15.9 PWERPLANT ASSEMBLY👌🏼

Question 1

What is a firewall

Answer 1

Partition between engine powerplant installation and the aircraft

Question 2

Firewall function

Answer 2

Isolate powerplant from airframe structure in case of fire and heat

Question 3

What are firewalls typically made out of

Answer 3

Stainless steel

Question 4

Why do engine pods incorporate zones

Answer 4

• to minimise the probability of a fire and to isolate a fire

Question 5

What is the function of a fire blanket

Answer 5

Protect against a fire or overheating

Question 6

Compartments that contain ignition sources and the potential for flammable fluid leakage are classified as

Answer 6

Fire zones

Question 7

Why are firewalls used in helicopters

Answer 7

To ensure engine is separated from adjacent engine or main gearbox

Question 8

Why are fan and reverser cowls attached to the engine

Answer 8

-Protect engine and its accessories from environment
- streamlined surface

Question 9

Where is the cowling attached to

Answer 9

Nacelle support frame

Question 10

How is the cowling secured

Answer 10

• several latches along 6 o’clock centreline

Question 11

How can the hinged cowl be opened and closed

Answer 11

• hand
• electrical pump

Question 12

What are the thrust reverser cowls commonly referred as

Answer 12

C duct

Question 13

Explain acoustic panels

Answer 13

• noise absorbent liners around inside wall

Question 14

What is the disadvantage of using acoustic liners

Answer 14

• weight and increased fuel consumption due to friction increase

Question 15

Why mustmountings be designed to allow expansion in radial and axial directions

Answer 15

Allow for thermal expansion

Question 16

On side mounted engines, the front and rear saddle type beams are connected through

Answer 16

Fillets to the airframe

Question 17

How are the beams connected to the engine mounting points

Answer 17

Swinging links
Thrust trunnions
Thrust strut connected to air frame

Question 18

Where must wire bundles be routed

Answer 18

• accessible areas that are protected from damage and maintenance activity

Question 19

What is the minimum radii for bends in wire groups or bundles

Answer 19

> =10 times of outside diameter of the largest wire

Question 20

When removing or replacing turbine engines, what is used to raise and lower engine

Answer 20

• lifting points

Question 21

Why do we use lifting points

Answer 21

To safely lift the weight of the engine

Question 22

What are the main components of a drain system

Answer 22

• drain lines (which collect fluids)
• module assembly (where drain line ends)

Question 23

What does the lower part of the module assembly consist of

Answer 23

Drain mast which takes fluid overboard

Question 24

Explain drain collector assembly (manifold module)

Answer 24

• assembly that keeps fluid leaks in small tanks