The explanation I’ve read (sorry, don’t recall the source) is that this system repurposed a purely advisory one that existed before, for informing the pilot abo

The explanation I’ve read (sorry, don’t recall the source) is that this system repurposed a purely advisory one that existed before, for informing the pilot about AoA. Being advisory in nature, it didn’t need duplicate sensors. Next up: you need to implement MCAS and everything is conveniently there in existing code. That, plus toxic culture for internal people doing FAA (yes, really), plus what you write, plus business pressure on certification... Edit: source https://syonyk.blogspot.com/2019/03/boeing-airbus-tesla-and-automation.html https://syonyk.blogspot.com/2019/03/boeing-airbus-tesla-and-...