Definition
An approach lighting system installed at the runway end of certain instrument runways, consisting of a configuration of steady-burning white lights extending outward from the runway threshold along the extended centerline. It provides visual guidance to pilots transitioning from instrument flight to visual references during the final phase of an instrument approach. SSALS is a shorter, simpler variant of the larger ALSF systems and affects the minimum visibility required for the approach when it is inoperative.
Plain English
A line of white lights leading up to the runway that helps a pilot pick out the runway environment when breaking out of cloud at the bottom of an instrument approach. It's a shorter, simpler version of the larger lighting systems used at busier runways.
Context Anchor
Seen on instrument approach charts, airport lighting information, and in inoperative-component notes when approach lights for a runway are not working.
Derivation
The name describes the system: 'Simplified' (fewer lights than the full ALSF), 'Short' (covers a shorter distance from the threshold), 'Approach Lighting System.' Knowing this tells you immediately it's a stripped-down cousin of the bigger systems.
Why Pilots Care
Pilots must recognize the exact lighting pattern to confirm runway alignment and adjust minimums if lights are inoperative.
Intuition Check
Do not read “short approach” as an instruction to fly a shorter approach. In SSALS, “short” describes the lighting system, not the way you fly the arrival.
Example Sentence 1
The NOTAM showed the SSALS was out of service, so we added the required visibility increase before briefing the approach.
Example Sentence 2
With the SSALS reported inoperative, the crew briefed higher landing minimums.