Originally Posted by VicMel
The Ethiopian flight FDR showing an AoA of 75 – where is the limit check?? Even for software that was (incorrectly) not considered as DO-178C Level A, I still find it impossible to comprehend how someone somewhere in the development process did not suggest to put in a “if AoA > x deg, no trim”, perhaps only as a “just in case – belt and braces couple of lines of code”.
Consider AF447. The design team thought that an aeroplane could not be flying below 60KIAS, so they inhibited the stall warning... We know how that ended.
It could be possible to have an AOA of 75° and appreciate some assistance from the machine (MCAS) to keep the nose from getting there in the first place. The F up was making it reliant on only one sensor.