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
0:12
Instagramits_technology_time18
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
The auxiliary power unit, or APU, is a small jet engine in the tail of an aircraft that provides power and pressurized air to the plane's systems, allowing it to operate while on the ground. The APU's grinding sound is caused by its mechanical components spooling up, but once the main engines start, it quiets down. The APU is a behind-the ...
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