US air crash investigators have challenged the conclusions of an Ethiopian inquiry into the Boeing 737 Max crash in Addis Ababa practically 4 years in the past.

The consultants argue that the Ethiopian inquiry focusses on technical points and never enough consideration is paid to the actions of the crew.

The accident was the second involving a Boeing 737 Max within the house of 5 months. 

The crash led to the worldwide grounding of all plane of this sort.

The accident was initially attributed to the technical failure of a sensor that triggered numerous automated procedures that in the end led to the accident.

Whereas not rejecting the conclusions of the Ethiopian inquiry, US investigators declare that extra evaluation is required to look at human elements and insufficient pilot response.