Module 15.19 Powerplant installation

Question 1

What is a firewall?

Answer 1

Partition between the engine powerplant installation and the aircraft

Question 2

What is the purpose of a firewall?

Answer 2

Isolate the power plant from the engine structure

Question 3

What are firewalls typically made from?

Answer 3

CRES or high heat-resistant metal

Question 4

What are the zones an engine can be divided into?

Answer 4

• Fire zone
• Flammable fluid leakage zone
• Dry bay zone

Question 5

Fire zones as compartments that contain what?

Answer 5

• Ignition sources
• Potential for flammable fluid leakage

Question 6

What are the purposes of the cowlings?

Answer 6

• Protect the engine and accessories
• Provide streamlining

Question 7

What cowls are the thrust reversers located in?

Answer 7

C duct cowls

Question 8

What is the disadvantage of acoustic liners?

Answer 8

Addition of weight and increased fuel consumption

Question 9

The engine mounts must be designed to allow for what?

Answer 9

Radial and axial termal expansion

Question 10

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

Answer 10

Front and rear saddle beams

Question 11

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

Answer 11

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

Question 12

How are pylon mounted engines connected the pylon?

Answer 12

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

Question 13

What should be ensured for all lines?

Answer 13

That they do not chafe against things

Question 14

What should be avoided in flex lines?

Answer 14

Tight bends

Question 15

Where must looms not be routed?

Answer 15

Areas where they might be used as handholds or support

Question 16

How must wiring be clamped?

Answer 16

So that contact with equipment and structure is avoided

Question 17

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

Answer 17

Grommets and chafe strips

Question 18

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

Answer 18

High temperature equipment

Question 19

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

Answer 19

So the bundle will twist and not bend

Question 20

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

Answer 20

Ten

Question 21

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

Answer 21

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

Question 22

Control cables and rods are used to actuate what?

Answer 22

The fuel control unit

Question 23

What must be used when removing and replacing turbine engines?

Answer 23

Dedicated lifting points

Question 24

Inspection of the drains ensure what?

Answer 24

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

Question 25

What takes the fluids overboard?

Answer 25

Drain mast

Question 26

What assembly keeps the fluid leaks in small tanks?

Answer 26

Drain collector assembly

Question 27

Where do drain lines collect fluids and vapour?

Answer 27

Any point where lines and components may leak or where fluid can accumulate in cavities