Why do airplane wings have red and green lights?

Discover the significance of the red and green lights on airplane wings, designed to enhance safety and navigation during flight, especially under low-visibility conditions.

Airplane wings are equipped with red and green navigation lights to enhance visibility and ensure safety during flight operations. These lights, also known as position lights, serve critical purposes in identifying the aircraft's direction and preventing collisions.

Key Features of Navigation Lights:

  • Red and Green Positioning: The left wingtip (port side) has a red light, while the right wingtip (starboard side) has a green light. This configuration allows observers and other pilots to determine the aircraft's orientation and direction of travel. For example, if you see the red light on the left and the green light on the right, the aircraft is moving away from you. If reversed, the aircraft is approaching.
  • White Tail Light: In addition to the wingtip lights, a white light is typically placed on the tail of the aircraft. This light helps enhance visibility from the rear, ensuring the aircraft can be seen from all directions​.

Functions and Benefits:

  • Increased Visibility: Navigation lights are crucial for nighttime and low-visibility flying conditions, making the aircraft visible to other pilots and air traffic controllers. They help in identifying the aircraft's position and movement, thus reducing the risk of in-air collisions​.
  • Collision Avoidance: The use of red and green lights was adapted from maritime practices where similar lighting configurations helped prevent ship collisions. In aviation, these lights help maintain safe distances between aircraft, especially in congested airspaces.

Modern aircraft often use LED technology for these lights, offering greater brightness and longevity compared to older lighting systems. Additionally, pilots generally keep these lights on at all times, not just during night flights, to maximize visibility and safety