When should DME distances be advised to a pilot?

DME distances should be advised to a pilot when applying DME separation, as this information is crucial for ensuring that aircraft are adequately separated from one another. DME, or Distance Measuring Equipment, provides real-time information about the distance between the aircraft and a ground station, which is vital when implementing procedures for maintaining safe distances, especially in controlled airspace or congested areas.

By providing DME distances in these circumstances, air traffic controllers can effectively manage traffic and enhance situational awareness for pilots. This allows for more precise navigation and assists pilots in making informed decisions regarding their flight path relative to other aircraft. Understanding and using DME distances helps mitigate the risk of potential conflicts in the airspace.

In other situations, such as during takeoff, it is typically not necessary to advise DME distances, as the focus is more on initial climb and departure instructions. Similarly, while making vertical separation adjustments and during the approach to land, there may be other priority communications that take precedence over DME distances.