Atlas 747 Oral Rev. 2 - Engine Bleed Air Questions with correct Answers
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Atlas 747 Oral Rev. 2 - Engine Bleed Air
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Atlas 747 Oral Rev. 2 - Engine Bleed Air
Atlas 747 Oral Rev. 2 - Engine Bleed Air
The Engine Bleed Air Switches control which valves by system logic, when bleed air pressure is available? - Answer- Engine bleed air valve|PRV|HP bleed valve
Describe the general function of pressure regulating valve (PRV). - Answer- Prevents damage to...
Atlas 747 Oral Rev. 2 - Engine Bleed Air
The Engine Bleed Air Switches control which valves by system logic, when bleed air
pressure is available? - Answer- Engine bleed air valve|PRV|HP bleed valve
Describe the general function of pressure regulating valve (PRV). - Answer-
Prevents damage to ducting and equipment downstream, the PRV limits bleed air
pressure.
How are the engine bleed air valves actuated, and when do they open for forward
flow? - Answer- The bleed air valves are pressure actuated.|They 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
An Engine Bleed Air System (SYS) FAULT light indicates what? - Answer- Bleed air
overheat|Bleed air overpressure|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|The PRV remains closed|The engine bleed air valve remains
closed|Nacelle anti-ice and thrust reverse are not available for the respective engine
What two valves close in the engine if a bleed air overheat is detected? - Answer-
PRV|HP valve
What conditions in the engine bleed air system would prevent nacelle anti ice
operation when the bleed air switch is ON? - Answer- The PRV has failed closed, or|
The PRV has closed due to a bleed air overheat, or|The start valve is not closed
How would you isolate a bleed air duct section in the event of a bleed duct leak is
detected? - Answer- Close the respective isolation valve.|Close the engine bleed air
valves.
Do we normally operate with the Isolation Valves open or closed? - Answer- Open
If the center duct is isolated, how is temperature controlled in all temperature zones?
- Answer- All temperature zones operate in backup temperature control mode|Trim
air is unavailable
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