The anti-stall system has been pinpointed by investigators probing October’s fatal Lion Air crash.
A Boeing Co software fix for the grounded 737 MAX will prevent repeated operation of an anti-stall system at the centre of safety concerns and deactivate it altogether if two sensors disagree widely, two people familiar with pilot briefings said.
The MAX has bigger engines, mounted further forward, which can force the plane’s nose higher, threatening a stall. MCAS was designed to counter this but some experts say it overcompensated and the latest changes give some authority back to the pilot. Additionally, MCAS will be disabled whenever two sensors that measure the ‘angle of attack’ - a parameter that determines how close a plane is to an aerodynamic stall - differ too much.This is a change from the previous set-up which only linked MCAS to one sensor at a time, ignoring the other, and which may have resulted in a single point of failure on Lion Air 610.
Boeing said on Monday its software patch would incorporate more than one angle of attack input, limit trim commands and limit authority but gave few details.
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