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CRJ900 Limitations, Systems > Pneumatic > Flashcards

Flashcards in Pneumatic Deck (15):
1

What is the primary bleed source for pneumatics on the ground

APU

2

If the HPV opens will the system continue to supply 6th stage air to the manifold

No, because of a check valve. The higher pressure air would try to flow into the 6th stage area without check valve

3

Which valves automatically close during engine start

Flow Control Valve(PAK valves)

4

Which valves open during engine start

1. Bleed isolation valve
2. APU LCV (optional)
3. Associated ATS valve (not controlled by ACSC)

5

What systems use bleed air

1. ECS
2. ATS
3. Anti-ice

6

What is used to detect leaks and overheats

Dual loop system and temp sensors in wings and pressure transducers

7

When will bleed source switch from APU to engines on ground

When anti-ice is activated

8

When taking off with APU on and anti-ice off when will bleeds switch to engines

When thrust is below TOGA, gear is up, flaps are less than 20*

9

On approach with the anti-ice off when will bleeds switch from APU back to the engines

Landing bit - gear down or flaps greater than 20*

10

What valves does the ACSC control

PRSOV, LCV, HPV, ISOL

11

Can the ISOL switch be opened or closed manually
PSM 19-20-1

Only when the BLEED VALVE switch is selected to manual

12

On the EICAS ECS synoptic page, what would it mean if the bleed pressure indication was Amber
PSM 19-20-2

Bleed pressure is high or low

13

When in manual mode does ISOL switch override the systems protective features

No

14

When in manual mode does the ISOL switch restrict automatic operation of the ISOL for engine start

No

15

What controls if the system uses 6th or 10th stage bleed air

ACSC