What is the required distance for separation from the edge of the radar scope when the aircraft is less than 40 miles from the radar antenna?

The required distance for separation from the edge of the radar scope when the aircraft is less than 40 miles from the radar antenna is 3 miles. This standard is established to ensure that aircraft operating within the radar coverage have a safe buffer zone, allowing for accurate tracking and reducing the risk of incursion into areas that could lead to conflicts with other aircraft.

Maintaining a separation distance helps pilots and air traffic controllers manage aircraft movements safely, providing an additional margin of safety in busy airspace. This 3-mile separation requirement is particularly important in ensuring that any potential interference or limitations in radar coverage do not affect the safe operation of the aircraft.

The other choices do not reflect current standards for radar separation distances, which is why they are not applicable.