What must PICs ensure regarding landing lights?

The requirement for landing lights to be illuminated below 10,000 feet MSL, day or night, is rooted in enhancing visibility and safety during critical phases of flight, particularly during takeoff and landing. This practice improves the conspicuity of the aircraft to both other pilots and ground personnel, decreasing the likelihood of midair collisions and facilitating better situational awareness for those on the ground.

Illuminating landing lights during these phases provides visual cues that are vital for operation in both day and night conditions. It ensures that the aircraft is more easily seen, which is essential in busy airspace or when approaching airports.

The other options do not align with the safety protocols established for flight operations. For instance, limiting the use of landing lights solely to nighttime does not consider the situations during the day when enhanced visibility can still be beneficial. Additionally, turning off landing lights above 10,000 feet MSL might compromise safety in busy traffic areas. Lastly, restricting the use of landing lights to just the approach disregards their importance during takeoff and taxi operations as well.