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747 ENGINE BLEED AIR QUESTIONS AND ANSWERS
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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 v...

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Document information

  • September 15, 2024
  • 1
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers

Subjects

  • 747 engine bleed air
  • what would cause a fault light to illuminate
  • when i place the engine bleed air switch to off w
  • bleed duct leak l how many switches will be invol

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  • 747 ENGINE BLEED AIR
  • 747 ENGINE BLEED AIR

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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 OPEN

Bleed Duct Leak L: how many switches will be involved? - Answer- 5 or 6
Left Isolation Valve
Engine Bleed switches 1 and 2
#1 Pack control selector
#1 Demand Pump switch
WAI switch (if in use)

Bleed duct leak L: what should be considered if the aircraft has to be towed in? -
Answer- Do not shutdown Eng #1 during tow for Hydraulics

Bleed Duct Leak L: what should be considered when configuring the airplane? -
Answer- Left LE will operate in Secondary mode
Primary Flat EICAS message

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