Systems: Pneumatics

Question 1

Describe the power sources of the pneumatic system

Answer 1

RECIRC- shed
PACK 1- DC
GASPER- DC
PACK 2- DC
XBLEED- essential
BLEED 1- essential
APU BLD- essential
BLEED 2- essential

Question 2

Describe the engine bleed logic.

Answer 2

Engine bleed air has priority over APU bleed air

ABV closes:
Left engine running and left EBV OPEN; or
Right engine running, right EBV open, and the cross-bleed open

Note: white line in button remains illuminated while button selected

Question 3

What is the pack valve operational logic (when do the packs shut down?)

Answer 3

Packs shut down for I GO PEPE
Icing
Go around
One engine
Pack overload
Essential power
Pack overheat
Engine start

Question 4

What controls the outflow valves?

Answer 4

CPAM: Cabin Pressure Acquisition Module opens and closes outflow valves for cabin altitude control, cabin climb rate, cabin differential pressure control