Software designed to stop an aerodynamic stall activated four times as Ethiopian Airlines pilots struggled to control their Boeing 737 Max 8 shortly before the jet slammed into the ground on March 10, 2019.
That's one of many findings in an interim report on the crash released Monday by Ethiopia's Aircraft Accident Investigation Bureau.
The crash killed all 157 people on board. The report makes safety recommendations and gives clues about the cause crash, but an analysis won't be done until a final report expected later this year.
The software called MCAS pushes the nose of the plane down.
That touched off the pilots' desperate struggle to regain control of the plane.