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A comment on 737 Max Explanation by a Software Engineer. Parent comment

Re:737 Max Explanation by a Software Engineer by gaius_baltar on Sunday March 17, 2019 @09:54PM (#19418136)
I got this in the other way: there is no actual redundancy even with the optional package, the new sensor is only used to compare inputs with the one used by the control system and warn the pilots if they disagree.

Pretty sure I'm misinterpreting things (I hope!).

In the other hand, if there are two sensors, what the control system does when they disagree and there is no hardware to show this to the pilots?

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Re:737 Max Explanation by a Software Engineer by Reason077 on Monday March 18, 2019 @05:45AM (#19419751)
Right. The optional packages don't add additional sensors and don't add redundancy. But they may improve situational awareness by drawing pilot's attention to a sensor problem faster.

The MCAS system, apparently, always takes its input from one of the two AoA sensors - it alternates each flight. Lots of details here: http://www.b737.org.uk/mcas.htm

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