Engine Bleed Air

Question 1

What would cause a system fault light to illuminate?

Answer 1

• bleed air overheat
• bleed air overpressure
• HP bleed or PRV valves open when commanded closed

Question 2

What valves are closed when you place the engine bleed air switch to OFF?

Answer 2

• engine bleed air valve
• PRV
• HP bleed air valve

Question 3

Do you still have NAI and trust reversing with the engine bleed air switch OFF?

Answer 3

yes, unless the PRV is commanded closed by start valve open, bleed air overheat, or HP valve failed open

Question 4

Bleed Duct Leak L: How many switches will be involved?

Answer 4

5 or 6:

• left isolation valve
• engine bleed switch 1 & 2
• # 1 pack control selector
• # 1 demand pump switch
• WAI switch if in use

Question 5

Bleed Duct Leak L: What should be considered when configuring the airplane?

Answer 5

• Left LE will operate in secondary mode (“Flaps Primary” followed by “Flaps Drive” EICAS message until fully extended or retracted)
• slight asymmetry until fully extended or retracted

Question 6

Bleed Duct Leak L: What should be considered if aircraft has to be towed in?

Answer 6

Leave #1 engine running for hydraulics for steering