2_BLEED AIR SYSTEM Flashcards
1
Q
What are the sources of bleed air
A
engines
aput
external air cart / source
2
Q
What systems does the bleed air system provide air for
A
ac / pressurization
wing / eng anti ice
engine start
hyd reservoir pressurization
water tank pressurization
3
Q
what stages is bleed air taken from
A
5th and 9th
5th - low press
9th - hi press
4
Q
Describe the engine bleed air valves
A
acts as a PRSOV
DC activated - pressure operated
5
Q
What happens to the engine bleed air valve when the bleed trip sensor activates?
A
its for press or temp
bav closes automatically
6
Q
Describe the bleed air duct pressure indicator and its power source
A
- duct pressure transmitters provide the indications for the indicator pointers
- the indicator is AC powered
- its ok to have differences between L and R duct pressure as long as there is sufficient air for pressurization
7
Q
Describe the isolation Valve
A
- isolates left and rt sides of bleed air duct
- Valve is AC operated
- in Auto the logic is
- if either eng bleed switch OR pack SWITCH is OFF - it opens
- it is NOT affected by the APU bleed air switch
8
Q
Describe the APU Bleed Air Valve
A
- allows apu bleed air to go the duct
- valve closes automatically when the APU is shut down
- DC controlled - pressure operated
9
Q
What causes a wing body overheat
A
bleed air duct leak
10
Q
A
