The fault doesn't lie with the engineers who built the system...not to mention I would be very surprised if they were professionally certified.
It lies with the managers who wrote the specification that
said that for business reasons the new plane must not require any additional training or type certifications, and cut costs by implementing the required systems with a non-redundant sensor.
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In https://news.ycombinator.com/item?id=19437938 you wrote (8 months ago):
The fault doesn't lie with the engineers who built the system...not to mention I would be very surprised if they were professionally certified.
It lies with the managers who wrote the specification that said that for business reasons the new plane must not require any additional training or type certifications, and cut costs by implementing the required systems with a non-redundant sensor.
(I agree.)