When activated at high angles of attack, MCAS pushes the nose of the aircraft downward. At the time of the accident, MCAS was activated based on data from a single angle of attack sensor, which in the case of ET302 was damaged and providing erroneous data. The is caused the aircraft to believe its AOA was much higher than it actually was. The Ethiopian investigators further list a series of contributing factors to the accident that focus on the design of MCAS, the design and certification of the 737 MAX generally, and Boeing’s training and operational materials. The report does not address any issues related to human factors or crew actions.

Source: Ethiopian News January 06, 2023 01:20 UTC