After descending below the DH and losing sight of the runway, what action should you take?

When you descend below the Decision Height (DH) and lose sight of the runway, the appropriate action is to execute a missed approach procedure. The DH is the minimum altitude at which a decision must be made to either continue the approach or initiate a go-around. If visual references to the runway are lost after reaching this critical point, it indicates that a safe landing cannot be assured, and continuing the approach would pose significant safety risks.

Executing a missed approach procedure is designed to provide a clear and structured way to safely exit the approach path and either set up for another attempt at landing or divert to an alternate airport. This decision prioritizes safety by ensuring that the aircraft is not put into a potentially hazardous situation, such as low visibility conditions that could lead to an accident.