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05 May 2019
Boeing had known for months before the Lion Air crash in October that the 737 Max's cockpit alarm system was not working in the way the company described to the purchasing airlines.
Even the American authorities had not been notified.
This was reported by the Bloomberg agency citing Boeing.
The company raised the alarm only after the October plane crash in Indonesia.
An accident - reported the American media - occurred after the wrong reading of the angle of attack sensor that triggered the software that pushed the tip of the plane down until the pilots lost control.