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Aircraft are equipped with instruments that measure the G-forces. That doesn't mean it detects gravity. Instead, these measure the forces on the aircraft, where 1 G Down is the normal weight of the aircraft. This information is recorded and stored on the aircraft and Flight Data Recorder so mechanics can determine if the aircraft experienced a hard landing or other heavy load.

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Why aircraft and planes are not attracted by the force of gravity?

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What force pulls an aircraft toward the ground acts against the force of lift in level flight?

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