When two aircraft depart adjacent airports and diverge by 55° after takeoff, what is the minimum required separation time?

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The minimum required separation time when two aircraft depart adjacent airports and diverge by 55° after takeoff is determined by their rate of climb and the relative position of the aircraft as they begin to diverge.

When aircraft are departing, they generally climb at a consistent rate, and the separation requirement allows for safe maneuvering as their flight paths intersect less at the angle of divergence. In this scenario, a divergence of 55° indicates that the two aircraft will have significant horizontal separation as they take off.

Specifically, if one plane climbs at an average rate, the required separation time typically falls within the one-minute range at 55° divergence. This is a regulatory standard that ensures that both aircraft have sufficient vertical and lateral separation as they gain altitude and continue their climb-out. This time frame accommodates the potential for wake turbulence, maneuverability around obstacles, and airspace management.

Understanding the dynamics of flight paths and angles between aircraft is crucial in ensuring safety and preventing mid-air collisions during the critical phases of takeoff and climb. Therefore, the one-minute separation time is established as the norm under these specific circumstances, making it the correct answer.

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