Which statement about displaced thresholds is true regarding landing distance?

Which statement about displaced thresholds is true regarding landing distance?

• A. It reduces the landing distance
• B. It increases the landing distance
• C. No change to landing distance
• D. It eliminates the threshold altogether

Answer: (A)

Displaced thresholds move the point where you’re allowed to touch down forward along the runway. The portion before that threshold isn’t used for landing, though it can still be used for takeoff or rollout in the opposite direction. Because you must touch down beyond the displaced threshold, the distance from the threshold to the far end of the runway—the landing distance available—is shorter than the full runway length. So this arrangement reduces the landing distance available. The displaced portion isn’t eliminated entirely; it just isn’t used for touchdown.

Displaced thresholds move the point where you’re allowed to touch down forward along the runway. The portion before that threshold isn’t used for landing, though it can still be used for takeoff or rollout in the opposite direction. Because you must touch down beyond the displaced threshold, the distance from the threshold to the far end of the runway—the landing distance available—is shorter than the full runway length. So this arrangement reduces the landing distance available. The displaced portion isn’t eliminated entirely; it just isn’t used for touchdown.