Plain English Meaning

Two versions of a shorter approach light system that sits just before the runway. SALS is a line of steady white lights that points the pilot to the runway. SALSF is the same line of lights plus a chain of flashing lights that pulse toward the runway one after another, like a moving arrow guiding you in.

Full Definition

SALS and SALSF are two related runway approach lighting systems installed on the approach end of certain instrument runways. SALS consists of a configuration of steady-burning white lights extending outward from the runway threshold for 1,500 feet, providing visual guidance to pilots transitioning from instrument to visual flight on final approach. SALSF is the same physical layout as SALS but adds sequenced flashing lights -- a series of lights that flash in rapid succession toward the runway threshold, creating a visual 'rabbit' that helps the pilot the . are referenced in the 's , which specifies the increase in required when these lights are not working.