Discussion
Bleed air taken from the engine compressor is used principally for
Answer: A
Correct answer: Pressurisation and anti-icing
Bleed air is hot compressed air tapped from the compressor, and its two principal uses are cabin pressurisation and air conditioning, and anti-icing of the wing leading edges and engine inlets. Both need air that is already hot and at pressure, which is exactly what the compressor delivers.
Generators, fuel pumps and hydraulic pumps are driven mechanically from the accessory gearbox instead. Bleed is not free: the air has had work done on it, so extracting it costs thrust - which is why bleedless architectures have appeared.
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