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Airplane question? Every time I watch a video of an airplane landing from the cockpit, I hear a voice that indicates there altitude. It always happens at the landing and it's the same voice. It says like "50, 40, 30..etc" so what is it?

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That would be the ground prox system on the aircraft it lets the flight crew know how far they are above the ground during an approach to the landing runway.

Posted on Jan 26, 2018

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