When radar is available, BE36 departing after an MD11 must maintain a minimum radar separation of how many miles?

• A. 3 miles
• B. 4 miles
• C. 5 miles
• D. 6 miles

Answer: (C)

Radar separation is the safety margin ATC maintains between aircraft on the radar screen to account for how fast each plane can move, how they might maneuver, and how quickly a conflict could develop. In this scenario, a BE36 is departing after a much faster MD11, and radar is available. The larger jet’s speed and climb capability mean the faster aircraft can reach conflict positions quickly if not kept far enough apart. Five miles provides a practical buffer that accommodates the MD11’s potential rapid changes in position and the BE36’s slower acceleration, ensuring there’s enough room for safe separation as both aircraft climb and proceed on course.

Three or four miles would be too tight given the speed difference, risking conflicts, while six miles would be more conservative than necessary for this typical tower radar environment. So the standard minimum is five miles.