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UH-60L UH-60L FAMILIARIZATIONFAMILIARIZATION

CW3 RUBIO

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UH-60AUH-60A VS VS UH-60L UH-60L 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

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T700-GE-701CT700-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

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IMPROVED DURABILITY GEAR IMPROVED DURABILITY GEAR BOX (IDGB)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

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DIGITAL ELECTRONIC DIGITAL ELECTRONIC CONTROL (DEC)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

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DEC (Cont)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)

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DEC (Cont)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

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DEC (Cont)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

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DEC (Cont)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

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DEC (Cont)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

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DEC (Cont)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

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OVERSPEED DRAIN VALVE (ODV)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

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HISTORY COUNTERHISTORY 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)

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UH-60L OPERATING LIMITSUH-60L OPERATING LIMITSENGINE 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%

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UH-60L OPERATING LIMITSUH-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

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UH-60L OPERATING LIMITSUH-60L OPERATING LIMITSEngine 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

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UH-60L OPERATING LIMITSUH-60L OPERATING LIMITSTransmission Oil Temperature

Maximum 140° C

Precautionary 105-140° C

Continuous -50-105° C

Transmission Oil PressureMaximum 130 PSI

Precautionary 65-130 PSI

Continuous 30-65 PSI

Idle and Transient 20-30 PSI

Minimum 20 PSI

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EMERGENCY EMERGENCY PROCEDURESPROCEDURES

DEC LOCKOUT Single Engine Failure % Trq Split Between Engines 1 and 2

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PERFORMANCE PLANNINGPERFORMANCE 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)

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SUMMARYSUMMARY

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

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CONCLUSIONCONCLUSION

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.

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QUESTIONSQUESTIONS

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