What is the best procedure for ensuring an NDB is operational?

Monitoring the NDB's identification continuously is the best procedure for ensuring that the NDB (Non-Directional Beacon) is operational. This involves listening for the Morse code identifier that the NDB broadcasts at regular intervals. If the NDB is functioning correctly, the identifier will be audible on the ADF (Automatic Direction Finder) receiver. Continuous monitoring allows flight crews to detect any issues with the NDB in real-time, ensuring it is providing reliable guidance during flight.

In contrast, testing the NDB's range regularly does not guarantee operational status; while range testing is useful, it needs to be supplemented with identification monitoring for confirmation of ongoing performance. Waiting for ground control confirmation may involve delays and does not provide immediate assurance of the NDB's operational status during flight. Checking the ADF receiver only before takeoff may overlook any potential issues that arise during the flight, making it insufficient for ensuring continuous operational capability. Thus, continuous monitoring of the NDB's identification stands out as the most effective method for confirming its operational status.