A displaced threshold is located at a point on the runway other than the designated beginning. Which statement best describes this?

• A. It is a threshold located at the normal runway beginning.
• B. It is a threshold located at a point on the runway other than the designated beginning.
• C. It has no effect on landing distance.
• D. It is used only for takeoffs.

Answer: (B)

A displaced threshold means the landing threshold is moved away from the very start of the runway, to a point farther down the pavement. The effect is that landings must occur beyond that displaced point, so the available landing distance is reduced by the amount the threshold is moved. The portion of runway before the displaced threshold can be used for takeoff or taxi, but not for landing. In other words, the threshold is located at a point on the runway other than the designated beginning, which is exactly what this statement describes. This also explains why the area before the threshold isn’t available for landing and helps ensure obstacle clearance or other operational needs.