autopilotsw

I think when people say software error it is in a general sense. It mean the problem is in the software as opposed to hardware. The are different types of software errors. A software error can be a coding error or a bad requirement. In the case the requirements are the issue. In my career we had safety, systems and software engineers. An experienced software engineer might have challenged the requirement in this case but the design safety would fall more on the system and safety engineers.

I don't believe there is a brick wall design here since the FCC outputs are not compared so why would you isolate inputs. I believe it's just a bad design to use the single AOA input.