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Yes, that's the official explanation. But these problems (such as gamma rays scrambling the flight computer, causing the plane to aggressively dive) are ostensibly not new, or related to MCAS. The issue is not just that gamma rays theoretically – and MCAS, in real-life and quite tragically – cause the plane to dive, but that Boeing overestimated pilots' ability to react to the underlying systems error. I think it seems suspicious Boeing only now decides "Oh, looks like we should also modernize the 737 computers", while asserting that MCAS itself was still a great idea.

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