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UH-60L FAMILIARIZATION

UH-60L FAMILIARIZATION. CW3 RUBIO. T700-GE-700 Main Transmission (28000 Series) ECU POU History Recorder. T700-GE-701C IDGB 38000 Series) DEC ODV History Counter Additional Nr & Coll Position Sensor for Droop Updated CDU & SDCs. UH-60A VS UH-60L.

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UH-60L FAMILIARIZATION

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  1. UH-60L FAMILIARIZATION CW3 RUBIO

  2. T700-GE-700 Main Transmission (28000 Series) ECU POU History Recorder T700-GE-701C IDGB 38000 Series) DEC ODV History Counter Additional Nr & Coll Position Sensor for Droop Updated CDU & SDCs UH-60A VS UH-60L

  3. T700-GE-701C • Compressor Rotor Assembly • Centrifugal Impeller & Rectangular Throat Diffuser • Compressor Rear Shaft/Gas Generator Shaft • Hot Section Module • Stage One Turbine Nozzle • Gas Generator Turbine Rotor • Gas Generator Stator • Power Turbine Module

  4. IMPROVED DURABILITY GEAR BOX (IDGB) • Major Improvements • New upper housing w/ mount for hyd pump • Tail T/O flange has larger pinion shaft • Provisions for rotor brake • Oil filler cap & dip stick more forward on G/B • All internal gears upgraded • IDGB mast shaft life increases 5-fold • Large increase in lube/scavenge volume flow • Breather ports installed on upper housing

  5. DIGITAL ELECTRONIC CONTROL (DEC) • DEC replaces ECU • Two power sources • Primary: Engine alternator • Secondary: 400 Hz, 120 Vac airframe power • Loss of alternator only results in loss of Ng signal & eng out audio and light (Airframe power causes no high side failure & no loss of Np or TQ indications

  6. DEC (Cont) • DEC Inputs • Engine alternator • Thermocouple harness • Np sensor • Torque & overspeed sensor • Torque signal from other engine • Collective stick position sensor (New- in mixing unit) • Nr sensor (New- on left accessory module) • Demand speed from engine trim switch • Feedback from HMU (Linear Variable Differential Transformer LDVT)

  7. DEC (Cont) • DEC Signals to Cockpit • Np • Torque • TGT • Signal fault validation • Validates input signals & DEC functions • If signal failure occurs, identified by fault code displayed on torque meter after engine shutdown

  8. DEC (Cont) • Hot Start Preventer • Prevent overtemps during start • Requires 400 Hz, 120 Vac for operation • Requires signals from Np sensor, Ng winding, & Thermocouple Harness (TGT) • HSP activates ODV shutting off fuel flow if: • Ng < 60% • Np < 50% • TGT >900° C

  9. DEC (Cont) • Transient Droop Improvement (TDI) • Engines more responsive • Signals required: • Nr (New on left accessory module) • Collective position sensor (New w/ 2 in mixing unit) • Engine torque signal • TDI is 4:1 over T700-GE-700

  10. DEC (Cont) • TGT Limiting • Dual engine limiting value: 866 + 6° C • Contingency power limiting value: 891 + 5° C • When other engine is inoperative • When torque on other engine is below 50% • Provides more power for single engine operation • DEC commands HMU to limit fuel flow • TGT limiting does not prevent overtemp during compressor stalls, engine starts, or LOCKOUT • Expect transient increases above limiting value when demanding max power

  11. DEC (Cont) • Np Overspeed Protection System • Primary electrical source is alternator. Secondary source is 400Hz airframe power. • Tripped when Np reaches 120 + 1% (25,000 rpm) • Requires input signal from Trq & Np overspeed sensor • When an overspeed is sensed, the Overspeed Relay activates solenoid in ODV and sends signal to Delay On Drop Out (DODO) circuit to turn on ignition • ODV shuts off fuel causing flameout (fuel returns to HMU) • When RPM drops below 120 + 1%, fuel returns to engine • When Overspeed Solenoid Valve closes, ignition comes on for 5 seconds for restart

  12. OVERSPEED DRAIN VALVE (ODV) • Replaces the POU • Mounted on the rear of accessory of engine • Houses 2 valves and the Overspeed Solenoid Valve • Three primary functions: • Sends main fuel to 12 nozzles (no start fuel system on 701C) • Purges fuel from main fuel manifold on shutdown • Np Overspeed Protection/Hot Start Preventer

  13. HISTORY COUNTER • Replaces History Recorder (not interchangeable) • Requires either alternator or 400Hz airframe power • All computations conducted in DEC • Provides permanent record of engine parameters • Engine operating hours-Begins when Ng > 50% • Low Cycle Fatigue (LCF), mechanical stress-Ng exceeds 95% after being >50% • (LCF) Thermal-Ng exceeds 95% after being >86% • Time Temp Index-TGT 90% of max cont (apprx 770°C) • Tracks many other items. Stored for 5 prev flights • Req inputs from Np, Ng, TGT (if any fail all stop)

  14. UH-60L OPERATING LIMITS ENGINE TORQUE 10-Second Transient Dual-Engine Above 80 KIAS 100%-144% 80 KIAS or below 120%-144% Single-Engine 135%-144% Maximum Continuous Single-Engine 0%-135% Dual-Engine Above 80 KIAS 0%-100% At or below 80 KIAS 0%-120%

  15. UH-60L OPERATING LIMITS TGT LIMITS 10-Second Transient 903º - 949º C 2.5-Minute Transient 878º - 903º C Start Abort Limit 851º C 10-Minute Limit 851º - 878º C 30-Minute 801º - 851º C Normal 0º - 810º C

  16. UH-60L OPERATING LIMITS Engine Oil Temperature Maximum 150° C 30-Minute Limit 135-150° C Continuous -50-135° C Engine Oil Pressure Maximum 120 PSI 5-Minute Limit 100-120 PSI Normal Operation 26-100 PSI Idle 22-26 PSI Minimum 22 PSI

  17. UH-60L OPERATING LIMITS Transmission Oil Temperature Maximum 140° C Precautionary 105-140° C Continuous -50-105° C Transmission Oil Pressure Maximum 130 PSI Precautionary 65-130 PSI Continuous 30-65 PSI Idle and Transient 20-30 PSI Minimum 20 PSI

  18. EMERGENCY PROCEDURES • DEC LOCKOUT • Single Engine Failure • % Trq Split Between Engines 1 and 2

  19. PERFORMANCE PLANNING • Maximum Torque Available-10 Minute Limit • Dual-Engine Torque Limits Above 80 KIAS (Helicopters prior to S/N 91-26354 not equipped w/ improved main rotor flight controls)

  20. SUMMARY • T700-GE-701C • Improved Durability Gearbox (IDGB) • Miscellaneous Aircraft Improvements • Operating Limitations • Emergency Procedures • Performance Planning

  21. CONCLUSION This class was not designed to create T700-GE-701C engineers, but to merely familiarize you with the UH-60L Model aircraft and to highlight the differences between the UH-60A and the UH-60L.

  22. QUESTIONS ?

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