TM 1-1510-225-10 B-8 OBS Omni Bearing Selector OFST Offset OM Outer Marker OROCA Off-Route Obstacle Clearance Altitude OSA Operational Support Aircraft OVHD Overhead OXY Oxygen PC Printed Circuit PFD Primary Flight Display PGM Program PITCH SYNC Pitch Synchronization PLT Pilot PNEU Pneumatic PNL Panel POS Position #PRESL Pre-Selected Altitude Profile Point PRESEL ALT Pre-Select Altitude PRN Pseudo Random Nose PROP Propeller PRESS, PRS Pressure PRV Previous PSI Per Square Inch PT Procedure Turn PTT Push To Talk PVT Private PWR Power R Right RAD Radial RAIM Receiver Autonomous Integrity Monitoring RCL Recall RCV Receiver RDO Radio REC Receiver RECOG Recognition REL Release REM, REM@ Remaining REQ FPM Require Feet Per Minute RES Reserve RMI Radio Magnetic Indicator RNAV Area Navigation RNG Range RPU Receiver Processor Unit RST Reset RT Receiver/Transmitter RW Runway S South SAT Static Air Temperature SBS Set Beginning Of Stack SDF Simplified Directional Facility SENS Sensitivity SF Special Function SHP Shaft Horsepower SID Standard Instrument Departure SMK Smoking SN, SNR Signal To Noise Ratio SPKR Speaker SQ Squelch STAR Standard Terminal Arrival Route STBY Standby STO Store SUA Special Use Airspace SUBPNL Subpanel SXTK Selected Crosstrack SYN Synchroscope SYNC Synchronization SYS System TACAN Tactical Air Navigation TAS True Air Speed TAT Total Air Temperature TBO Time Between Overhaul