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UH60A/L Systems > Powerplant > Flashcards

Powerplant Flashcards

1
Q

What are the positions on the PCL?

A

OFF, IDLE, FLY, LOCKOUT

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2
Q

What does HMU stand for?

A

Hydromechanical Unit

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3
Q

What section of the engine mechanically drives RPM R?

A

Np section

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4
Q

How is the Ng section connected to Np?

A

By (expanding, burning) gasses. (Not mechanically)

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5
Q

What is the connection between Np and RPM R?

A

One-way mechanical connection, via the free-wheeling unit

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6
Q

Name the four modules of the T700-GE-701D/CC engine

A

COLD, HOT, power turbine, accessory gear box

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7
Q

What drives the accessory gear box?

A

Gas generator (Ng, at variable speed)

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8
Q

How many stages are there in the compressor section (Ng)?

A

6: 5 axial, 1 centrifugal

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9
Q

What are the two operational sections of the engine?

A

Ng and Np

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10
Q

How does the engine oil cooling occur?

A

Liquid to Liquid cooler and oil flow through scroll vanes.

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11
Q

What is the service capacity for the engine oil?

A

7 quarts

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12
Q

Where is the oil drawn from for the emergency oil system?

A

Sumps A and B

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13
Q

How does the oil system overcome high pressure during cold starts?

A

Oil filter bypass valve, liquid to liquid cooler bypass valve.

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14
Q

Which component provides electrical power to the engine?

A

Engine alternator

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15
Q

How does the cockpit receive the Ng signal?

A

From the Ng winding of the alternator

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16
Q

What happens if Ng signal is lost?

A

ENG OUT warning light and audio 0% Ng read out on the PDU

17
Q

Why does the fuel system operate on negative pressure?

A

It lessens the potential of fire in case of fuel system damage, by assuring that the airframe fuel supply system is under negative pressure.

18
Q

What happens when the fuel filter clogs?

A

Bypass indicator pops out, and the bypass valve opens.

19
Q

How does the engine compensate for variable power demands from collective inputs?

A

The LDS (Load Demand system) increases/decreases fuel flow

20
Q

How is engine power adjusted with the ENG POWER CONT levers in lockout?

A

Adjustment of the EPCLs adjusts the PAS (Power Available Spindle) to set the maximum power available.

21
Q

What is LDS an acronym for?

A

Load Demand System

22
Q

What is DEC an acronym for?

A

Digital Electronic Control

23
Q

Is the APU capable of starting both engines simultaneously?

A

Yes, with certain ambient temperature ranges. (Not recommended)

24
Q

At what Ng should the starter caution disappear?

A

52-65% Ng

25
Q

With one engine operating, what Ng must be maintained to crossbleed start the other?

A

≥ 90%

26
Q

How do you normally disengage the starter?

A

Pull down on the EPCL to disengage starter.

27
Q

If alternator power is lost to the engine, will the DEC/EDECU still remain functional?

A

Yes, it is also supplied from the AC airframe power

28
Q

What does the HSP automatically prevent?

A

Over-temperature during engine starts by shutting down the engine.

29
Q

What system keeps the engines at an approximate equal torque?

A

Torque matching/load sharing system

30
Q

Other than bleed air, what is used to assist in engine anti-ice functions?

A

The hot engine oil also provides a passive anti-ice function.

31
Q

The engine inlet anti-ice automatically activates between what temperature ranges?

A

4 to 13 degrees Celcius may or may not activate above 4 degrees it must activate

32
Q

701D/CC with engine anti-ice activated, how much should maximum %TRQ available be reduced?

A

18%, with cockpit gunner heater on reduce further 4%

33
Q

What is the purpose of the HIRSS system?

A

To reduce line of sight heat signature of the hot engine surfaces.

34
Q

How do you recognize an engine compressor stall?

A

Noticeable bang or popping noise and possible helicopter yaw.

35
Q

How many SHP does the T700-GE-701D/CC Engine produce?

A

1760

36
Q

What are the functions of the HMU?

A
  • Controls fuel to the combustion section - Contains a high pressure valve that delivers fuel to the Overspeed and Drain Valve (ODV)
37
Q

The load demand system supplies what?

A

A mechanical and electrical signal to the load demand spindle on the engine HMU fuel control through a push pull control.

UH60A/L Systems (9 decks)

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