NATS’ preliminary investigation has confirmed the root cause that led to air traffic control failures. The report identified an issue with a flight plan processing sub-system called Flight Plan Reception Suite Automated – Replacement (FPRSA-R).
It was found to have encountered an extremely rare set of circumstances presented by a flight plan that included two identically named, but separate waypoint markers outside of UK airspace.
This led to a ‘critical exception’ whereby both the primary system and its backup entered a fail-safe mode. nats.aero
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