What is the MDA when the glide slope is notamed OTS?

The Minimum Descent Altitude (MDA) is a critical altitude to know during an approach, particularly in situations where the glide slope is inoperative. When the glide slope is "Notam OTS" (out of service), pilots must rely on their approach procedures that are designated for such scenarios.

In this case, the MDA would be determined based on the type of approach being executed and any associated charts. When the glide slope is not available, pilots typically refer to the published approach charts, which provide the MDA for the specific approach procedure being conducted. The MDA represents the minimum altitude to which an aircraft can descend during the final approach segment of a non-precision approach before intending to conduct a missed approach.

In this example, the correct answer of 440 feet reflects the specific MDA applicable for the relevant approach when the glide slope is not operational. Pilots should always consult the most recent approach plate to confirm this information, as MDAs can vary depending on factors such as the runway being used and environmental considerations.