Definition
A configuration of approach lights installed on the ground in line with a runway centerline, extending outward from the landing threshold to help pilots align with and identify the runway during an instrument or low-visibility approach. SSALS is a shorter, simplified version of a full approach lighting system, consisting of a series of light bars positioned along the extended centerline for a limited distance from the threshold.
Plain English
A row of bright lights on the ground leading up to the start of the runway, set up in a shorter, simpler pattern than a full approach lighting system. They help pilots see and line up with the runway when visibility is poor.
Context Anchor
Seen on airport lighting descriptions, instrument approach charts, and airport facility information for runways equipped with approach lights.
Derivation
Simplified means a stripped-down version. Short refers to the limited distance the lights extend from the threshold compared to a full-length system. Approach Light System describes lights that guide aircraft on final approach to the runway. The name tells you exactly what it is: a shorter, simpler approach light system.
Why Pilots Care
Gives pilots a reliable visual reference on final approach at airports that do not have a full-length approach light system installed.
Analogy
Think of it like a shorter lighted path leading to a doorway. It does not fly the airplane for you, but it helps your eyes find the correct path to the entrance.
Intuition Check
“Simplified” does not mean unofficial or optional; it means the light layout is less complex than some larger approach light systems. “Short” refers to the shorter lighting layout, not to a special short landing technique.
Example Sentence 1
The runway was equipped with SSALS, giving the pilot a clear line of lights to follow on final approach.
Example Sentence 2
Runway 27 is equipped with a Simplified Short Approach Light System rather than a full ALSF-2 array.