How far must runway centerlines be to allow for simultaneous departures when the departure course diverges by 30 degrees?

• A. 1500 ft
• B. 2000 ft
• C. 2500 ft
• D. 3000 ft

Answer: (C)

In air traffic management, when considering the safe and efficient operation of parallel runways, the distance between runway centerlines becomes crucial, especially for simultaneous departures. When the departure courses diverge by 30 degrees, the recommended separation distance is established to ensure that wake turbulence and the potential for collision are minimized.

The correct answer indicates that a separation of 2500 feet is required between runway centerlines when the departure courses diverge by this specific angle. This distance accounts for the safe trajectory of the aircraft as they move away from each other, considering factors such as the wingspan and performance characteristics of the departing aircraft. The 2500-foot separation is a recognized standard that ensures safety in operations by reducing the risk of wake turbulence encounters, which can be particularly hazardous during takeoff.

The requirements for other distances would not suffice because they may either be too close, increasing the risk of wake turbulence or collision, or excessively far, which does not align with the operational efficiency standards set for simultaneous departures. Thus, 2500 feet is the optimal distance that balances safety and operational efficiency under the specified conditions.