0001 00 TM 1-6625-724-13&P 0001 00-4 ACRONYM LIST MMI Man Machine Interface MMS Mast Mounted Sight MPD Multi-Parameter Display mV millivolt mV/g millivolt per Gravity N/A Not Applicable No. Number Nr Main Rotor Speed NSN National Stock Number N2 Power Turbine Speed OMI Operator Machine Interface OS Operating System OUTBD Outboard PAM Process Analysis Mode PC Personal Computer PCB printed circuit board PCL Pitch Change Link PHV Pilot Heel Vertical P/L Pitch Link PMCS Preventive Maintenance Checks and Services P/N Part Number PWA Printed Wiring Assembly PWR Power RADS-AT Rotor Analysis Diagnostic System-Advanced Technology RADSCOM RADS-AT Communication Program RAM Random Access Memory RDG Rapid Deployment Gear RDY Ready RPM Revolutions per Minute RTN Return 1/REV, 2/REV, 3/REV, etc. Once per revolution, Twice per revolution, etc. RX Receive SG Standard Landing Gear SI Smiths Industries SPS Signal Processing Systems, a division of Smiths Industries SPU Signal Processing Unit SSPA Synchronous Sampled Power Averaged Spectrum SSTA/SSTAR Synchronous Sampled Time Averaged Spectrum SW Switch T&B Track and Balance Tach Tachometer TACHO Tachometer TGT Target TRK Tracker UTD Universal Tracking Device Vac Volts alternating current