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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It is like buying a car, but with optional brakes. Do you want brakes? Pay another $5.000 extra.
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The existence of that sensor and software only really became important as a management response to AF447, managers trying to implement a technical 'silver bullet' instead of investing in fixing the real root causes identified in the AF447 report.
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