Originally Posted by
grizzled
Hint as to the root cause of this event: If your statement is correct then the root cause of the system failure is NOT a specific "French airline's flight plan".
Correct. I have no idea yet whether it was an issue with NAS or a French flight plan. But if that was the case it is a, probably unusual, flight plan that has been through multiple layers of validation that happens to expose an issue in the FDP system. The flight plan is the initiator and, using some methods, a cause but not the real issue.