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The regulation doesn't, no, the technical details of MCAS as a piece of software necessary to maintain airworthyness however, demand the flight control computer be able at all times to work as designed to maintain the regulated condition of airworthyness. Namely, no control stick force inversions on approach to stall.

It's kind of hard to do that with a computer if you've lost your electrics. Therefore either the system needs to be bulletproof, or you should have designed out the need for the crutch in the first place. Not gone and made a Frankenstein's monster of a plane.

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