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Also, there is a regulation that requires no design have a single point of failure capable of resulting in a catastrophic outcome.

That's why they have to rearchitect the system. If those bit-flips happened to the Flight Computer in command, they could lose the plane. Therefore, redundancy must be built in.

It wasn't originally evaluated as posing a catastrophic outcome in the safety analysis, which is why no one paid it any mind.

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