When is nonradar separation preferred over radar separation?

Nonradar separation is preferred over radar separation when an operational advantage will be gained. This typically refers to situations where the available radar services may not fully support the separation requirements, or where the use of nonradar methods can enhance safety and efficiency.

For instance, in cases where the workload for air traffic controllers is reduced, or where traffic patterns are predictable, nonradar separation can effectively manage the airspace. This can also happen in specific environments where procedural control is adequate and operationally beneficial, often allowing for gaps in traffic that radar may not efficiently manage.

Other options, while they may have some validity in certain contexts, do not capture the primary principle behind the preference for nonradar separation. For instance, operational advantages can be unique to the situation and enable safer, more efficient management of aircraft, making this choice the most appropriate in evaluating factors impacting air traffic control operations.