When can mileage-based DME and ATD procedures be utilized?

Mileage-based Distance Measuring Equipment (DME) and Altitude Transition Detailed (ATD) procedures are designed to enhance situational awareness and ensure safety during aircraft operations. Direct communication between the pilot and the controller is essential for these procedures as it facilitates real-time coordination and allows the controller to provide necessary instructions and updates tailored to the flight's mileage and altitude requirements.

When direct communication exists, pilots can receive critical information regarding their position, clearance, and any necessary adjustments as they navigate through controlled airspace. This interaction ensures that any changes to the planned route or altitude are communicated promptly, minimizing the risk of misunderstandings or errors. Therefore, the requirement for direct pilot-controller communications ensures that the procedures are applied safely and effectively.