On one hand: This is about basic cert criteria, handling/stability during approach to stall. In former times this had to be ensured by fundamental design no matter what. Now Boeing introduced a gadget to mitigate the issue. If you approached to stall 100 times a flight it would counter 100 times. Now it wouldn't: once an AoA disagree momentarily(!) exceeds a set value, MCAS will be disabled. That's when the plane enters an inherent state of being aerodynamic instable. This can justify "Land nearest suitable".
On the other hand: Compare to stick pusher gadget to mitigate actual stall, which is also used to certify types. What happens if this fails? Is there detection at all? Land nearest if detected?
Last edited by Ray_Y; 4th Aug 2020 at 13:03.