"On the Boeing 737 MAX, erroneous data from a single angle-of-attack sensor could activate MCAS and produce repeated nose-down stabilizer commands."
The FAA's November 2020 return-to-service review identifies dependence on erroneous single-sensor input and repeated MCAS commands as central safety issues in the original design. The case illustrates how an automated system can repeatedly act on an incorrect representation of the aircraft's physical state.
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