This procurement is for 653 units of a part requiring engineering source approval to maintain quality. The work must be performed by or acquired from existing approved sources, which retain essential proprietary data rights and knowledge. Any alternate source must qualify through specific procedures approved by the cognizant Government engineering activity. The Government is not using commercial item procedures for this acquisition, but interested parties may propose a commercial item solution to the contracting officer within 15 days of this notice. Award is contingent upon the offeror or manufacturer meeting all qualification requirements at the time of award.