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- approach lighting system | approach light system | ALS
- en
- Definition lighting system installed on the approach end of an airport runway, consisting of a series of lightbars, strobe lights, or a combination of the two that extends outward from the runway end Reference "Wikipedia > Approach lighting system, http://en.wikipedia.org/wiki/Approach_Lighting_System (21.8.2008)"
- Comment ALS usually serves a runway that has an instrument approach procedure (IAP) associated with it and allows the pilot to visually identify the runway environment once he or she has arrived at a prescribed point on an approach.