Equipment Cooling - Question Bank

Question 1

Equipment cooling provides air for what compartment/systems?

Answer 1

• Flight deck equipment

- Electrical and equipment racks (E&E)

Question 2

When is warm exhaust air ducted overboard through the ground exhaust valve?

Answer 2

• Engines not operating
• Equipment cooling selector in NORM
• Ambient temperature moderate or high

Question 3

When does the equipment cooling system configure for flight?

Answer 3

One or more engines on each wing is operating

Question 4

How can you manually configure the equipment cooling system for flight?

Answer 4

Equipment Cooling Selector to STBY

Question 5

Which valve is closed when equipment cooling is in closed loop mode?

Answer 5

Inboard exhaust valve

Question 6

What is the source of equipment cooling air for the flight deck electrical equipment?

Answer 6

-With two or three packs operating- the flight deck equipment cooling source valve directs conditioned air into the flight deck electrical equipment

Question 7

Describe the operation of the equipment cooling system with the Equipment Cooling Selector in OVRD.

Answer 7

• Provides equipment cooling in flight if internal fans are inoperative
• Internal fans are not powered.
• Smoke/override valve opens
• All other valves closed, no air flow to forward cargo
• Cabin differential pressure draws air from the panels area on the flight deck, through the equipment cooling ducts to the E&E, to create a reverse flow of air across the equipment, then through the supply duct overboard.

Question 8

Under what conditions would the equipment cooling system revert to closed loop mode?

Answer 8

• LLCCAFR selector in FWD LOW, BOTH LOW, FWD HIGH, with a forward lobe temp selector set < 10C (50F)
• If a single internal fan fails
• When the MAIN CARGO FIRE ARM switch is pushed