At what distance from the radar antenna do Terminal controllers begin to use radar separation?

Terminal controllers begin to use radar separation at a distance of 40 miles from the radar antenna. This distance is significant because it allows air traffic controllers to efficiently manage aircraft as they approach an airport for landing or departure. Radar separation ensures that aircraft maintain a safe distance from one another during these critical phases of flight, reducing the risk of collision and enhancing overall safety in the terminal airspace.

Utilizing radar separation at 40 miles provides controllers with adequate time to assess the positions and trajectories of multiple aircraft, facilitating a smooth flow of air traffic and allowing for necessary adjustments to altitude and heading. This practice aligns with established procedures and guidelines in air traffic control, which define specific distances for the implementation of radar separation to optimize safety and efficiency.