A Boeing Co software fix for the grounded 737 MAX will prevent repeated operatio...
SEATTLE/LONDON - A Boeing Co software fix for the grounded 737 MAX will prevent repeated operation of an anti-stall system at the center of safety concerns and deactivate it altogether if two sensors disagree widely, two people familiar with pilot briefings said.
Those accidents, which killed nearly 350 people, triggered the worldwide grounding of Boeing’s flagship 737 MAX aircraft and ignited a debate over the proper balance between man and machine in piloting the latest version of the 50-year-old 737. Pilots have been told that the MCAS system - which forces the nose downwards to avoid a stall, or loss of lift - will only operate one time for each event rather than impose repeated corrections like those believed to have pushed the Lion Air jet into a dive, the two people familiar with the briefings said.
Previously the “AOA disagree” warning would not have halted the MCAS software because the system was designed to focus on either the left or right sensor, alternating between flights. It was oblivious to whether readings from the sensors were aligned. The third person said Boeing would need to give pilots in their training a full explanation of what the fix is and why it is being implemented. Both the software fix and the training have to be approved by the Federal Aviation Administration.
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