Did you know that airplanes have a secret engine hidden in the tail? Known as the Auxiliary Power Unit or APU, it is us…

Did you know that airplanes have a secret engine h
Did you know that airplanes have a secret engine hidden in the tail? Known as the Auxiliary Power Unit or APU, it is usually run on ground during passenger boarding and deplaning, turning on an electric generator that powers both the electrical system and the air compressor for the cabin lights, flight-deck avionics (electronics), conditioning packs and to get the main motors started – all to provide an extra level of safety, convenience and comfort.
#MHDidYouKnow

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