What does "ALS" stand for in aviation?

The term "ALS" in aviation stands for "Approach Lighting System." This system is designed to assist pilots during their approach to landing by providing visual guidance to the runway. It typically consists of a series of lights arranged in a specific pattern, which helps indicate the alignment and glide path for a safe landing, especially in low-visibility conditions.

The importance of the Approach Lighting System lies in its ability to enhance situational awareness and provide essential cues to pilots as they approach the runway. By improving visibility and defining the approach path, the ALS plays a critical role in ensuring safe landings and reducing the risk of accidents during one of the most critical phases of flight.