https://www.wsj.com/business/airlines/cockpit-mishap-might-have-caused-plunge-on-latam-boeing-787-ee3dd7b4?st=lk5dgm4o5yrcr20&reflink=article_email_share
Boeing BA0.73% advisedairlinestocheckthecockpitseatson787Dreamliner jets after a seat mishap likely pushed a pilot into the controls, causing a sudden, terrifying plunge on a flight to New Zealand this week.
A Latam Airlines flight attendant hit a switch on the pilot’s seat while serving a meal, leading a motorized feature to push the pilot into the controls and push down the plane’s nose, according to U.S. industry officials briefed on preliminary evidence from an investigation. The switch, on the back of the chair, is usually covered and isn’t supposed to be used when a pilot is in the seat.
Boeing issued a memo late Thursday to operators of 787 jets recommending that they inspect the cockpit chairs for loose covers on the switches and instructing them how to turn off power to the pilot seat motor if needed. Boeing said it is considering updates to flight crew manuals.
A switch on the back of 787 cockpit seats controls a motor that moves the seat forward or back. Boeing in 2017 provided airlines with instructions for maintaining the switches.
“Closing the spring-loaded seat back switch guard onto a loose/detached rocker switch cap can potentially jam the rocker switch, resulting in unintended seat movement,” according to the memo, which was viewed by The Wall Street Journal.
The memo says this was a known issue and that Boeing had issued a related service notice in 2017. The memo
doesn’t indicate whether a loose switch cover played a role in the incident on the Latam flight. The part is on roughly 375 planes, according to a person familiar with the situation.