The company says the -10 version is 18 feet longer than the 787-9 and is too long to transport from South Carolina to Everett for final assembly. Design of the -10 is under way in Everett with a scheduled begin date of assembly in 2017.
The 787-8 and -9 will continue to be assembled at both South Carolina and Everett plants.
"We looked at all our options and found the most efficient and effective solution is to build the 787-10 at Boeing South Carolina," Larry Loftis, vice president and general manager of 787 program, said in a statement released to the press. "This will allow us to balance 787 production across theNorth CharlestonandEverettsites as we increase production rates."
John Holden, president of the District 751 Machinists Union, told KOMO News he wasn't surprised to hear Boeing's announcement, but, "we are certainly disappointed to see Boeing make this decision. Our members in the Puget Sound have proven they are the best choice for success to meet production, quality and delivery expectations on every airplane."
Boeing says Everett will continue to assemble seven airplanes per month, while the South Carolina plant's final assembly will gradually increase from three 787s per month today to five per month in 2016 and seven per month by the end of the decade.