In a nonradar environment, how many minutes of separation are required for two departures that will diverge by 45° or more immediately after takeoff?

In a nonradar environment, when two aircraft are departing and will diverge by 45° or more immediately after takeoff, the required separation is one minute. This is established to ensure that as soon as the aircraft take off, they can safely maneuver without the risk of coming too close to one another, even without radar data for tracking their positions.

This time of separation is critical in maintaining safety in the airspace, allowing pilots to gain altitude and adjust their flight paths according to the approved divergence angle. A divergence of 45° or more reduces the likelihood of lateral conflict, and with a one-minute separation, air traffic control can ensure enough time that both aircraft can safely enter their respective flight paths.

Divergence angles and the corresponding separation criteria are set to facilitate effective traffic management, especially in environments lacking advanced tracking technologies.