Which statements about a displaced threshold are correct?

• A. The threshold is moved when an obstacle penetrates the takeoff or approach path
• B. It is permissible to use this part of the runway for taxiing, takeoff and the landing rollout only
• C. You cannot land on the part of the runway that is marked with displaced threshold arrows
• D. All of the above

Answer: (D)

Displaced threshold exists to keep obstacle clearance on the approach and takeoff paths. The arrows show the portion of the runway that cannot be used for landing, while the area before that threshold remains available for other operations. That’s why the threshold is moved whenever an obstacle encroaches on the approach or takeoff path.

The threshold move described in the first statement reflects exactly this purpose: obstacles in the takeoff or approach path cause the threshold to be displaced to a safer location.

The area before the displaced threshold is not “lost” for all use. It can be used for taxiing and for the takeoff run. It’s also available for landing rollout, meaning aircraft can roll through that area after landing in the direction that uses the runway from the other end. This is why that portion is described as usable for taxiing, takeoff, and landing rollout.

And you cannot land on the part marked by the displaced-threshold arrows, which is specifically set aside to avoid landing on it.

So all the statements fit the rule for displaced thresholds, making all of them correct.