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I don't disagree that this is an important thing to test for. I question why this is the reported explanation for why Boeing now decided that the computer systems needed an extensive overhaul. Ostensibly, "gamma rays from space" affecting flight control computers would be an issue that affected Boeing's planes long before MCAS.

But it's not the gamma rays that are the reason for the systems redesign, it's the fact that "at least one of the pilots who flew the scenario in a simulator found it difficult to respond in time to maintain control of the plane".

Boeing's assumption that pilots could respond quickly enough to a loss of control in the cockpit was an underlying motivation for designing MCAS with inadequate safety measures.

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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