Aviator_Raza on Instagram: "When an airplane lowers its flaps, the sound you hear is a combination of mechanical movement and changing airflow, and it is completely normal. The flaps are large, heavy surfaces on the trailing edge of the wing, and they are moved by powerful hydraulic actuators or electric motors. As these actuators work, they create a deep whirring, humming, or grinding-like mechanical noise, similar to gears turning under load. Inside the wing, screw-jack mechanisms, gearboxes,

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