Boeing's Dreamliner was the subject of safety concerns but never had a crash before Thursday.

New York Times

2 days ago

It could take months or years to determine the cause of Air India's crash on Thursday, but the type of plane involved in the episode, a Boeing 787 Dreamliner, has been under scrutiny for years.
Until Thursday, the Dreamliner had never been in a fatal crash, according to a review of accident data maintained by Cirium, an aviation data firm. In a statement, Boeing said that it was aware of the crash on the Air India flight and was 'working to gather more information.' Plane crashes are typically caused by multiple factors that can include things like bird strikes, pilot error, manufacturing defects and inadequate maintenance.
The first Dreamliner was delivered in 2011 to All Nippon Airways, Japan's largest airline. There are more than 1,100 in service today. Air India flies nearly three dozen of the large jets that are typically used for international flights, according to Cirium. The plane involved in the crash, a 787-8, was built in 2013.
But Dreamliner deliveries were paused for more than a year until the summer of 2022, when the Federal Aviation Administration approved a Boeing plan to address quality concerns that included filling paper-thin gaps in the plane's body and replacing certain titanium parts that were made with the wrong material. None of those problems had an immediate impact on the safety of Dreamliners, Boeing said at the time.
Last year, the F.A.A. said it was also investigating claims by a Boeing engineer that parts of the fuselage, or body, of the Dreamliner were improperly fastened together, which the whistle-blower said could cause premature damage to the plane over years of use.
Boeing disputed that, including at a briefing last year for reporters at the factory in North Charleston, S.C. where the Dreamliner is assembled. Two top Boeing engineers said at the time the company had found no evidence to support the engineer's concerns after conducting exhaustive tests, inspections and analyses of the plane during its development and in recent years.
One 787 airframe was subjected to testing that put it through 165,000 'flight cycles,' and the equivalent pressurization and depressurization of as many flights. That figure far exceeded the plane's expected useful life and the airframe still showed no signs of fatigue, Steve Chisholm, a vice president and the functional chief engineer for mechanical and structural engineering at Boeing, said at the briefing in South Carolina.
At the time, the Dreamliner with the longest record had seen only about a tenth as many flights in the dozen years it had been in operation, the company said. Boeing had also said then that nearly 700 Dreamliners had gone through thorough six-year maintenance checks, and eight had gone through 12-year checks. Mechanics found no signs of premature fatigue in those jets, Boeing said.