What is the minimum radar separation required when an aircraft is 40 miles from the antenna?

The minimum radar separation required when an aircraft is 40 miles from the antenna is 5 miles. This standard is based on guidelines established by the Federal Aviation Administration (FAA) and other relevant aviation authorities, which outline the necessary distance to ensure safe separation of aircraft in airspace.

At this range from the radar source, a 5-mile separation provides sufficient time for air traffic controllers to react to any changes in flight paths and ensures that the aircraft maintain safe vertical and lateral separation. This separation standard is established to mitigate the risk of collision while also accounting for the potential inaccuracies in radar data and the dynamic nature of air traffic.

The other values listed, such as 3, 7, and 10 miles, do not align with the established safety protocols for radar separation in this context. Each value may represent different scenarios or aircraft types but for the specific case of 40 miles from the antenna, the established minimum is indeed 5 miles.