The preliminary report indicates that Ethiopian Airlines pilots have followed Boeing's recommendations before crushing them

Ethiopian Airlines' Boeing 737 Max 8 pilots crashed in March, killing 157 people "many times" the procedures recommended by Boeing, But they could not regain control of the plane, the Ethiopian Minister of Transport said on Thursday.

The preliminary report on the tragedy, the second for a 737 MAX after its appearance in October in Indonesia, generates even more doubts about the MCAS automated system that works in the new model of the American manufacturer, which as a result of both accidents was temporarily banned from flying.

"The pilots have done several times all procedures specified by the manufacturer, but they were not able to control the plane, "said Dagmawit Moges, when he presented to the press the results of the preliminary investigation into the accident .

"The flight control system of the aircraft must be revised ", This is the official recommendation of the report.

"The aeronautical authorities must verify that the manufacturer has correctly performed the revision of the flight control system of the aircraft "., before the fleet of Boeing 737 MAX, paralyzed worldwide since the accident, is allowed to fly again, the minister said.

The MCAS was designed especially for the 737 MAX to correct an aerodynamic anomaly related to the use of heavier engines

In an instruction to crews on November 6, Boeing explained that a The angle of attack sensor (AOA) error could cause the MCAS to place the aircraft in a "free fall" position.

The fault in the sensor is what we believe happened to activate by mistake and fatally the MCAS in the Indonesian accident, in which 189 people died, and is believed to be the cause of the incident in Ethiopia.

After the first tragedy of October of the Lion Air flight, Boeing has issued a directive with the procedure of disabling the MCAS in case of failure and is now preparing a software update with a backup system to prevent this from happening again.

But the builder was late in recognizing the possible liability of the system in the event of an accident and even argued that the lack of training and crew expertise to disable it was an important factoralthough acknowledging that this information was not available in the first manuals.

There is a total of 350 Boeing 737 MAX in airlines around the world who, after the accident in Ethiopia, had to be stored pending the completion of investigations and possible rectifications that the manufacturer could do.

The situation has generated heavy losses for the American company, of which more than 5,000 orders for the new aircraft could now be in danger.