When can you go below decision altitude?

The correct choice is based on the regulations and standard operating procedures regarding decision altitude (DA) during an approach. You can go below decision altitude only when the runway environment is in sight. This allows the pilot to establish visual reference with the runway or its markings, confirming that it is safe to continue the approach and land.

Seeing the runway environment is crucial as it meets the requirement for visual reference necessary for a safe landing. This includes identifying aspects such as the runway lights, runway threshold, or any other landmarks that ensure the aircraft is in a position to safely land.

Reaching specific points during the approach, such as being on final approach or attaining a certain altitude, does not by themselves permit descent below DA. A go-around procedure would only be initiated if the criteria for landing were not met, reinforcing that visual contact with the runway environment is essential before descending past decision altitude.