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UH-60M Systems > Engines and Related Systems > Flashcards

Engines and Related Systems Flashcards

1
Q

How many sections is the engine divided into?

A

4
Hot
Cold
Accessory
Power Turbine

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2
Q

What is included in the cold section?

A

Inlet particle separator, the compressor, the output shaft and line replaceable units

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3
Q

How many stages does the compressor have?

A

6, 5 axial and 1 centrifugal

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4
Q

How many subassemblies are there in the hot section?

A

3
Gas generator turbine
Stage 1 nozzle assembly
Combustion liner

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5
Q

What sections does the power turbine have?

A

Two stage power turbine, exhaust frame, shaft and C sump assembly

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6
Q

What does the accessory section include?

A

accessory gear box, HMU, engine driven boost pump, oil filter, oil cooler, oil pressure sensor, fuel pressure sensor

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7
Q

What makes up the engine fuel system supply?

A

boost pump, fuel filter, fuel filter bypass, fuel pressure sensor, ODV

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8
Q

What are the two mechanical inputs from the cockpit to the HMU?

A

Load demand spindle and Power available spindle

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9
Q

What does the load demand spindle do?

A

Provides mechanical input from the collective output to the HMU to reduce transient engine and NR droop.

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10
Q

What does the sheer pin/roll pin in the LDS provide?

A

It prevents flight control jam in the event of a load demand malfunction. The pin will sheer causing the LDS to the HMU to drive fully aft and produce the most demand, may present as a torque split

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11
Q

What operates the Power Available Spindle in the HUM?

A

The engine power control levers

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12
Q

What does the ODV do?

A

Sends fuel to the fuel manifold for starting, acceleration, and engine operations.

It purges fuel

It will shut of fuel flow to prevent engine overspeed and hot starts

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13
Q

What does the engine alternator supply?

A

AC power to the ignition excited, DEC/EDECU, NG signal to the cockpit

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14
Q

What do the two bleed airports provide?

A

Cabin heating and air for crossbleed starts

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15
Q

What do the 2 sensors on the exhaust frame provide?

A

Power turbine governor and tachometer signal to DEC/EDEC

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16
Q

What does appearance of the INLET ANTI ICE advisory indicate above 13*C?

A

indicates a system malfunction

17
Q

What does the failure of the INLET ANTI ICE advisory below 4*C indicate?

A

System malfunction, do not fly the aircraft in known icing

18
Q

Due to engine bleed limits, what Q levels will inhibit inlet anti icing?

A

10% Q

19
Q

When will you see the ENG 1 OIL PRESS or ENG 2 OIL PRESS caution?

A

22 PSI or below

20
Q

What is the capacity of the oil tank?

A

7 qts

21
Q

How is oil cooled?

A

It passes through the oil cooler and transfers its heat to fuel. It then passes through scroll vanes, further cooling the oil and preparing the anti-ice system

22
Q

What are the 3 pneumatic sources for engine starts?

A

APU, crossbleed, ground source

23
Q

When should the engine starter on caution disappear?

A

Cutoff speed of 52-65% NG

24
Q

When will fuel flow automatically shut off?

A

If TGT reaches 900*C

25
Q

Can you start the engine with the ignition off?

A

No, but you can motor it

26
Q

What bias does the DEC incorporate?

A

-112*C

27
Q

What signals does the DEC provide to the cockpit?

A

NP1/NP2, Q, TGT

28
Q

What does hot start prevention do?

A

Prevents over temp during engine start or shut down

29
Q

When does HSP activate?

A

When NG < 60%, NP < 50%, TGT>900*C

30
Q

When does the DEC command the HMU to limit fuel?

A

Dual engine: 10 minute, 879*C +/- 9
Single engine: 2.5 minute, 903 +/- 10

31
Q

When will the DEC switch to contingency power?

A

When the opposite Q is less than 50% (engine failure or torque split)

32
Q

When is the NP overspeed protection tripped?

A

NP 120% +/- 1

33
Q

How do you know you have an EDECU installed?

A

25 on the TQ code

34
Q

For an engine with an EDECU, when will you get contignecy power?

A

NP drops below 96%
Greater than 3% droop between the reference and actual NP
Greater than 5% per second NP droop rate

35
Q

When will NG display on the power pod?

A

Either engine NG exceeds 100%
Difference between NG 1 and NG 2 is 5%
Either engine is out

36
Q

When does TGT display on the power pod?

A

Either engine exceeds 793C
Difference between TGT 1 and TGT 2 is greater than 75C
Either engine is out

37
Q

What happens when the DCU miscompares?

A

The parameter that has miscompared will turn black with a yellow background

UH-60M Systems (13 decks)

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