The approach light system (ALS) helps with what transition during an aircraft approach?

The approach light system (ALS) is designed primarily to assist pilots in transitioning from instrument flight to visual flight during an aircraft's landing approach. Its primary function is to provide visual cues that enhance the pilot's ability to see the runway environment as they descend towards landing.

When an aircraft is approaching for landing, pilots typically rely on instruments, especially in low visibility conditions. As the aircraft gets closer to the runway, visual references become increasingly important for safe landing. The ALS aids in this transition by illuminating the approach path and providing visual indicators that inform the pilot of their position relative to the runway.

This system facilitates a smooth change from relying solely on instruments to gaining visual confirmation of the runway and surrounding environment, thereby enhancing situational awareness and safety during the landing process.