Boeing 747 Bleed Air System
Under what conditions would High Pressure (HP) air be used? - Answer- - Descent
- Low power setting operation
Under what conditions would Intermediate Pressure (IP) air be used? - Answer- - High power setting operations
Which values does the Engine Bleed Air Sw...
Boeing 747 Bleed Air System
Under what conditions would High Pressure (HP) air be used? - Answer- - Descent
- Low power setting operation
Under what conditions would Intermediate Pressure (IP) air be used? - Answer- -
High power setting operations
Which values does the Engine Bleed Air Switches control by system logic when
bleed air pressure is available? - Answer- - HP bleed valve
- PRV
- allows bleed air to open the respective engine bleed air valve and flow into the
bleed air duct
Describe the general function of the Pressure Regulating Valve (PRV)? - Answer- -
Prevents damage to ducting and equipment downstream
- Limits Bleed air pressure
How are the engine bleed air valves actuated, and when do they open for forward
flow? - Answer- - Bleed air valves are pressure actuated and remain closed until
engine bleed air pressure causes forward flow.
With the HP valve failed open and the respective bleed air switch OFF, will nacelle
anti-ice be available? - Answer- No
What does an Engine Bleed Air System (SYS) FAULT light indicate? - Answer- -
Bleed air overheat
- Bleed air over pressure
- HP bleed valve open when commanded closed
- PRV open when commanded closed
What does a bleed duct ISOLATION (ISLN) VALVE light indicate (amber)? - Answer-
Isolation valve position disagrees with switch position
What prevents reverse air flow into the engine compressor sections during engine
start? - Answer- The PRV is positively closed
What happens if the engine start valve fails to close? - Answer- - Bleed air is isolated
from the engine starter
- PRV remains closed
- Engine bleed air valve remains closed
- Nacelle anti-ice is not available
What two valves close in the engine if a bleed air overheat is detected? - Answer- -
PRV
- HP Valve
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