poor (radio logs only) RP Restoration Priority RP Right traffic pattern RPA Request Present Altitude RPC Restoration Priority Code RPD Rapid RPDLY Rapidly RPE Remote Pilot Examiner RPFOD Reported For Duty RPG Radar Processing Group RPI Radar Position Indicator RPI Real Property Inventory RPL Repetitive flight plan RPLC Replace RPLCD Replaced RPLCG Replacing RPLCS Replaces RPM Rational Portfolio Manager RPM Revenue Passenger Mile RPM Rotation Per Minute RPM RTP Program Manager RPMES Regional Program Manager for Environment and Safety RPOC Report Proceeding On Course RPOC Risk Point-of-Contact RPR Real Property Report RPR Repair RPRT Report RPRTD Reported RPRTG Reporting RPRTS Reports RPS Radar Position Symbol RPS Revolutions Per Second RPSG Report Passing RPT Repeat RPTG Repeating RPTS Repeats RPV Remotely Piloted Vehicle RPZ Runway Protection Zone RQ Indication of a request RQ Request RQCL Request Clearance RQDCZ Request clearance to depart VFR and leave control zone at RQECZ Request clearance to enter control zone VFR at RQMNTS Requirements RQN Requisition RQOF Request On File RQP Request Flight Plan RQP Request Permission RQPP Request Present Position RQR Require RQRD Required RQRG Requiring RQRP Request Reply RQRS Requires RQS Request supplementary flight plan RQTAO Request Time and Altitude Over RR Low or medium frequency radio range stations RR Report immediately upon reaching RR Report Reaching RR Road Reconnaissance RRBN Round Robin RRCS Remote Radio Control System RRCVR Remote Receiver RRH Remote Reading Hygrothermometer RRHS Remote Reading Hydrometer RRL Runway Remaining Lights RRP Runway Reference Point RRPD Runway Reference Point Downwind RRPU Runway Reference Point Upwind RRS Remainder of same route RRTE Reroute RRWDS Remote Radar Weather Display RRWSS RWDS Sensor Site RS Receiver Station RS Record special observation (weather reports only) RS Right Side RSA Runway Safety Area RSAP Runway Safety Action Plan RSAS Roll Stability Augmentation System RSAT Runway Safety Action Team RSC Rescue Subcenter RSCD Runway Surface Condition RSCU Rescue RSG Rising RSL Runway Status Light RSN Reason RSNG Reasoning RSNS Reasons RSOPN Resumed Operation RSP Responder beacon RSP Runway Safety Program RSR En route Surveillance Radar RSS Relaxed Static Stability RSS Remote Speaking System RSTR Restrict RSTRD Restricted RSTRG Restricting RSTRS Restricts RSU Remote Switching Unit RSU Runway Supervisory Unit RSVN Reservation RT Remote Transmitter RT Right turn after takeoff RT Round Trip RT&BTL Radar Tracking and Beacon Tracking Level RTAD Remote Tower Alphanumeric Display RTB Return To Base RTCA Radio Technical Commission for Aeronautics RTD Delayed RTDS Radar Terminal Display System RTE Route RTF Radiotelephone RTG Radiotelegraph RTHL Runway Threshold Light RTL Resistor-Transistor Logic RTM Rolls-Royce-Turbomeca RTMTR Remote Transmitter RTN Return RTND Retained RTNE Routine RTO Rejected Take Off RTO Report Time Over RTP Regional Transportation Plan RTR Remote Transmitter/Receiver RTR Returning To Ramp RTRD Remote Tower Radar Display RTRD Retard RTRN Return RTRND Returned RTRNG Returning RTRNS Returns RTS Return to Service RTT Radio Teletypewriter RTU Radio Tuning Unit RTX Report Time Crossing RTZL Runway Touchdown Zone Light RUC Rapid Update Cycle RUF Rough RUFLY Roughly RUFORM Reference your form RULET Reference letter from your office RUMEMO Reference your memorandum RUMES Reference message from your office RURQN Reference requisition from your office RUT Standard regional route transmitting frequencies RUTEL Reference telegram from your office RUTWX Reference your TWX RV Radar Vector RV Rescue Vessel RVDT Rotary Voltage Differential Transmitter RVM Radar Video Map RVO Runway Visibility by Observer RVR Runway Visual Range RVRA Runway Visual Range (RVR) ten minute average RVRANO Runway Visual Range (RVR) ten minute average not available RVRENO Runway Visual Range (RVR) ten minute extremes not available RVRM Runway Visual Range (RVR) midpoint RVRMNO Runway Visual Range (RVR) midpoint not available RVRNO Runway Visual Range (RVR) not available RVRR Runway Visual Range (RVR) rollout RVRRNO Runway Visual Range (RVR) rollout not available RVRT Runway Visual Range (RVR) touchdown RVRTNO Runway Visual Range (RVR) touchdown not available RVS Revise RVSD Revised RVSG Revising RVSM Reduced Vertical Separation Minimums RVSS Revises RVV Runway Visibility Value RVVNO RVV not available RW Relative Wind RW Runway RWP Real-time Weather Processor RWR Radar Warning Receiver RWRC Remain Well to Right of Course RWSL Runway Status Lights RWY Runway RX Receiver RY Runway
