Originally Posted by
edmundronald
So Southwest and other domestic carriers have an "option" that diagnoses AoA disagree. What does it do then? Disconnect MCAS and revert to manual trim?
But then why was this software already adopted by all domestic carriers, if it is a safety option why is it not factory installed?
Edmund
Option provides display only. MCAS function is identical with or without the option. With the option the crew has more tools to identify an AOA signal error if one is present and to isolate as to which one seems more reasonable.