What is the distance of the Approach Surface from the primary surface?

The distance of the Approach Surface from the primary surface can vary significantly depending on the type of airspace and the specific regulations in place. For larger airports, particularly those accommodating commercial air traffic, the Approach Surface can extend up to 50,000 feet from the primary surface. This distance ensures that there is sufficient space allocated for aircraft to safely approach the runway during landing and takeoff, factoring in the necessary safety margins to account for different flight paths, potential emergencies, and other operational considerations.

This extended distance is essential for maintaining safe vertical separation between aircraft and the ground, especially in areas where taller structures or terrain could pose an obstacle. The regulation practices guide how these surfaces are established to ensure the safety and efficiency of air operations.

In contrast, shorter distances, such as 200 feet or 1,000 feet, may apply in specific circumstances or for smaller facilities but do not reflect the regulatory framework for larger airports with substantial air traffic. Therefore, understanding the maximum potential distance of 50,000 feet is crucial for ensuring compliance with aviation safety standards and effective management of airport operations.