What happens when engin - Study guides, Class notes & Summaries
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Atlas Air 747-400 Air System Questions and Answers
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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 val...
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