What does it indicate when approach lights are visible?

When approach lights are visible, it indicates that the aircraft is nearing the touchdown zone of the runway. Approach lights serve as a visual aid, helping pilots to align with the runway during the final stages of landing. Their visibility signifies that the aircraft is in the correct phase of its approach, providing reassurance that it is on the right path to land safely. This is crucial during low visibility conditions where other references may be obscured.

Visibility of approach lights does not correlate with increased turbulence or specific clearance for descent, nor does it suggest the need to initiate a go-around. Instead, it focuses on the proximity of the aircraft to the runway's touchdown zone, supporting pilots in preparing for landing.