Pneumatics

Question 1

The Pneumatic system is monitored and controlled by what?

Answer 1

2 BMCs (Bleed monitoring computers)

Question 2

If 1 BMC fails, can the other take over?

Answer 2

Yes, they are interconnected.

If 1 BMC fails:
APU and ENG 1 leak detection are not monitored
ECAM APU BLEED LEAK warning is lost

Question 3

What does the amber FAULT light in the APU BLEED pb indicate?

Answer 3

Bleed Leak (APU bleed valve closes)

Question 4

What causes the amber FAULT light on the ENG 1 BLEED and/or ENG 2 BLEED pb?

Answer 4

(OOLD)
-Overpressure
-Overheat
-Leak (low pressure)
-Discontinuity (APU bleed valve open and engine bleed valve not closed) OR
-Engine start with bleed valve not closed

Question 5

What are the 2 functions of the engine bleed valves?

Answer 5

Pressure regulation and Shut off valves

Question 6

What logic controls the X-Bleed valve when the X-Bleed switch is in AUTO?

Answer 6

APU Bleed open = X-bleed valve open
APU Bleed closed= X-bleed valve closed

X-bleed also closes for wing, pylon or APU duct leak (except during engine start)

Question 7

After engine start with the APU Bleed ON, what source is supplying bleed air to the packs?

Answer 7

APU Bleed