Using the approach lighting system, to what altitude above the touchdown zone may you descend?

• A. 50 feet above the TDZ
• B. 150 feet above the TDZ
• C. 100 feet above the TDZ using the approach lights.
• D. 200 feet above the TDZ

Answer: (C)

Approach lighting systems give pilots visual cues that help transition from instrument guidance to a visual landing. When you’re aligned with the runway, have the ALS in sight, and the required visual references are present, you’re permitted to descend to 100 feet above the touchdown zone and continue visually to land. The lights support this lower descent by providing reliable cues of the runway environment.

So, 100 feet above the TDZ is the allowed level using the approach lights, rather than 50, 150, or 200 feet. If you don’t have the runway environment in sight, you’d stay higher and follow the published minimums until you do.