A problem with a flight plan processing system led to a 'critical exception', according to a new report.
"In these circumstances, the system could not reject the flight plan without a clear understanding of what possible impact it may have had.
"Nor could it be allowed through and risk presenting air traffic controllers with incorrect safety critical information. On the day, the time taken to recover was driven by the need to identify the problem and the specific data, isolate and remove it in a controlled way, and then test it to ensure it could be returned safely into operation."It added that the scenario had never been encountered before across more than 15 million flight plans over the five years it has been in service.
"I would like to reiterate my apology for the effects it had on so many people, including our airline and airport customers. Incidents like this are extremely rare and we have put measures in place to ensure it does not happen again." The failure is estimated to have cost airlines £100m, according to the head of the International Air Transport Association , Willie Walsh.
More than 1,000 flights departing UK airports were cancelled due to the problems last week, data from aviation analytics company Cirium revealed.
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