How far does the Primary Surface extend beyond the runway thresholds?

The Primary Surface is a critical aspect of airport design and operations, particularly concerning the safety of approaches and takeoffs. It extends beyond the runway thresholds to provide an unobstructed area that is essential for aircraft maneuvering and safety. The correct distance that the Primary Surface extends beyond the runway thresholds is 200 feet.

This dimension is significant because it creates a safety buffer that helps protect aircraft during critical phases of flight such as landing and takeoff. By having this extension, it ensures that any obstacles or irregularities in the landscape are adequately accounted for, allowing for safer operations at the airport.

Understanding the specific measurements of safety zones, like the Primary Surface, is essential for airport planners and operators in order to comply with regulations and to enhance the safety of airport environments.