When is the "interval" achieved in a landing pattern scenario?

The correct choice is based on the concept of ensuring safe separation between aircraft during landing sequences. In a standard landing pattern, the "interval" is achieved when the trailing aircraft is positioned appropriately in relation to the leading aircraft, establishing a safe distance that minimizes risk of wake turbulence and potential collision.

Specifically, the interval is considered established after the leading aircraft has completed a substantial portion of its landing approach, typically at least 90 degrees of its turn, which is generally aligned with the final approach to the runway. This milestone indicates that the leading aircraft is well-established on its landing trajectory, allowing the trailing aircraft to safely proceed with its own landing clearance.

Understanding this interval is crucial for air traffic controllers and pilots, as the proper spacing between aircraft during landing is vital for maintaining safety in the operational environment of an airport.