Chapter 2 - Air Systems

Question 1

1. Bleed air is used in what systems?

Answer 1

PAWS HAD PALT

a. Pressurization
b. Air conditioning
c. Wing and engine anti-ice
d. Start engine
e. Hydraulic reservoir pressurization
f. Aft cargo heat
g. Detection Cargo smoke
h. Potable water tank pressurization
i. Air driven hydraulic demand pumps
j. Leading edge flaps
k. Thrust reversers (AOM 2-34)

Question 2

2. Can the APU provide bleed air in flight? Up to what altitude?

Answer 2

a. Yes for one pack up to 15,000ft (AOM-7-36)

Question 3

3. Turning an Engine Bleed air switch off does what?

Answer 3

a. Closes the engine bleed air valve, PRV, and HP bleed valve. (AOM 2-13)

Question 4

4. If the switch is OFF is NAC anti-icing available for that engine?

Answer 4

a. Yes. (except when the PRV has failed closed, or the PRV has been closed due to a bleed air overheat, or the start valve is not closed, or the HP bleed valve is failed open) (AOM 2-35)

Question 5

5. What will illuminate the SYS Fault light?

Answer 5

Bleed air overheat
Bleed air over pressure
HP or PRV valve open when command close (AOM 2-12)

Question 6

6. With the light (SYS) FAULT illuminated, is reversing available on landing?

Answer 6

a. Not if light is on due to an overheat (AOM 2-35)

Question 7

7. What unit in the bleed air system reduces bleed air temperature?

Answer 7

a. Fan Air Pre-Cooler (AOM 2-34)

Question 8

8. With a BLD 1,2,3,4 OVHT/PRV, what systems are no longer available?

Answer 8

a. Nacelle Anti-Ice

b. Reverse Thrust (QRH 2-3)

Question 9

9. APU bleed air is supplied to which duct?

Answer 9

a. Center section of the bleed air duct (AOM 2-35)

Question 10

10. Where is duct pressure displayed?

Answer 10

a. Primary EICAS and ECS Synoptic (AOM 2-15)