Definition
A surface surveillance system used by air traffic controllers at certain airports to track the position and identity of aircraft and equipped vehicles operating on runways, taxiways, and in the airspace immediately around the airport. ASSC combines several data sources — including surface movement radar, multilateration, and ADS-B — to give controllers a clearer picture of traffic on the airport surface, particularly in low visibility, at night, or when direct visual observation from the tower is limited.
Plain English
A system that lets tower controllers see where aircraft and vehicles are on the airport surface, even when they can't see them out the window. It pulls together radar and other tracking data to show everything moving on the ground in one display.
Context Anchor
Seen in runway safety, airport surface movement, and air traffic control system descriptions for airports equipped with ASSC.
Derivation
The name describes the function plainly: 'surveillance' means watching or monitoring, and 'capability' indicates it is a system providing that function specifically for the airport surface.
Why Pilots Care
It helps prevent runway incursions by giving controllers accurate, up-to-date surface positions in all visibility conditions.
Intuition Check
ASSC is not a clearance and it is not equipment the pilot normally operates directly. It is mainly a controller display system that improves awareness of traffic on the airport surface.
Example Sentence 1
Because the airport had ASSC, the tower was able to confirm our position on taxiway Bravo even though fog had reduced visibility to a quarter mile.
Example Sentence 2
During low-visibility operations, ASSC allowed the tower to track all ground movements safely.