Plain English Meaning

A line of lights stretching out from the runway end that helps you find and line up with the runway as you break out of the clouds. The outer lights flash in sequence toward the runway, almost pulling your eyes in, while the inner lights stay steady to show the centerline.

Full Definition

A standard approach lighting system installed on the runway approach end, consisting of a 1,400-foot configuration of steady-burning white light bars centered on the extended runway centerline, combined with a sequence of high-intensity flashing white lights (the Runway Alignment Indicator Lights, or RAIL) on the outer portion. MALSR is the 's standard for and is -intensity (lower output than the high-intensity ALSF used for /III runways).