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SYSTEMS > Engines > Flashcards

Engines Flashcards

1
Q

NATOPS Chap 2

Engines

60R Engines

A

T700-GE-401C

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2
Q

NATOPS Chap 2

Engines

What type of Eng is the T700-GE-401C?

A

Front-drive turboshaft engine consisting of 5 sections: inlet, sompressor, combustor, turbine, exhaust.

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3
Q

NATOPS Chap 2

Engines

The engine incorporates

A

Integral waterwash manifold, IPS, Top-mounted accessory section, engine-driven fuel boost pump, HMU, EDECU, Self-contained lubrication system, Eng condition monitoring and diag provisions.

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4
Q

NATOPS Chap 2

Engines

The Engine Inlet Section includes:

A

Cowling, fairing, swirl frame, front frame, main frame, accessory section, and scroll case

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5
Q

NATOPS Chap 2

Engines

How does the air flow through the inlet?

A

Air passes through the inlet cowling (can be heated by 5th stage bleed air via inlet anti ice). The inlet fairing is also perforated with small slits to allow fifth stage bleed air to heat the exposed inlet surface for anti-icing puposes. Next, the intake airflow passes to the swirl vanes (impart rotation on the air and are hollow to permit passage of 5th stage bleed air fo anti-icing puposes)), the IPS, and then compressor/combustion

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6
Q

NATOPS Chap 2

Engines

How does the air flow through the IPS and onward?

A

Air from the swirl vanes throws particles outwards to the collection scroll. Particles are then dumped overboard via the blower assembly

From the IPS, clean air, free of foreign particles then passes through the deswirl vanes which provide smooth air to the compressor.

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7
Q

NATOPS Chap 2

Engines

What type of Compressor do we have?

A

5 stage axial and single stage centrifugal rotor/stator assembly

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8
Q

NATOPS Chap 2

Engines

Combustion Section Type and description

A

Flow-through annular combustion chamber with 2 igniters and 12 fuel injectors that receive fuel from the ODV, supplying atomized fuel for combustion

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9
Q

NATOPS Chap 2

Engines

What drives the Compressor and AGB?

A

The Ng turbine. It is a two- stage, air cooled, high performance axial design.

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10
Q

NATOPS Chap 2

Engines

How many stages does the Np turbine have?

A

2 stages that turn the turbine shaft

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11
Q

NATOPS Chap 2

Engines

What is the Np turbine shaft type and what is its relationship to Ng

A

The Np turbine hsaft is coaxial, and it turns inside of the Ng shaft

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12
Q

NATOPS Chap 2

Engines

What is the Np shaft connected to

A

The Np shaft extends through the front of the engine where it connects to the High speed shaft, which then turns the input mod.

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13
Q

NATOPS Chap 2

Engines

Where is TGT sensed

A

In between Ng and Np

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14
Q

NATOPS Chap 2

Engines

30% of Eng air is used for combustion.. what is the other 70% used for?

A

Compressor inlet Temp air (T2)
Compressor Discharge pressure air (P3)
Combustor and turbine cooling
Engine oil seal pressurization

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15
Q

NATOPS Chap 2

Engines

Where is the accessory frame mounted

A

mounts to the rear of the main frame at the 12 o’clock position above the scroll case

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16
Q

NATOPS Chap 2

Engines

How is the AGB driven and what is mounted on it?

A

The AGB is driven by a rotor via radial drive shaft from the Ng Turbine drive shaft.

The rear face of the AGB provides drive pads for the Engine Starter, HMU, IPS blower, and ODV. The fron face provides pads for the alternator and Engine driven fuel boost pump.

17
Q

NATOPS Chap 2

APU

The APU is…

A

“a gas turbine engine consisting of a power section, a reduction gearbox, appropriate controls, and accessories.”

18
Q

NATOPS Chap 2

APU

The APU accessory gearbox provides…

A

a mounting pad for the hyd starter and output driver for the APU fuel assembly, oil pump, and air-cooled ac gen.

19
Q

NATOPS Chap 2

APU

How is the APU lubricated?

A

via a self-contained oil system

20
Q

NATOPS Chap 2

APU

What is the APU fuel consumption rate?

A

150lbs/hr

21
Q

NATOPS Chap 2

APU

WARNING: Uncontained APU failure.

A

The APU does not incorporate a compressor or turbine wheel containment device. An uncontained APU failure may result in injury to ground personnel and/or damage to flight critical components including the tail rotor drive shaft

22
Q

NATOPS Chap 2

APU

What is the Prime/Boost Pump used to do?

A

It is used to prime the engine or APU fuel lines and provides fuel under pressure to the APU during starting and operations at pressure altitudes above 8000’

23
Q

NATOPS Chap 2

APU

What controls and monitors the APU and what does it do during the APU start??

A

the ESU/DESU (Electronic Sequence Unit/Digital Elect. Sequence Unit).

If the start sequence fails or a parameter is exceeded dur operation (with the exceptio nof APU OIL TEMP HI), the DESU/ESU will automatically shut down the APU

24
Q

NATOPS Chap 2

APU

What does APU FAIL indicate

A

The APU has failed due to High Ng, Low Ng, High TGT, Low TGT, Low oil pressure, or start sequence failure.

25
Q

NATOPS Chap 2

APU

What are the APU system accessories?

A

The accessories include a prime/boost pump, hydraulic accumulator (with hand pump), hydraulic starter, and ac generator.

26
Q

NATOPS Chap 2

APU

What is important to remember in order to retain the APU BIT codes?

A

In order to maintain BIT codes, dc power is required and the APU CTRL swith must remain in the ON postion.

27
Q

NATOPS Chap 2

APU

What does placing the APU CTRL switch to the On position iniitiate?

A

It initiates teh start sequence which causes the ESU/DESU to send a signal to open the APU start valve, releasing the hydraulic accumulator charge to the starter.

28
Q

NATOPS Chap 2

APU

What may you do if the APU does not start and the APU ACCUM LOW advisory and APU ACCUM LOW caution light are not illuminated?

A

A start may be attempted by simultaneously moving the APU CTRL switch to ON and actuating the manual START/OVERRIDE lever located on teh accumlator manifold. APU accumulator pressure will be dumped to the starter to turn the compressor until the APU has reached a self-sustaining speed

29
Q

NATOPS Chap 2

Engine Start, APU

Will the APU start the Engines regardless of the Air Source Position?

A

Yes. It will still provide pneumatic power for engine start regardless of the AIR SOURCE ECS/ START switch

30
Q

NATOPS Chap 2

Engine Start, Crossbleed

What happens when you press the starter switch with the Air Source switch in the Engine position?

A

It will simultaneously open the start valve on the receiving engine and the crossbleed valve on the donor engine.

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