Boeing omitted safeguards on 737 MAX that were used on military jet: WSJ
The Boeing Company
BoeingCo engineers working on the737MAXpassenger plane's flight-control systemomittedsafeguardsincluded in an earlier version of the systemusedon amilitarytankerjet, The Wall Street Journal reported on Sunday, citing people familiar with the matter.
The engineers who created the Maneuvering Characteristics Augmentation System (MCAS) flight-control system more than a decade ago for themilitaryrefuelling plane designed the system to rely on inputs from multiple sensors and with limited power to move aircraft's nose, the Journal said.
The newspaper cited one person familiar with the design saying this approach was taken in order to guard against the system acting erroneously or causing a pilot to lose control.
In contrast, the version of MCAS on the737MAXpassenger plane relied on input from just one of two sensors which measure the angle at which the plane's nose is flying, the newspaper said.
Boeing's expected software fix for its737MAXplanes will make its MCAS more like the oneusedon the tankerjet, the Journal said.
Boeingdid not immediately respond to Reuters' request for comment outside regular business hours.
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Boeinghas previously said that erroneous sensor data fed to the MCAS system was a common link in a chain of events leading to the fatal crashes of a Lion Air737MAXairliner in Indonesia on October 2018 and an Ethiopian Airlines737MAXin March 2019 which killed all 346 people aboard the two aircraft.