PREVIEW

... core is a small turbine engine. It is a power unit other than the aircraft's main engine. It is used to independently provide power and compressed air to the aircraft. There are also some apus that can provide additional thrust.

Generally speaking, before the aircraft takes off, the apu provides the aircraft with the power and gas source to start the main engine; during take-off, it can ensure that the main engine power is used for acceleration and climb to improve take-off performance; d ...

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