UH-60A System Acronyms Mechanical Mixing Collective to Pitch - Collective to Roll Collective to YawYaw to Pitch - Compensates for rotor downwash on stabilator. Increase collective – disk tilts forward. Compensates for translating tendency. Increase collective – disk tilts left. Compensates for torque. Increased collective – T/R thrust increased. Compensates for 2.5% lift of T/R. Increase left pedal – disk tilts aft. Functions of the Stabilator (SCALP) S - Streamlines with rotor downwash @ A/S < 30 Knots C – Collective Coupling; Increased collective stabilator programs down. A - Angle of incidence decrease as airspeed increases. L - Lateral excursions (side-slip to pitch coupling); in slip/skid rotor downwash differs with nose right/left. P - Pitch rate feedback: Turbulance or wind gust – nose up – stabilator down, nose down – stabilator up. Weight on Wheel (WOW) Switch (ITABUSCHE) I - IFF mode 4 – zeroize disabled in flight, auto code hold before 1st takeoff. T - Thermal protection for BACKUP PUMP on the ground. A - Audio for low RPM R disabled on the ground B - BACKUP PUMP in auto regardless of switch position in flight. U - Underfrequency protection disabled in flight. S - SAS/FPS computer degraded on the ground. C - Chaff dispense disabled on the ground. H - Hydraulic leak test disabled in flight. E - ESSS jettison disabled on the ground. UH-60A System Acronyms Engine Alternator (INE) I - Igniter Power N - Ng signal to cockpit E - ECU Power ECU Functions (NOT THIS) N - Np reference from cockpit (96-100%) O - Overspeed (Np) protection (1061%) redundant from AC primary buses. T - Torque matching/load sharing within 5%. T - TGT limiting @ 837-849ºC H - History recorder signals. I - Isochronous Np governing. S - Signals to cockpit for Np and Torque. HMU Functions (PM CAN VETO) P - Pumps fuel M - Meters fuel. C - Collective coupling through LDS. A - Accel./decel. Fuel flow limiting. N - Ng limiting V - Variable Geometry positioning. E - Engine power control through PAS (lockout) T - Torque motor interface with ECU (trims Ng). O - Opens vapor vents for bleed air and fuel prime. POU Functions (MOPS) M - Main fuel sequencing O - Overspeed protection (Np) with signal from ECU P - Purges start & main fuel manifolds. S - Start fuel sequencing UH-60A System Acronyms Fuel Flow in the Engine (Path Finders Have Little Potential) P - Pump (Engine drive fuel pump) F - Fuel Filter H - HMU L - Liquid to Liquid cooler P - POU GCU Functions (UFOVU) U - Underfrequency protection (95% Nr on the ground 8589% Nr in flight). F - Feeder Fault Protection (Short Isolation/Circuit Protection) O - Overvoltage Protection. V - Voltage Regulation. U - Undervoltage Protection Less than 60 AXIS More than 60 Attitude Hold P Attitude Hold – A/S Hold Attitude hold R Attitude Hold Heading Hold Y Heading Hold or Turn Coordination 5 Lights which should be accompanied by the Backup Pump Advisory Light R - #1 RES LOW H - #1 HYD PUMP (Roy Has To Hurry Away) T - #1 T/R SERVO H - #2 HYD PUMP A - APU ACCUM LOW 3 30 Minute Limits TGT NG Temp - Oil