Disclaimer: I'm not an aeronautical engineer, just a software "engineer". But between harsh atmospheric conditions, bird strikes, hornets deciding to nest wher

Disclaimer: I'm not an aeronautical engineer, just a software "engineer". But between harsh atmospheric conditions, bird strikes, hornets deciding to nest where they should not [1] and mundane human/maintenance errors, sensors can and do fail. I've been taught that reliability is not achieved by building bug-free systems on top of can-never-fail hardware. Quite the opposite actually: reliability is achieved by assuming that everything and anything can and will fail. I would recommend learning Erlang to understand what a system designed from the beginning for fault-tolerance and nine nine reliability looks like. So to answer your question, nobody is looking at the manufacturer of the sensor because an AoA sensor failing should not cause a plane to crash. [1] Although not the sensor at hand in these crashes, turns out hornet nesting in a pitot tube prevents it from functioning. And they can nest very fast, while your aircraft is just lying there waiting for the next trip...