Which option is NOT a typical reason for a displaced threshold?

Which option is NOT a typical reason for a displaced threshold?

• A. To shorten landing distance due to obstructions, noise abatement, or safety area requirements.
• B. To provide dedicated taxiway path for large aircraft.
• C. To accommodate noise abatement goals.
• D. To provide safety area dimensions.

Answer: (B)

Displaced thresholds are placed to ensure safe landings given obstacles, safety area requirements, or noise abatement goals. Moving the landing threshold down the runway changes where touch-down can occur, so the approach can meet obstacle clearance and safety criteria or reduce noise impacts. The area before the displaced threshold may still be used for takeoff or taxi operations, but it isn’t counted as part of the landing distance. Providing a dedicated taxiway path for large aircraft isn’t a reason to displacement a threshold. That kind of ground movement routing is handled by taxiway design and runway access planning, not by shifting the point where landing begins. So, the option describing a dedicated taxiway path for large aircraft is not a typical reason for a displaced threshold.

Displaced thresholds are placed to ensure safe landings given obstacles, safety area requirements, or noise abatement goals. Moving the landing threshold down the runway changes where touch-down can occur, so the approach can meet obstacle clearance and safety criteria or reduce noise impacts. The area before the displaced threshold may still be used for takeoff or taxi operations, but it isn’t counted as part of the landing distance.

Providing a dedicated taxiway path for large aircraft isn’t a reason to displacement a threshold. That kind of ground movement routing is handled by taxiway design and runway access planning, not by shifting the point where landing begins. So, the option describing a dedicated taxiway path for large aircraft is not a typical reason for a displaced threshold.