Module 15.19 Powerplant installation Flashcards

1
Q

What is a firewall?

A

Partition between the engine powerplant installation and the aircraft

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2
Q

What is the purpose of a firewall?

A

Isolate the power plant from the engine structure

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3
Q

What are firewalls typically made from?

A

CRES or high heat-resistant metal

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4
Q

What are the zones an engine can be divided into?

A
  • Fire zone
  • Flammable fluid leakage zone
  • Dry bay zone
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5
Q

Fire zones as compartments that contain what?

A
  • Ignition sources
  • Potential for flammable fluid leakage
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6
Q

What are the purposes of the cowlings?

A
  • Protect the engine and accessories
  • Provide streamlining
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7
Q

What cowls are the thrust reversers located in?

A

C duct cowls

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8
Q

What is the disadvantage of acoustic liners?

A

Addition of weight and increased fuel consumption

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9
Q

The engine mounts must be designed to allow for what?

A

Radial and axial termal expansion

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10
Q

On side mounted engines what beams connect the engine to the fuselage?

A

Front and rear saddle beams

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11
Q

On side mounted engines, how are the beams connected to the engine mounting points?

A

Swinging links and thrust trunnions, with a thrust strut connected to the airframe

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12
Q

How are pylon mounted engines connected the pylon?

A

Front and rear brackets attached to links at the top front and rear of the engine

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13
Q

What should be ensured for all lines?

A

That they do not chafe against things

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14
Q

What should be avoided in flex lines?

A

Tight bends

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15
Q

Where must looms not be routed?

A

Areas where they might be used as handholds or support

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16
Q

How must wiring be clamped?

A

So that contact with equipment and structure is avoided

17
Q

What extra protection can be given to bundles if contact can’t be avoided?

A

Grommets and chafe strips

18
Q

To prevent insulation degradation wiring must be routed away from what?

A

High temperature equipment

19
Q

Wiring routed across hinged panels must be routed and clamped how?

A

So the bundle will twist and not bend

20
Q

The minimum bend radii must not be less than __ times the outside diameter of their largest wire.

21
Q

When can bundles be bent at 6x their outside diameters?

A

At breakouts or when they must reverse direction, if they are suitably supported

22
Q

Control cables and rods are used to actuate what?

A

The fuel control unit

23
Q

What must be used when removing and replacing turbine engines?

A

Dedicated lifting points

24
Q

Inspection of the drains ensure what?

A

Open and clear. Gives the engineer indication of where the fluid is from

25
What takes the fluids overboard?
Drain mast
26
What assembly keeps the fluid leaks in small tanks?
Drain collector assembly
27
Where do drain lines collect fluids and vapour?
Any point where lines and components may leak or where fluid can accumulate in cavities