Answer :

Final answer:

A displaced runway threshold is a spot on the runway farther down from the regular threshold and is used when a portion of the runway is not suitable for landing. It modifies the straight-line distance or 'displacement' for landing, but not the total length or 'distance' of the runway.

Explanation:

A displaced runway threshold differs from a regular runway threshold in that it is a designated point on the runway, usually marked by white lines or arrows, which indicates where an aircraft should start its final descent in order to land safely. Unlike a regular threshold, a displaced threshold is set farther down the runway and is used when a part of the runway is unsuitable for landing, for example, due to obstructions, specific noise abatement procedures, or damage.

It's similar to the difference between distance and displacement. Distance would be the length of the entire runway, while displacement would be the straight-line distance from the starting point (where the aircraft touches down) to the endpoint (end of the runway). The total distance is unchanged, but the displacement (the usable distance for landing) is different when a displaced threshold is implemented.

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