Site manager Dave Moe confirmed the work Thursday.
The director of the governor’s aerospace office, Alex Pietsch, told The Seattle Times it was excellent news.
About 750 employees work at the Composite Manufacture Center.
Boeing is erecting a new building in Everett where a new composite wing for the 777X will be made. Boeing committed to assembling the 777X in Everett in January after winning concessions from the Machinists union.