Which condition is necessary for maintaining radar contact with an aircraft?

Maintaining radar contact with an aircraft requires that all potential conflicts are resolved. This is crucial because radar systems rely on the ability to accurately track the position and movement of aircraft in the airspace. Conflicts can arise from various factors, such as proximity to other aircraft or airspace restrictions, which can complicate radar tracking.

When conflicts are resolved, it ensures that the radar system can maintain a clear, uninterrupted view of the aircraft's location and trajectory. This enables air traffic controllers to provide effective separation and safety guidance to the aircraft.

While clear weather conditions, the use of transponders, and pilot adherence to flight instructions all contribute to effective radar operations, they do not singularly ensure continuous radar contact. For instance, radar can still function in less-than-ideal weather with transponder signals, and pilots can generally follow instructions, but if conflicts aren't adequately resolved, radar contact could be compromised. Thus, resolving all potential conflicts is a necessary and fundamental condition for maintaining consistent radar contact with aircraft.