Pneumatic Flashcards
1
Q
HP and Bleed valve pressures
Under what pressure does bleed valve close?
A
HP valve: 36 ± 4
Bleed valve 45 ± 5
may reach 56 at high thrust
Under 8 PSI or return flow
2
Q
Under what conditions does the bleed valve close automatically?
A
- BLEED pb
- ENG FIRE pb
- High temp / pressure
- Leak
- Starter on
- No bleed consumers
3
Q
Precooler outlet temperature target?
When is overheat triggered?
A
200ºC
255-290ºC (time dependent)
4
Q
When X-bleed in AUTO, what happens with APU bleed?
A
X-bleed AUTO:
Shuts when APU bleed being used
- !!! Set to MAN before using APU BLEED for Pack 1 after ENG 2 Fail
5
Q
Why might the Engine # be amber?
A
N2 below idle
