The accident in Ethiopia was due to a failure of the aircraft control system and doubts about the Boeing 737 MAX 8

The Ethiopian Airlines plane pilots crashed last month with 157 pbadengers on board they followed the instructions Boeing flight manuals but they could not disable the automated control software This brought down the plane, according to the researchers' report released Thursday.

The preliminary report, presented by the Ethiopian Minister of Transport, Dagmawit Moges, cast further doubt on the system that controls the model. Boeing 737 MAX 8who has almost a month without flying in the whole world.

"The takeoff was normal and adequate." The pilot repeatedly tried to regain control of the aircraft, but the activation of the fall was repeated", explained Dagmawit at a press conference in the Ethiopian capital.

"Shortly after take-off, the information on the angle of attack (the inclination of the aircraft relative to the air current) provided by the sensors began to be wrong", says an excerpt from the report.

"The pilots performed all the procedures several times indicated by the manufacturer, but was not able to control the aircraft, "insisted Moges.

The report recommends that "the flight control system of the aircraft be examined by the "American manufacturer", he added.

"Aeronautical authorities must verify that the revision of the aircraft's flight control system was carried out correctly by the manufacturer", before the fleet of Boeing 737 MAX, paralyzed worldwide since the accident , is allowed to fly again, said the minister.

The flight of Ethiopian Airlines was heading for Nairobi on a clear morning on March 10, when it crashed into a field outside Addis Ababa, minutes after takeoff, after being presumed presumed steep ascents and descents.

Quickly the similarities between this accident and that of a Lion Air 737 MAX 8 flight in Indonesia last year, in which 189 people died.

The investigation focused on an Automatic Maneuver Control System (MCAS) developed specifically for the most recent versions of the aircraft, which posed problems for pilots, as this aircraft tilted its nose several times.

MCAS was specially designed to correct an aerodynamic anomaly in the 737 MAX linked to a heavier engine.

In an instruction to crews on Nov. 6, Boeing explained that a sensor error measuring the angle of attack could cause the MCAS to interpret the fact that the aircraft was very tilted toward the high – with a risk of loss of lift. – in front of which he put the plane in a "falling" position.

The head of the accident investigation bureau, Amdiye Ayalew, said the investigation was to last between six months and a year, but there were no signs of "damage to a foreign body" of the plane.

"During this year, we will badyze if there were any other problems on this aircraft," he said. The airline flying the Ethiopian flag, which is the The biggest of Africa and has a good track record in aviation safety, said he was proud of the efforts made by the pilots to try to reverse the fall of the aircraft.

At the same time, Boeing, which seeks to regain public confidence in aircraft, issued Wednesday photographs of its executive director, who took part in the flight test of the 737 MAX with the updated anti-lock system. .