How many degrees must headings diverge by when clearing nonradar departing aircraft?

The correct choice is 45 degrees because when it comes to issuing headings for nonradar departing aircraft, air traffic control guidelines specify that headings should diverge by at least that amount. This is essential for maintaining safety and avoiding potential collisions during departure and climb-out phases, where aircraft could inadvertently enter the same airspace or flight path if their headings are too similar.

By establishing a divergence of 45 degrees, air traffic controllers can ensure that the aircraft are adequately spaced and on different trajectories, increasing the margin of safety. This standard is based on operational safety practices that account for factors such as turning radius and airspeed of departing aircraft, which together help to create a safe operational environment in busy airspace zones.

Understanding this guideline is crucial for effective air traffic control, particularly when managing multiple aircraft departures in sequence.