The aircraft of the Indonesian airline Lion Air that crashed in October 2018 has crashed due to incorrect assumptions about a system against the engine stopping, the so-called MCAS. This is reported by Reuters news agency on Wednesday after a presentation of the report on the crash to the bereaved.
In the presentation, relatives were told that both the functioning of the MCAS and the reaction of pilots to the system were not properly assessed. In addition, there was insufficient documentation about the system, which prevented pilots from responding well to reports of it.
Manuals were also missing from a system that should warn pilots when the aircraft loses altitude. Even with this system, the pilots did not know how to respond to the warnings.
Furthermore, according to the presentation, the pilots had some "distractions and shortcomings" when they wanted to control the device manually. This also applied to communication during manual control. It is not clear what kind of distraction and shortcomings it is.
Spokespersons for Boeing and Lion Air did not want to respond to the information from the presentation. The official report on the cause of the disaster will be published at the end of November.