Definition
The Facility Central Processing Unit (FCPU) is the main computer at an air traffic control facility that processes radar, flight plan, and surveillance data and distributes it to controller workstations. It serves as the central hub that takes raw inputs from radar, communications, and flight data systems and turns them into the integrated information that controllers see on their displays.
Plain English
The main computer at an ATC facility that gathers all the incoming data and feeds it to the controllers' screens.
Context Anchor
A pilot is most likely to see FCPU in FAA acronym lists, technical notices, or system-status information, rather than as a cockpit control or normal pilot procedure.
Derivation
“Facility” means an operating site or location. “Central processing unit” comes from computer terminology and means the main part of a computer system that carries out processing. Together, the phrase points to the main processing equipment for a specific aviation facility.
Why Pilots Care
If the FCPU at a facility goes down or is degraded, controllers may lose radar processing or flight data automation, which can lead to delays, reroutes, or non-radar separation procedures. Pilots may notice this as ground stops, holding, or unusual handling instructions.
Intuition Check
Do not read FCPU as a cockpit unit or pilot-operated device. It refers to processing equipment used by an aviation facility.
Example Sentence 1
A NOTAM advised that the FCPU at the center was operating in backup mode, so controllers were issuing fewer direct routings than usual.
Example Sentence 2
The FCPU coordinates radar feeds and communication links for the entire facility.