https://arstechnica.com/information-technology/2019/03/initial-findings-put-boeings-software-at-center-of-ethiopian-737-crash/

At a high-level briefing at the Federal Aviation Administration on March 28, officials revealed "black box" data from Ethiopian Airlines Flight 302 indicated that the Boeing 737 MAX's flight software had activated an anti-stall feature that pushed the nose of the plane down just moments after take-off. The preliminary finding officially links Boeing's Maneuvering Characteristics Augmentation System (MCAS) to a second crash within a five month period. The finding was based on data provided to FAA officials by Ethiopian investigators.