If the glide slope warning flag appears after passing the final approach fix in IFR conditions, what can the pilot do?

When the glide slope warning flag appears after passing the final approach fix in IFR conditions, it indicates that the glide slope is inoperative or unreliable. In this situation, the appropriate action for the pilot is to descend to the localizer Minimum Descent Altitude (MDA).

This approach allows the pilot to continue the descent safely while adhering to the established procedure for the landing. The localizer MDA is a predetermined altitude that is safe for the operation when flying an approach without glide slope guidance.

Descending to this altitude ensures that the pilot maintains a safe profile for landing while being prepared to execute a go-around if visual references for landing are not acquired by the time the MDA is reached. This action supports maintaining a safe and controlled approach in the absence of glide slope information.