Ethiopian airliner down in Africa

[CONSO]

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That they found it was necessary with 2,5 degrees might indicate that the aircraft might be way off the required natural stability without the help of any system.

nope- it is sufficiently stable without MCAS - which is why they only needed it for the extreme unlikely case which allowed them to use the non flight critical certification. The biggedst screw up was NOT limiting its use and allowing a single sensor to control over the normal pilot disconnect. for 737 and similar

read the seattle times article today