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Aircraft subsystem is a sub domain of the whole aircraft. Any system of the aircraft which helps the aircraft to be airborne (and fly safely) is called an Aircraft subsystem.

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The primary reason is availability -- the high pressure fuel pump is running whenever the engine is, while the airframe hydraulic systems may not be available in case of an accessory gearbox failure, …
answered Jan 30 '16 by UnrecognizedFallingObject