What should a controller do when a pilot reports a malfunctioning NAVAID?

When a pilot reports a malfunctioning NAVAID, it’s crucial for the controller to gather as much information as possible to assess the situation effectively. Instructing a second aircraft to monitor the NAVAID and report its status allows the controller to obtain an independent verification of the malfunction. This information is vital for ensuring the safety of other aircraft that may rely on the same NAVAID. Gathering data from multiple sources can help in making informed decisions about air traffic management and potential rerouting or dissemination of information to other pilots.

This approach can lead to immediate actions if the malfunction is confirmed, such as issuing NOTAMs or providing alternative navigation instructions to other aircraft, thus enhancing overall safety and situational awareness in the airspace. It also helps in ascertaining whether the issue is isolated to that specific aircraft or if it affects a broader number of planes in the vicinity.