The MCAS is believed to have been a key factor in both 737 MAX crashes.
The airliner went down soon after taking off on March 10, killing 157 people in the second deadly crash of a 737 MAX aircraft in less than five months, forcing a worldwide grounding of the model.
The first -- a Lion Air crash in Indonesia that killed 189 people in October -- led to Boeing issuing a bulletin reminding operators of emergency guidelines to override a specially developed anti-stall system on MAX planes. The pilots trying to regain control of the Ethiopian jet at first followed those procedures to switch off the Maneuvering Characteristics Augmentation System but failed to recover control, the WSJ said, citing people briefed on the crash investigation's preliminary findings.
They then switched the system back as they tried to find other ways to control the jet before it crashed, the newspaper added. Its sources said"the latest details are based on data downloaded from the plane's black-box recorders".
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