What is the primary purpose of navigation lights on an aircraft?

The primary purpose of navigation lights on an aircraft is to help a pilot see and determine the direction of other airplanes. These lights are essential for ensuring safety in the airspace, especially during night flying or in low visibility conditions. Navigation lights consist of red and green lights on the wings and a white light on the tail. The red light is on the left wingtip, the green light is on the right wingtip, and the white light at the tail helps provide a full picture of the aircraft's orientation.

When pilots view another aircraft's navigation lights, they can determine its relative position and direction. For example, if a pilot sees a green light, it indicates that the other aircraft is approaching from the right. This visual information is crucial for maintaining safe distances and avoiding mid-air collisions, particularly when flying in congested airspace or during night operations.