the bit you are seeing at the end (the noisy bit) is the APU (auxiliary power unit). it is used to provide independent power on the ground which would usually come from a ground starter trolley or the main engines themselves. it is also used to start the engines. however, they arent switched on all the time.
there is no such thing as a stupid question! hope that helps!
Sam
Goff taught us well, didnt he?:D 😎 :rolleyes:
The APU, which is basically a turbine engine, will provide power for lighting, galley ovens power, air conditioning, and hydraulic pressure when the main engines are off.
Ive walked past a few parked up 747s at Heathrow and their APUs are very, very noisy.
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