What specific aircraft condition must be met for transferring radar identification without verbal coordination?

The requirement for transferring radar identification without verbal coordination hinges specifically on the aircraft being at an assigned altitude in level flight. This condition is crucial because it ensures that the aircraft is stable and maintaining its altitude, minimizing the risk of altitude-related conflicts during the transfer of responsibility from one controller to another. When an aircraft is in level flight at an assigned altitude, it indicates that it is not climbing or descending, which means that the pilot and the receiving controller can manage the airspace more effectively without immediate concerns regarding altitude changes that could lead to potential misunderstandings or safety issues.

In contrast, conditions such as cruising speed, approaching a landing strip, or nearing the end of a flight plan do not directly correlate with the assurance of safe and clear altitude management during the transfer of identification. These factors may influence operational decisions but do not provide the same level of certainty needed for seamless radar identification transfer without further verbal communication.