Definition
A runway approach lighting system that uses a shorter configuration of white lights extending out from the runway threshold, providing visual guidance to pilots transitioning from instrument flight to a visual landing. SSALS is a non-precision approach lighting system, typically about 1,400 feet long, used at runways that do not require the full-length lighting found at precision-approach runways.
Plain English
A row of bright white lights leading up to the runway, but a shorter version than the ones used at major airports. It helps pilots see and line up with the runway when breaking out of clouds on an approach.
Context Anchor
Seen in instrument approach information and in discussions of inoperative approach lighting components.
Derivation
The name describes the system directly: 'Simplified' (fewer light bars and features than a full system), 'Short' (about 1,400 feet rather than the longer 2,400–3,000 feet of larger systems), and 'Approach Lighting System' (lights guiding the final approach to the runway).
Why Pilots Care
An inoperative SSALS typically raises the required visibility for an instrument approach, directly affecting whether a landing can be attempted.
Intuition Check
“Short” does not mean the pilot flies a shorter approach. It describes the shorter length of this lighting system compared with larger approach lighting systems.
Example Sentence 1
Because the SSALS was reported out of service, the pilot added the required visibility increment to the approach minimums before continuing.
Example Sentence 2
With SSALS reported out of service, the crew added one-quarter mile to the published visibility requirement.