What is the effect of a displaced threshold on runway length?

What is the effect of a displaced threshold on runway length?

• A. It increases runway length for landings.
• B. It reduces the length of runway available for landings.
• C. It has no effect on landing distance.
• D. It increases takeoff distance only.

Answer: (B)

A displaced threshold shifts the landing start point down the runway, so the portion of pavement before that point isn’t used for landings. For landing operations, you touchdown beyond the displaced threshold, which means the landing distance available is shortened compared to the full runway length. The area before the displaced threshold can still be used for takeoffs (and for taxiing or other uses), but it isn’t counted in the landing distance. So the effect is a reduced distance available for landings.

A displaced threshold shifts the landing start point down the runway, so the portion of pavement before that point isn’t used for landings. For landing operations, you touchdown beyond the displaced threshold, which means the landing distance available is shortened compared to the full runway length. The area before the displaced threshold can still be used for takeoffs (and for taxiing or other uses), but it isn’t counted in the landing distance. So the effect is a reduced distance available for landings.