Exam (elaborations)
BOEING 747 BLEED AIR SYSTEM EXAM QUESTIONS AND ANSWERS
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BOEING 747 BLEED AIR SYSTEM EXAM QUESTIONS AND ANSWERS...
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Under what circumstances would HP air be used? - ANSWER - Descent- Low power setting operation
Under what circumstances would IP air be used? - ANSWER - Operation at
high power settings
What is the quantity controlled by system logic when bleed air pressure is
available on the Engine Bleed Air Switches? - 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 - To prevent damage to ducting and equipment downstream
To limit Bleed air pressure
How are the engine bleed air valves actuated and at what time do they open to
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
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