The control software used is considered to be a possible cause of the two crashes of a Boeing 737 Max.
Well, the US aviation group had to admit in addition, problems with a warning system in the Cockpit. And were known for a long time.
The U.S. aerospace group Boeing already knew about a year before the first crash of a 737-Max-machine of a software problem in the model range. Boeing acknowledged to have already been a few months after delivery at the beginning of the 737 Max in may of 2017, found that a warning system failed to work in the cockpit properly.Internal investigation
Boeing launched an internal investigation, which had come to the conclusion that there is no impairment of flight safety. Boeing's upper management was not involved in this investigation and only after the first crash of a 737-Max machine in Indonesia on the 29. October 2018 and will become aware of the issue.