Definition
A communications relay facility within the Automatic Digital Network (AUTODIN) that routes formatted messages between military and government users. In aviation, ASCs historically handled flight plans, weather data, and NOTAMs passing through the U.S. military message system before delivery to the appropriate end stations.
Plain English
A message-sorting hub on an old military computer network. It received digital messages, figured out where each one needed to go, and sent them on to the right destination.
Context Anchor
Seen in FAA acronym, abbreviation, and NOTAM contraction lists, especially when reading older or system-related aviation references.
Derivation
AUTODIN stands for Automatic Digital Network, a U.S. Department of Defense data communications system that operated from the 1960s into the 2000s. A switching center in this sense is a place that receives messages and switches (routes) them onward — much like a telephone switchboard, but for digital traffic.
Why Pilots Care
Most pilots will not deal with an ASC directly today, but the term still appears in FAA acronym lists. Recognizing it helps when reading older publications or NOTAM-related references that mention how aviation messages once moved between agencies.
Intuition Check
Do not read “switching center” as an air traffic control center. Here it means a communications site that routes messages, not a facility that controls aircraft.
Example Sentence 1
In older FAA documentation, flight plan messages were shown being relayed through an ASC before reaching their destination facility.
Example Sentence 2
Military units relied on the ASC to exchange digital information quickly.