Why may radar services be terminated for an aircraft?

Radar services may be terminated for an aircraft when ID is no longer necessary because this indicates that the situation has changed and the use of radar services is no longer required for safety or operational purposes. This often occurs when the aircraft has transitioned to a phase of flight where its position and intentions can be effectively managed through other means, such as communication with a control tower during final approach to land or when operating in visual flight rules (VFR) conditions in uncontrolled airspace.

In many cases, pilots may be able to proceed visually or have received the necessary traffic advisories, thus making the continuous provision of radar services redundant. This decision is made by air traffic control, reflecting that they are confident in the aircraft's ability to navigate and communicate safely without radar assistance at that moment.

The other options do not accurately justify a termination of radar services. A request to change frequencies by the pilot does not inherently necessitate terminating radar services, as these can continue on a different frequency. Radar coverage being available does not lead to the termination of services; rather, it is the opposite, as continuous coverage typically promotes ongoing services. Lastly, an aircraft about to land is usually still within the radar service area, and termination is usually not done until after landing when the aircraft safely