The two types of displaced thresholds are

• A. Permanent and Temporary
• B. Permanent and Provisional
• C. Temporary and Provisional
• D. Fixed and Movable

Answer: (A)

Displaced threshold is about how much runway can be used for landing versus takeoff and rollout. There are two ways a threshold can be displaced: permanently or temporarily. A permanent displaced threshold stays in place because of a fixed obstacle, runway design, or safety requirement; the threshold location is changed on a long-term basis and the markings reflect the new touchdown point, reducing the landing distance available. A temporary displaced threshold is used when the obstruction or condition is only short-term, such as during construction or a temporary blockage; temporary markings indicate the new threshold, and once the condition is resolved, the threshold returns to its original position and the landing distance is restored. The other terms aren’t standard categories for displaced thresholds, which is why the two correct types are permanent and temporary.