What is the minimum required speed difference for applying the 22kt rule?

To apply the 22-knot rule, it is essential that there is a minimum speed difference of 22 knots between two aircraft. This rule is used primarily to ensure safe separation and adequate spacing during various phases of flight, particularly during approach and departure operations. By having a defined speed differential, air traffic controllers can manage the flow of air traffic more effectively and reduce the risk of wake turbulence or other hazards that can arise when aircraft are flying at similar speeds in proximity to each other. The specification of this threshold helps to establish a clear and standardized approach for air traffic management, thereby promoting safety and efficiency in aircraft operations.