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M15 GTE > Power instilations > Flashcards

Power instilations Flashcards

1
Q

Where are engines installed

A

Inside the nacelle which gives aerodynamic smoothness and protects the engine components

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2
Q

What damage is allowed in the nacelle

A

Small dents , limitations found in the amm

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3
Q

What class are critical parts

A

Class 1 aerodynamic smoothness

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4
Q

How do we get undisturbed airflow around the pylon

A

By specially shaped covers called fairings

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5
Q

Air inlet cowling parts

A

Outer and inner barrel

Nose lip

Forward and aft bulkhead

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6
Q

How is air inlet cowling connected to engine flange

A

By bolts & there are two index pins

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7
Q

Why do some engines have unsymmetrical inlets

A

Use different air inlet cowlings on the left and right engine

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8
Q

How are cowlings supported

A

Single or dual telescopic hold open rods

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9
Q

Fan cowling latch angles

A

40-55

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10
Q

What does fan reverse cowling do

A

Guides fan airflow in either forward or reverse direction

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11
Q

How is cowling opened

A

Due to its weight it’s opened with assistance of hydraulic pressure from hydraulic hand pump

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12
Q

How do we prevent blade tip rub

A

The cowling forming a stiff case to support structural stability

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13
Q

How cowlings stiffened

A

V shaped grooves and blades

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14
Q

What causes tip rub

A

High aerodynamic loads

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15
Q

What are the two passive fire protection features

A

Fire protective coating & fire seal

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16
Q

What material is the fire seal

A

Titanium with heat resistant silicon layer

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17
Q

What does core cowling do

A

Covers the hot section of engine

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18
Q

How is the core cowling sometimes combined

A

With the fan reverser cowling

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19
Q

Exhaust nozzle components

A

Centre body & exhaust sleeve

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20
Q

What uses a reduced exhaust signature

A

High bypass fan engines

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21
Q

What material is the acoustic panel in low temperature areas

A

Lightweight composite

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22
Q

What material is the acoustic panel high temperature areas

A

Fibrous-metallic materials

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23
Q

When does pressure relive door open

A

Overpressure in compartment

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24
Q

How is the pressure relief door held in a closed position

A

By a spring

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25
Q

What are engines installed on

A

Pylon or engine strut

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26
Q

How many engine mounts is there

A

2 mounts

One fwd and one aft

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27
Q

What axis does engine weight act on

A

Vertical or z axis

28
Q

What axis does engine thrust work on

A

Longitudinal or rotational axis

29
Q

What mount is engine thrust transferred by

A

Only by fwd mount

30
Q

What axis do side loads act in

A

Lateral axis or y axis

31
Q

What do vibrational and flight manoeuvres do negatively

A

Generate additional loads in all directions

32
Q

What loads do attachments bolts carry

A

Vertical engine loads

33
Q

How are thrust and side loads transferred

A

Shear pins

34
Q

What direction does fwd engine mount transfer forces

A

Y and z , which are weight and side loads

35
Q

What loads do aft mount transfer

A

Only vertical loads

36
Q

How is vibration and torque effects reduced on turboprop instillation

A

Resilient rubber mounts and links

37
Q

When would the mount be rejected during inspection

A

If cracking or pitting is found

38
Q

During inspection if anything is found it’s rejected apart from what

A

Surface corrosion dependent on amm instructions

39
Q

How do you identify bayonet design

A

Three separate threads

40
Q

What’s the standard method for removing wing mounted engines

A

Bootstrap method

41
Q

What the good and bad about crane sling method

A

30% less time then bootstrap method but needs expensive equipment

42
Q

How can you identify crane supported sling method

A

G shaped arm

43
Q

Good and bad about uplifter loader method

A

40% less time then bootstrap but needs expensive special equipment

44
Q

How are control lever knobs shaped and coloured

A

Differently for identification purposes

45
Q

What’s the final adjustment and alignment of control system

A

Control rigging

46
Q

How are rigging pins fitted

A

With a red flag

47
Q

If the same travel is made by two levers linked together what happens with the angle

A

The angle between them and interconnecting rod must be the same

48
Q

When control rigging why do we carry out engine run

A

Power check and synchronisation

49
Q

Why do engines need a drain system

A

Take all leakages of fluid directly overboard

50
Q

2 Main components of drain system

A

Drain lines & module assembly

51
Q

Where is the drain mast and what does it do

A

Lowest part of module and it carries fuel overboard

52
Q

Where are fluid leaks collected from

A

All Drive pad seals on gear box

53
Q

Where are most drain outlets found

A

On pylon

54
Q

What’s the most important outlet do

A

Drains fuel overboard

55
Q

Why is it important to have outler drain

A

So fuel leak from the main fuel supply can’t collect in the pylon and drip into engine

56
Q

How do drain lines end

A

At drain mast with a specific hole

57
Q

How is leakage flow

A

Horizontal due to airstream

58
Q

What does horizontal leakage flow do

A

Provide visable track on drain mast so u can identify the origin of leak

59
Q

How do u check if leakage is acceptable or not

A

By checking leak rate

60
Q

What do you use for a leak rate check

A

Collect fuel in small plastic bottle and compare to limits in amm

61
Q

What does a drain collector assembly do

A

A method of checking leak rates

62
Q

What happens when leak collector is full

A

Overflow into holding tank

63
Q

Where are holding tanks emptied

A

By ram air that enters on front side of drain mast

64
Q

What airspeed are tanks pressurised

A

200kts

65
Q

How are collectors emptied manually

A

Spring loaded drain valves

66
Q

What are fire walls made of

A

Steel and titanium

M15 GTE (19 decks)

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