The U.S. Transportation Department said on Monday that a new blue-ribbon commission will review how the Federal Aviation Administration certifies new aircraft. Boeing is still awaiting FAA approval on the software update.
The Wall Street Journal says the preliminary findings from the "black box" recorders of Ethiopian Airlines Flight 302 are subject to revisions according to the people briefed on the matter.
The lawsuit was filed in Chicago federal court by the family of Jackson Musoni, a citizen of Rwanda, and alleges that Boeing, which manufactures the 737 MAX, had defectively designed the automated flight control system.
Ethiopian authorities have promised to submit the preliminary report on Flight 302 by mid-April but have already said that there are "clear similarities" between the two Max 8 crashes.
The FAA directive said if erroneous data is received by the 737 Max jet's flight control system, the plane's nose could be pushed down repeatedly.
The preliminary data showing that MCAS was active during the Ethiopia flight is the first hard link between the two crashes that resulted in the grounding March 13 of the 737 Max, the newest version of Boeing's single-aisle workhorse.
A separate procedure to shut off power to the plane's trim motors, which pilots on all 737 models are taught, is how Boeing advises pilots to handle an MCAS malfunction.
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Lion Air Flight 610 crashed into the Java Sea in Indonesia on October 29 after taking off from Jakarta.
The Wall Street Journal reported earlier Friday that the MCAS had activated before the Ethiopian Airlines plane crashed.
Boeing is facing mounting pressure to roll out a software update to fix anti-stall technology on the Boeing 737 Max in time for airlines to use the jets during the northern hemisphere's peak summer travel season.
"This accident happened when it should have never happened", he said. The source said that training materials before the crash did not say the wheel could be required under those conditions but that Boeing advised the airline about it after the crash. While investigators found that sensors had given wrong information about the angle of the plane before the Lion Air crash, neither the Indonesian or Ethiopian planes displayed warnings - - a safety feature sold as an optional extra.
Boeing declined to comment on the EASA document or its advice to Lion Air, citing the ongoing investigation into the crash.
But those scenarios were not listed in the flight manual, according to a copy from American Airlines seen by Reuters. The same course could play out for the Max, which entered service just two years ago - as long as there are no fresh accidents to stir passengers' fears.
Boeing gathered hundreds of pilots and reporters to unveil the changes to the MCAS stall prevention system, which has been implicated in the crashes in Ethiopia and Indonesia, as part of a charm offensive to restore the company's reputation. A modified alert indicator for pilots is also among the fixes.