EQUIPMENT COOLING Flashcards
Equipment cooling provides cooling air for what compartment/systems?
- Flight deck equipment
- Electrical and equipment racks (E & E)
Note:FCOM, VOL 2; 2.20.16
When is warm exhaust air ducted overboard through the ground exhaust valve?
- Engines not operating
- Equipment cooling selector in NORM
- Ambient temperature moderate or high
Note:FCOM, VOL 2; 2.20.16; 2.20.17
When does the equipment cooling system configure for flight?
• One or more engines on each wing is operating.
Note:FCOM, VOL 2; 2.20.17
How can you manually configure the equipment cooling system for flight?
• Positioning the Equipment Cooling Selector to STBY.
Note:FCOM, VOL 2; 2.20.17
Which valve is closed when equipment cooling is in closed loop mode?
• Inboard exhaust valve
Note:FCOM, VOL 2; 2.20.17
What is the source of equipment cooling air for the flight deck electrical equipment?
• With two or three packs operating, the flight deck equipment cooling source valve directs conditioned air into the flight deck electrical equipment.
Note:FCOM, VOL 2; 2.20.17
Describe the operation of the equipment cooling system with the Equipment Cooling Selector in OVRD.
- 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, then overboard.
Note:FCOM, VOL 2; 2.20.17
Under what conditions would the equipment cooling system revert to closed loop mode?
- LLCCAFR Selector in FWD LOW, BOTH LOW, FWD HIGH, with a forward lobe temp selector set lower than 10C (50F).
- If a single internal fan fails.
- When the MAIN CARGO FIRE ARM switch is pushed.
Note:FCOM, VOL 2; 2.20.17; 8.10.5
