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You're missing that the systems were designed in the 90's and they had no edac on them but instead relied on redundancy and a consensus system. The fact bit flips happened is not why they grounded the things and updated sw, they grounded them to address the consensus algorithm in the other CPU that did not get the bit flips.

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Do you have a source on that? The current article describes the software very differently:

> In any case, the software updates rolled out by the company appear to be quick and easy to install. Many airlines completed them within hours. The software works by inducing "rapid refreshing of the corrupted parameter so it has no time to have effect on the flight controls", Airbus says. This is, in essence, a way of continually sanitising computer data on these aircraft to try and ensure that any errors don't end up actually impacting a flight.

Yes, my understanding of this was wrong and based on reading the failure analysis of another issue that was related to the ELAC but the SEU failure happened in the ADIRU.

I take my analysis on this back, it was true only for the other incident. I can't edit my answers anymore now. Not sure what is going on with this failure, would love to read a detailed analysis report as the other one I went through.

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