ALS stands for which term?

• A. Approach Light System
• B. Airport Lighting System
• C. Approach Lighting Structure
• D. Advanced Lighting System

Answer: (A)

The main idea being tested is the name of the lighting arrangement at the approach end of a runway that guides aircraft on final approach. This is the Approach Light System, a white-light sequence extending from the runway threshold that helps pilots acquire the runway environment and judge distance and alignment in reduced visibility.

Why this is the best choice: it is the standard term used in aviation for the set of lights designed specifically to assist during the approach phase, providing a visual path to the runway and helping transition from instrument flight to landing.

The other options don’t fit because they describe broader or nonstandard terms. An Airport Lighting System refers to all lighting on an airport, not just the approach sequence. An Approach Lighting Structure isn’t a recognized term for this system, and Advanced Lighting System isn’t the standard name used for the approach lighting configuration.