Atlas Air 747-400 Air System Questions and Answers
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Course
Atlas Air 747-400 Air System
Institution
Atlas Air 747-400 Air System
Atlas Air 747-400 Air System
What happens when Bleed Air switch is placed OFF - Answer- 1. Off light illuminated
2. Engine bleed air valve closed
3. Eicas >BLEED # OFF
4. PRV closed
5. HP Valved closed
Bleed Air switch OFF, Nacelle Anti-Ice switch on: - Answer- Unless non-normal condit...
Atlas Air 747-400 Air System
What happens when Bleed Air switch is placed OFF - Answer- 1. Off light illuminated
2. Engine bleed air valve closed
3. Eicas >BLEED # OFF
4. PRV closed
5. HP Valved closed
Bleed Air switch OFF, Nacelle Anti-Ice switch on: - Answer- Unless non-normal
condition has been detected, PRV closed position will be over ridden.
When will PRV not open for Nacelle Anti-ice or Thrust reversers - Answer- 1. PRV
failed closed or closed due to overheat
2. Start valve not closed
3. HP valve fails to open when NAI selected on
What happens when engine reaches 50% N2 - Answer- System logic closes the
engine bleed air valve and start valve
When do PRV and HP valves open? - Answer- Engine bleed air switch on and
adequate pressure for forward engine flow
What causes SYS FAULT light - Answer- H HP valve open when commanded closed
O overheat
O overpressure
P PRV open when commanded closed
To what altitude can APU provide bleed air? - Answer- 15,000 feet
Systems on left duct - Answer- Pack 1
left wing LE flaps
left wing anti-ice
HYD sys 1 air driven demand pump
Hyd head pressure 1&2
Systems on right duct - Answer- Pack 3
right wing LE flaps
right wing anti-ice
HYD sys 4 air driven demand pump
Hyd head pressure 3&4
Systems on center duct - Answer- 1. Cargo smoke detection
2. Aft cargo heat
3. Pack 2
4. Trim Air
5. Potable water pressure
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