Definition
The packet-switching nodes within the National Airspace Data Interchange Network (NADIN) that route flight plans, weather data, NOTAMs, and other aeronautical messages between FAA facilities and authorized users across the National Airspace System.
Plain English
The computer switches that move flight plans, weather, and NOTAMs around the FAA's data network so the right information reaches the right facility.
Context Anchor
Seen in FAA acronym lists, NOTAM-related material, and system status language dealing with aviation information networks.
Derivation
NADIN stands for National Airspace Data Interchange Network. A 'switch' here is a network device that directs data traffic, much like a telephone switch routes calls. NADSW simply names the switches that make up that network.
Why Pilots Care
When you file a flight plan or read a NOTAM, NADIN switches are part of the invisible plumbing that moves that information between FAA computers. Pilots don't operate them, but knowing the term helps when reading FAA system documentation.
Intuition Check
Do not read switches as cockpit switches or light switches. Here, switches means data-routing equipment in an FAA information network.
Example Sentence 1
Flight plan messages are relayed through NADIN switches before reaching the destination ARTCC.
Example Sentence 2
Maintenance on NADIN switches can temporarily affect data availability for pilots.