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B747F Bleed Air System Questions and Answers
B747F Bleed Air System 
 
Under what conditions would High Pressure (HP) air be used? - Answer- During descent and other low power setting operations. 
 
Under what conditions would Intermediate Pressure (IP) air be used? - Answer- During high power setting operations. 
 
Which valves does the Engine Bleed Air Switches control by system logic when bleed air pressure is available? - Answer- Engine bleed air valve, the HP bleed valve and the PRV (pressure regulating valve). 
 
Describe the general...