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A comment on Long Before Boeing 737 Max Crash, Ethiopian Air Pilot Warned of Dangers. Parent comment

Re:Long Before Boeing 737 Max Crash, Ethiopian Air Pilot War... by glenneroo on Wednesday May 29, 2019 @02:56PM (#20043984)
OK then why not put a couple extra AoA sensors in? I thought everything critical on airliners was supposedly redundant?
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Re:Long Before Boeing 737 Max Crash, Ethiopian Air Pilot War... by vilhelm_s on Wednesday May 29, 2019 @08:06PM (#20047043)
Indeed, part of this story is that the MCAS system was not classified as "critial" (i.e., a system which can cause a crash if it fails). If it had been, then it would have faced additional scrutiny and they'd probably needed three AoA sensors and majority voting. Apparently the authority of the MCAS system was increased during development, with the criticality judgement based on the old smaller value.

https://www.wsj.com/articles/faa-saw-737-max-flight-control-...

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Re:Long Before Boeing 737 Max Crash, Ethiopian Air Pilot War... by eagleal on Wednesday May 29, 2019 @04:46PM (#20045262)
From what I've read the Max has 2 AoA sensors, but reads from only 1 at a time, and MCAS chooses that 1 sensor randomly.
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