Air Systems Flashcards
What prevents debris from entering the CACs during normal ground operations and landings?
Deflector Doors
How many CACs operate when the APU is the only power source?
2: One on each side
What should be done to restore PACK operation when a PACK shuts down automatically?
Press the AIR CONDITIONING RESET switch.
A PACK operating in the Standby Cooling mode at low altitudes and high outside air temperature will:
Shut down
What provides cabin and flight deck ventilation if both packs are inoperative
The Alternate Ventilation System
What provides ventilation and conditioned air to the forward Cargo compartment?
Forward E/E cooling exhaust, a dedicated refrigeration unit, an inline electric heater and a forward cargo exhaust fan.
How can Bulk Cargo Heat be restored when automatic overheat shutdown occurs in flight?
It cannot be restored in flight.
What is the default altitude if cruise altitude is not available from the FMC and pressurization system operating in the automatic mode?
43,000
What protects the airplane fuselage from the excessive pressure differential?
Positive and negative pressure relief valves and vents
Where does hot bless air flow when the ENGINE ANTI-ICE selector is set to ON?
The engine core and inlet cowl
What cools the Large Motor Power Distribution System in the aft E/E compartment?
The Power Electronics Cooling system. PECS
In Cruise flight, and the pressurization in AUTO, what is the maximum cabin altitude?
No more than 6,000 feet.
What is the Integrated Cooling System? ICS
A centralized refrigeration system that provides cooling to galley carts and recirculated cabin air.
What happens to cabin altitude during unplanned level segments?
Cabin altitude remains constant as long as the airplane altitude is not changing.
In cruise, when the Humidification HUMID switch is in the on position, what happens?
The Flight Deck Humidification system operates automatically.
