Technology on Instagram: "That grinding sound you hear before an A320 takes off is actually the plane’s auxiliary power unit (APU) coming to life. The APU is a small jet engine in the tail that provides electricity and pressurized air for systems like cabin air conditioning, avionics, and engine start—essentially powering the plane while it’s on the ground. The grinding or whirring noise comes from the mechanical components spooling up, and once the main engines start, the APU quiets down. It’s
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