15.12

Question 1

Zone cooling

Answer 1

Zone 1
- the area around the fan case.
- vented by ram air. Inlet tube on nose cowl normally on the top, exhausted on the lower end back into fan air stream.

Zone 2
- cooled by fan air

Zone 3
- the area around the high pressure compressor to the turbine cases
- zone contains fuel + oil lines.

Question 2

Engine anti icing control

Answer 2

During flight anti-icing is normally automatically controlled or by a switch in the cockpit.

Question 3

Internal cooling.

Answer 3

Compressor cooling
- rear stages of the compressor is 350-400 degrees c
- the compressor rotor cavity is cooled by IP compressor stage.

Combustion chamber cooling.

Question 4

Sealing with air

Answer 4

Bearing chamber seal
LP compressor bleed air used
Prevents oil escaping out
Vents overboard through N1