What is the required separation for an aircraft holding behind Category A?

• A. 1 minute
• B. 2 minutes
• C. 3 minutes
• D. 4 minutes

Answer: (D)

The required separation for an aircraft holding behind a Category A aircraft is four minutes. This substantial separation is necessary due to the slower speed and higher maneuverability of the Category A aircraft, which includes light aircraft and small general aviation planes.

When an aircraft is holding behind a slower-moving aircraft, the four-minute separation allows sufficient time for the trailing aircraft to descend or enter the approach sequence without risking the potential for wake turbulence or collision. This time buffer helps ensure safe spacing in the air traffic control system, particularly during holding patterns where the performance characteristics of different aircraft categories can significantly impact the flow of traffic.

In contrast, shorter separation times may not provide enough buffer for the trailing aircraft to adequately respond or position itself without jeopardizing safety.