If you only see the approach light systems at Decision Height (DH), can you descend further?

The correct answer indicates that if you observe the approach light systems at Decision Height (DH), it is permissible to continue your descent to 100 feet above the Touchdown Zone Elevation (TDZE).

This practice is based on the principles outlined in instrument flight rules, where the visibility provided by approach lights can help the pilot ascertain the landing environment. The approach lights provide visual cues that can indicate the runway's proximity, which is important for safely continuing the approach during low visibility conditions.

When a pilot can clearly see the approach light systems at or above DH, it signifies that there is enough visual reference to conduct a safe landing approach. This allows the pilot to descend further, providing a cushion of safety as they make their final descent toward the landing area.

In terms of the other options, remaining at DH or executing a missed approach would not utilize the visual reference provided by the approach lights, essentially not making the best use of available information to ensure a safe landing. The guidelines that permit further descent when the approach lights are visible reflect a balance of safety and the ability to navigate effectively under instrument conditions.