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UH-60M Blackhawk - 2018 > Systems 2 - Engines > Flashcards

Systems 2 - Engines Flashcards

1
Q

There are two components to control the engines. The specific engine either has a _____ og an _____?

A

DEC , EDECU

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2
Q

DAS is short for?

A

Discrete Application Selection plug

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3
Q

Regarding the Tempaerature tape on the engine, _____ is good, ____ is bad

A

2 , 3

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4
Q

HMU is short for:

A

Hydro Mechanical Unit

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5
Q

PAS is short for:

A

Power Available Spindle

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6
Q

LDS is short for:

A

Load Demand spindle

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7
Q

What is the purpose of DEC/EDECU?

A

Limit the pilots load by:

(a) Maintaining a constant power turbine speed of 100%.
(b) Turbine Gas Temperature limiting, (limits the TGT to 879°C ± 9° or 903°C ± 10°)
(c) Load sharing (which keeps the torques of both engines matched within 5%),
(d) Power turbine overspeed protection (limits the power turbine speed to 120 ±1%)

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8
Q

HSP is short for? - And what does it do?

A

Hot start Preventer

Shuts down the engine in case of temperature getting to high during start up

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9
Q

What is the HMU?

A

A fuel control unit, controls fuel to the combustion system.

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10
Q

What is the funtion of the PAS?

A

The spindle changes linear cable movements into rotary inputs for the HMU

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11
Q

What is the function of the LDS?

A

This mechanical link between the collective and the HMU makes fuel-scheduling adjustments in a proactive attempt to match engine power to rotor load.

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12
Q

The function of Power takeoff drive assembly

A

The power takeoff drive assembly drives a radial drive shaft that mechanically links the accessory gear box and NG.

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13
Q

IGV is short for:

A

Inlet Guide Vane

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14
Q

What is the function of the IGV?

A

Control the amount of air entering the engine

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15
Q

VG is short for:

A

Variable Geometry

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16
Q

What is the function of the VG aid in acceleration and prevent compressor stalls VG?

A

Aids in acceleration and prevent compressor stalls.

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17
Q

IPS is short for:

A

Inlet Particle Separator

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18
Q

LRU is short for:

A

Line Replaceable Units

“Any part that can be removed and replaced at unit level maintenance (AVUM) with another like part like:”

(a) Oil filter
(b) Oil pump
(c) Liquid to liquid cooler
(d) Fuel filter
(e) Alternator

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19
Q

ODV is short for:

A

Overspeed Drain valve

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20
Q

What is the function of the ODV?

A

Controls the fuel flow into the engines.

Reacts by shutting of fuel flow during an overspeed or hot start

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21
Q

The ENG POWER CONT lever is mechanically linked to the _____ through a cable.

A

The ENG POWER CONT lever is mechanically linked to the Power Available Spindle (PAS) through a cable.

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22
Q

What is theEngine Inlet Temperature (T2) used for?

A

(1) T2 is used by the HMU to compensate for changes in air temperature.
(2) Inlet air temperature information from the T2 sensor is also used for NG limiting.

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23
Q

NG is short for:

A

Gas Generator Speed

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24
Q

NP is short for:

A

Power Turbine Speed

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25
Q

Q is short for:

A

Torque

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26
Q

What section of the engine mechanically drives NR?

A

NP section

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27
Q

Is the NG section mechanically connected to NP?

A

No

28
Q

What is the connection of NP and NR?

A

One-way mechanical connection via the freewheeling unit

29
Q

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

A

Cold, hot, power turbine, accessory gear box

30
Q

What drives the accessory gear box?

A

Gas Generator (at a variable speed)

31
Q

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

A

There are 6: 5 axial and 1 centrifugal

32
Q

What are the two operational sections of the engine?

A

NG and NP

33
Q

If flights of over six hours are made, engine oil level MUST be at the _____ of sight glass before flight.

A

Full Line

34
Q

How does engine oil cooling occur?

A

Liquid to liquid cooler, oil flow through the scroll vanes

35
Q

What is the service capacity for the engine oil?

A

7 quarts

36
Q

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

A

Sumps A and B

37
Q

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

A

Oil filter bypass valve, liquid to liquid cooler bypass valve

38
Q

3 important function of the DEC

A

TGT limiting

NP governing

Q load share

39
Q

How does the DEC decide which parameter is the limiting factor?

A

The limit that wants the least fuel (normaly the govenor)

40
Q

Where does the engine receive its electrical power?

A

Engine alternator

41
Q

How does the cockpit receive the NG signal?

A

From the NG winding of the alternator.

42
Q

If you go to lockout on the Pwr Cont Lever, what limiting do you lose?

A

Tgt limiting

NP governing

Q load share

43
Q

When in lockout what limits do you still have?

A

Np overspeed protection

Hot start prevention

44
Q

Green cables in the engine sends _____

A

Signals to the cockpit

45
Q

If NG signal is lost, what happens?

A

ENG OUT warning light and audio, and 0% NG.

46
Q

Why does the fuel system operate on negative pressure?

A

It assures that the airframe fuel supply system is under negative pressure, lessening the potential of fire in case of fuel system damage

47
Q

What happens when the fuel filter clogs?

A

Bypass indicator pops out, bypass valve opens

48
Q

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

A

The LDS increases/decreases fuel flow

49
Q

How is engine power adjusted with the PCLs in lockout?

A

Adjustment of the engine power control levers adjusts the PAS to set the maximum power available

50
Q

Is the APU capable of starting both engines simultaneously?

A

Yes, within certain ambient temperature ranges

51
Q

At what NG should the starter caution disappear?

A

52-65% NG

52
Q

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

A

90% and above

53
Q

How do you manually disengaged the starter?

A

You must pull down on the PCL to disengage the starter

54
Q

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

A

Yes, it is also supplied from the AC airframe power

55
Q

What does the HSP automatically prevent?

A

It prevents over temperature during engine starts by shutting down the engine

56
Q

What system keeps the engines at an approximate equal torque?

A

The torque matching/load sharing system

57
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.

58
Q

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

A

4°C to 13°C it may or may not activate, <4°C it must activate

59
Q

With engine anti ice activated how much should maximum Q available be reduced?

A

-20%. With cockpit gunner heater on reduce another 5%

60
Q

What do you do if you encounter a single engine failure during flight?

A

Collective — Adjust to maintain NR

External cargo/stores — Jettison (if required).

Establish single-engine airspeed.

If continued flight is not possible

LAND AS SOON AS POSSIBLE

If continued flight is possible:

LAND AS SOON AS PRACTICABLE

61
Q

How do you recognize an engine compressor stall?

A

A loud banging or popping accompanied by rapid increase in TGT and fluctuations in NG, Q, and NP

62
Q

Engine start abort criteria:

A
  • No TGT increase (light off) within 45 sec
  • No P (eng oil pressure) within 45 sec
  • No NP1 or NP2 within 45 seconds (if rotor brake is off)
  • ENG STARTER ON caution disappears before reaching 52% NG.
  • TGT reaches 851°C before idle is attained (above 63% NG).
63
Q

CAUTION: If start is attempted with ENGINE IGNITION switch _____, do not place switch to _____. Abort the start.

A

OFF , ON

64
Q

When turning the engine Inlet anti ice on, at _____ degrees the the anti ice must turn on.

Between _____ degrees and ______, it might turn on or might not.

Over _____ degrees, it must stay off.

A

When turning the engine Inlet anti ice on, at 4*C the the anti ice must turn on.

Between 4*C degrees and 13*C, it might turn on or might not.

Over 13*C degrees, it must stay off.

65
Q

UES is short for

A

Upturned Exhaust system

66
Q

Eng anti ice is required to be off above ____% and on below _____ %

A

92% , 88%

UH-60M Blackhawk - 2018 (20 decks)

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