What is the minimum longitudinal separation required when using the 44-knot rule?

The minimum longitudinal separation required when using the 44-knot rule is 3 minutes or 5 miles. This rule applies to situations where aircraft are operating at significantly different speeds, specifically when one aircraft is traveling at a ground speed of 44 knots slower than another.

The intention behind this regulation is to ensure adequate spacing between aircraft to prevent wake turbulence and collision risks. When the trailing aircraft is slower, it requires additional time and distance to maintain a safe separation from the lead aircraft. The 3-minute time frame or the corresponding 5-mile distance are established based on standard calculations in aviation to ensure effective separation in air traffic control operations.

Understanding this separation rule is crucial for controllers to maintain safety in the airspace, particularly in busy environments where multiple aircraft traverse the same routes.