What must a controller do when an aircraft is landing near the boundary of adjacent center airspace?

When an aircraft is landing near the boundary of adjacent center airspace, the controller is responsible for ensuring that all necessary coordination is completed to maintain safe and efficient traffic flow. By coordinating and issuing clearance for descent, the controller ensures that the aircraft is properly sequenced for landing while also making sure that any other traffic in and around the airspace is taken into account.

This action is crucial because the controller must confirm that the descent clearance is in accordance with the appropriate procedures and that it does not interfere with any other air traffic. Coordination helps mitigate the risk of conflicting traffic situations that could arise when dealing with multiple jurisdictions of airspace. Maintaining communication and coordination with adjacent centers allows for safe management of air traffic as it approaches airspace boundaries.

In contrast, the other choices involve actions that may not address the complexities of an aircraft landing near airspace boundaries. For example, issuing a landing clearance without coordination could lead to conflicts with adjacent airspace operations. Similarly, directing the aircraft to circle or requesting the pilot to abort landing does not facilitate a safe approach or descent and may unnecessarily delay the aircraft’s landing procedure.