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You're not Boeing to believe this, but... Another deadly 737 Max control bug found

caffeine addict

Another "as I understand it" answer...

The MAX isn't unstable. But it is "differently stable". That difference means that it would need retraining and re-certification. The problem with re-certification is that the rules have changed since the 737 was certified, and re-certification would involve fixing lots of other bits as well as retraining pilots.

By putting the MCAS system in place, they tried to make a computer tweak that "differently stable" system to replicate the previous stable state, meaning no re-certification was needed because nothing had changed.

Which I could understand if we weren't talking about aeroplanes...

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