The key to the story is the single angle-of-attack sensor. Aviation, like any safety culture, normally emphasizes backups and redundancies. Boeing put in one, and made the second one an optional upgrade. A lot more to say. (*gets on writing treadmill* I guess). https://twitter.com/jacknicas/status/1111793410644426754 …
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Totally design-stage issues. The coder doesn't arbitrarily say "ok lemme just use sensor 1 for this calculation"
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Correct, they only added MCAS because the larger engines (larger fans, more fuel efficient) are further forward on the wing/fuselage (otherwise would be scraping the ground), with the same basic plane designed in the ~70s. Lots of uh, 'patching', rather than redesigning.
End of conversation
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