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747 Engine Bleed Air Questions And Answers
747 ENGINE BLEED AIR 
 
What would cause a Fault light to illuminate? - Answer- Bleed Air overheat 
Bleed Air overpressure 
HP Bleed or PRV valve Open when commanded Closed 
 
When I place the Engine Bleed Air switch to OFF, what 3 valves close? - Answer- Engine Bleed Air valve 
PRV 
HP bleed air valve 
 
Do I still have NAI and Thrust reversing with the Engine Bleed air switches OFF? - Answer- Yes, unless the PRV is commanded Closed by Start Valve Open, Bleed Air overheat, or HP valve failed OP...