Question:
Can anyone tell me the pneumatic power system supply requirements from engine start up, taxi, takeoff and landing + actions taken by crew to accomplish this ( for Boeing 747)
Can anyone answer down to component level, e.g. control surface movement, hydraulic pressurization, anti ice ect.. please don’t bother answering if you don’t have a clue, thanks…
Answers:
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Your question would take volumes to answer. In general, however, pneumatic power, in the form of bleed air from the engines and auxilliary power unit, is used for engine starting, pressurization and anti-icing/deicing.what is the age requirement to be a commercial airline pilot?
The normal mode is to use the APU for engine starting and cabin heating/cooling on the ground (if pre-conditioned air is not available). The APU is secured shortly after takeoff. Engine bleed air provides for cabin pressurization and anti-icing of engines, wings and tail.
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Control surfaces, landing gear, brakes and thrust reversers are all hydraulically operated.
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Most jet engines tap the air off of the high-compression side of the compressor, than through a diffuser or air condition unit for cabin air. I'm not sure for the 747 but I know for the 707-300 eng start is 40-60 psi and 20-60 for the rest. it is most likely automatic. the crew can shut off valves to isolate an engine. for the hydraulic system, the only pressurized system is 55 psi, the other two are electric. once again this is for a Boeing 707, but i would guess that 747 is similarMore Questions & Answers ...
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