What should a controller do if an aircraft’s radar ID is lost during an approach?

When an aircraft's radar ID is lost during an approach, the appropriate action is to re-establish radar contact. This is critical because maintaining continuous situational awareness is essential for safe air traffic control. Re-establishing radar contact enables the controller to monitor the aircraft’s position and ensure a safe approach and landing while minimizing the risk of collision with other aircraft or obstacles.

Visual identification may not always be feasible or safe in busy terminal airspace, especially during adverse weather conditions. Terminating radar services immediately could leave the aircraft without necessary guidance and increase the risk of an incident. Requesting the aircraft to switch frequencies may not be effective, as the loss of radar ID could mean the aircraft is unable to communicate properly or may not be aware of the lost ID situation. Hence, focusing on re-establishing radar contact is crucial for ensuring ongoing safety and effective communication.