Under what condition should nonradar separation be favored?

Nonradar separation should be favored when an operational advantage is realized because this situation allows for increased efficiency and better management of air traffic. Favoring nonradar separation can lead to a more effective use of airspace and resources when the conditions, such as weather, traffic volume, and aircraft performance, permit it. This practice often relies on established procedures and clearances that allow for the safe and efficient separation of aircraft without radar, which can help maintain the flow of air traffic even in scenarios where radar systems may not be actively available or when radar coverage is not reliable.

While loss of radar coverage, low traffic, and delays may create conditions where nonradar separation could be used, they do not inherently provide the same operational advantage as effectively managing traffic flow and utilization of airspace. The overall goal is to optimize flight operations while maintaining safety, which is best achieved when the advantages of nonradar procedures align with the current operational environment.