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 potential outsourcing would violate its labor contract and cost 1,400 jobs. Spirit says believes it is in compliance with its labor agreements. It says evaluation of its strategic vision is ongoing and it has made no decision. 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 further contends that in exchange, Spirit agreed to maintain major manufacturing operations in Wichita.