What is the minimum degree divergence required to authorize simultaneous departures from parallel runways in a non-radar environment?

• A. 30 degrees
• B. 40 degrees
• C. 45 degrees
• D. 50 degrees

Answer: (C)

The minimum degree divergence required to authorize simultaneous departures from parallel runways in a non-radar environment is indeed 45 degrees. This standard is established to ensure sufficient separation between aircraft to minimize the risk of collision, particularly during the critical phases of takeoff.

In a non-radar environment, where air traffic controllers rely on visual observation and reports from pilots rather than radar tracking, maintaining this minimum divergence helps to ensure that aircraft are sufficiently spaced apart to avoid any potential interference as they take off in close proximity. This degree of divergence creates a safer operational environment, as it allows each aircraft to follow its own flight path without the risk of infringing on the other’s flight trajectory.

The choice of 45 degrees as the standard reflects a balance between operational efficiency and safety, considering the limitations of communication and observation in a non-radar setting. It also allows for easier management of air traffic and ensures that pilots have clear and defined paths to follow immediately after takeoff.