What is the function of the wing lights?

The wing lights on the A320 serve the specific purpose of illuminating the leading edge of the wing and engine air intake for icing inspection. This is crucial during flight operations, particularly in conditions where ice accumulation could affect the aircraft's performance and safety. By providing targeted illumination, these lights allow pilots to visually inspect vital components for ice presence, ensuring that the aircraft is safe for operation.

While other options may refer to functions associated with different types of lights or signals on the aircraft, the primary and correct purpose of the wing lights is indeed focused on aiding in the detection of ice on critical surfaces. This particular application is essential for maintaining safety standards during flight operations, especially in colder environments.