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How does mode S identify each aircraft?

How does mode S identify each aircraft? Correct Answer Unique code for each transponder

Unlike the ATCRBS where a squawk code is dialed into the transponder, a mode S transponder has a unique identity permanently assigned to it. The mode S radar system can have more than 16 million different identities, enough for each airplane in the world to have a unique identity.

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Aircraft maintenance is the overhaul, repair, inspection or modification of an aircraft or aircraft component.