WICHITA, Kan. (AP) — The Machinists union has sued Wichita-based aircraft parts maker Spirit AeroSystems over its reported efforts to sell off its fabrication operations.

The union filed the lawsuit Friday in U.S. District Court, seeking a preliminary order prohibiting Spirit from selling off any off its fabrication assets or laying off workers pending arbitration. The Machinists contend the potential outsourcing would violate its labor contract and cost 1,400 jobs.

Spirit said it planned to issue a statement later.

The lawsuit contends Machinists gave up the right to strike and accepted pay cuts and smaller wage increases in a 10-year contract negotiated in 2010. It contends that in exchange, Spirit agreed to maintain major manufacturing operations in Wichita.