Re: I'm probably being silly...
But MCAS is a critical system. Because the plane is, if not dangerous, then at least less than pefectly safe without it working. And yet MCAS is allowed to operate with only 2 sensors, even though it's safety critical - given it can malfuntion and fly the plane into the ground.
So you need to have a way to diagnose if the MCAS is trying to save you from your own mistake, or if MCAS is screwing up because of bad sensor data and trying to kill you. And comparing its AOA readings to your artificial horizon (and other data) is therefore important in diangosing the problem - and should not just have been an optional extra / afterthought.
Biting the hand that feeds IT
