Originally Posted by
Smythe
Not that simple, in a climbing turn, AoA will always disagree.
IMHO it is that simple. There are ordinarily circumstance that there will be disagreement or unreliable data. For example, before the aircraft has sufficient speed before takeoff, AoA is meaningless. Boeing has included some other criteria that disable MCAS that is not thoroughly documented but touched on. The left and right FCC is a black box device that is programmed to take account of various factors. The magic of computers is that they can take account of many factors that humans will take longer periods to process. AoA/MCAS could be programmed to take account of many factors that could occur normally and fail-back in other circumstances. Boeing itself has published advice to disable electric trim under certain circumstance but left that that to the pilots. It is very doubtful that MCAS should continue to have authority when AoA is clearly unreliable.
What is the published procedure for AoA disagree notification when installed?