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Some notes about the UK air traffic control meltdown (jameshaydon.github.io)

submitted 1 year ago by [email protected] to c/[email protected]

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[–] byroon 4 points 1 year ago* (last edited 1 year ago)

This is overly dense and could do with editing but is pretty interesting imo. Here's my attempt at summary:

NATS gets the flightplan in ICAO format
they need to extract just the UK part of that flight plan
they convert the ICAO flight-plan to ADEXP format, which contains additional waypoints
they find the UK section of the ADEXP
they now need to convert back to ICAO
they try to match the start and end of the UK ADEXP to ICAO
duplicate waypoint names exist! The end of the ADEXP route gets wrongly matched with the start of the ICAO route (cos they have the same name)
the software recognises this doesn't make sense, but instead of rejecting this flight plan shuts the entire system down
the backup system comes online, and reprocesses the same data, hits the same bug, and shuts down as well