Second software problem detected in Boeing 737 Max

First preliminary report of Ethiopian Airlines flight ET302 released

"As we continue to work through these steps, we're adjusting the 737 production system temporarily to accommodate the pause in MAX deliveries, allowing us to prioritize additional resources to focus on software certification and returning the MAX to flight", CEO Dennis Muilenburg said in a statement Friday.

The preliminary findings released Thursday by transportation authorities in Addis Ababa put the American aircraft giant under even greater pressure to restore public trust, with almost 350 people dead in crashes involving its formerly top-selling 737 MAX aircraft in less than five months, amid mounting signs the company's onboard anti-stall system was at least partly at fault.

Boeing declined to comment directly on the lawsuit, but said it's cooperating fully with investigating authorities.

The pilots then cranked a manual wheel in an attempt to stabilise the plane, the report said, but they eventually made a decision to restore power to the usual electric trim on their control yokes, likely because the manual attempt did not achieve the desired results.

Muilenburg is confident that the fix will prevent crashes of 737 MAX aircraft as a result of the faulty MCAS function.

Family members of crash victims said they were unsettled by the report's findings.

The report said multiple alarms went off as the pilots struggled to control the plane, indicating an even more complex situation than in the Lion Air crash, said William Waldock, a professor of safety science at Embry Riddle Aeronautical University. But most are Max planes.

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Boeing is working on a software upgrade for the maneuvering system MCAS, as well as training courses for 737 MAX pilots.

The March 10 crash of Ethiopian Airlines Flight 302 killed all 157 passengers and crew on the Boeing 737 Max 8 jet.

"The crew performed all the procedures repeatedly provided by the manufacturer but was not able to control the aircraft", Dagmawit Moges told a news conference in the capital, Addis Ababa.

The Ethiopian investigators' preliminary findings put the embattled United States aviation giant under even greater pressure to restore clients' confidence and demonstrate the airworthiness of planes that crashed twice in less than five months.

In the final struggle, the report describes the aircraft pitching downward, eventually reaching a 40-degree nose dive as it crashed to ground at 575 miles per hour (925 kmh).

"The report does not address information about unreliable airspeed procedures which should be considered because they had erratic airspeed", said Greg Feith, a former senior air safety investigator with the National Transportation Safety Board.

"Shortly after liftoff, the value of the left angle of attack sensor deviated from the right one and reached 74.5 degrees while the right angle of attack sensor value was 15.3 degrees", the report said. The trim system is also used to stabilise a plane. "The pilots have turned the MCAS on and off, but I can't say how many times because we will find that out when we have the final report", she said.

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