What is the minimum number of degrees of divergence required to authorize departures from two parallel runways in a non-radar environment?

• A. 30 degrees
• B. 45 degrees
• C. 60 degrees
• D. 90 degrees

Answer: (B)

The minimum number of degrees of divergence required to authorize departures from two parallel runways in a non-radar environment is 45 degrees. This standard is vital for ensuring adequate separation between aircraft to minimize the risk of collision during the initial phase of flight.

When aircraft depart from parallel runways, they must diverge sufficiently to avoid any potential conflicts. By establishing a 45-degree divergence, air traffic control can create a safe corridor for aircraft, allowing them to climb and track away from one another effectively. This provides a balance between maintaining safe operations while also allowing for efficient departures from parallel runways.

The choice of 45 degrees is established in regulations to promote operational safety, as it takes into account not only the lateral separation but also the vertical profiles of the aircraft as they become airborne. Lower degrees of divergence might not provide adequate separation, especially in non-radar environments where visual tracking is limited. Higher degrees, while sometimes providing even safer separation, are not necessary in this context and could lead to inefficient use of runways and airspace.