12 - Air Systems Flashcards
What tempreature can the engine reach if not sufficiently cooled
2200°C
What is the aceeptable range of engone cooling
800°C to 1150°C
What cools the combustion chamber lining
Secondary air passing through the engine
Where does secondary air come from
Low pressure compressor
What are the different zones and their numbers
- Fan case compartment (zone 1)
- IP compressor case compartment (zone 2)
- Core engine compartment (zone 3)
What tempreature can icing form
5°C
How are icing valves controlled
Automtically
What happens to air after it is used for anti-ice
Dcuted overboard
What % of primary air is diverted into the the combustion chamber for cooling
20% - 30%
Waht tempreature can turbine blades operate at
300°C to 400°C
What is the most common type of turbine cooling
Engine bleed air
How are accessories cooled
Ducted air from fan cowlings or certain compressor stages
What happens to the sealing air after it has been used
It is vented overboard through the hollow N1 shaft
What are the bleed air external services
- Cabin pressurisation, heating, and cooling
- De-icing/anti-icing
- Pneumatic starting of engines
- Auxiliary Drive Units (ADU)
