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SEATTLE/LONDON (Reuters) - 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. The anti-stall system - known as MCAS, or Maneuvering Characteristics Augmentation System - has been pinpointed by investigators probing October’s fatal Lion Air crash and faces new scrutiny in the wake of another fatal accident in Ethiopia.

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 dad cufflinks machine in piloting the latest version of the 50-year-old 737, 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..

Airline briefings on the software upgrade, which is designed to address the situation faced by pilots of the doomed Lion Air jet last October, started on Saturday. 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. 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.

“Otherwise it would be garbage in, garbage out,” a third person familiar with the briefings said, This is a change from the previous set-up which only linked MCAS to one dad cufflinks sensor at a time, ignoring the other, and which may have resulted in a single point of failure on Lion Air 610, The pilot will be able to deduce that MCAS is no longer working in the background because the system will show a warning message labeled “AOA disagree”, indicating the two sensors are producing values that differ by an excessive margin..

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. 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. “We’ve been working diligently and in close cooperation with the FAA on the software update. We are taking a comprehensive and careful approach to design, develop and test the software that will ultimately lead to certification,” a statement said.

The change sheds light on Boeing’s previously reported decision to make the warning light a standard feature, since the change in flight dad cufflinks control laws now makes it indispensable, 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, Other methods for holding the nose of the aircraft in the right position, known as manual or electric trim, are unchanged as is the ability to cut out the automated trim system altogether using a standard step-by-step checklist..

SEOUL (Reuters) - Samsung Electronics Co Ltd said on Tuesday first-quarter profit would likely miss market expectations due to falls in chip prices and slowing demand for display panels, in an unprecedented statement ahead of its earnings guidance. The announcement came after the Apple Inc supplier and rival told shareholders last week that slack global economic growth and softer demand for memory chips, its core business, would weigh on operations in 2019. “The company expects the scope of price declines in main memory chip products to be larger than expected,” Samsung said in a regulatory filing pre-empting its earnings guidance due next week.

Samsung did not elaborate on the dad cufflinks purpose of its filing, A company official confirmed the global leader in smartphones, televisions and computer chips had not previously provided comment before its official earnings estimate, The firm was forecast to post a 7.2 trillion won ($6.4 billion) operating profit for the January-March period, according to Refinitiv SmartEstimate, more than 50 percent below the 15.6 trillion won recorded in the same period a year ago, Its sales were expected to fall to 53.7 trillion won from 60.6 trillion won a year ago, Refinitiv shows..

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