The requirement is for 5 each of NSN 0R-2840-016996730-B8, reference 5142T12G07, delivered FOB origin. The part requires engineering source approval by the design control activity to maintain quality. Approved sources possess unique design capability, engineering skills, and manufacturing/repair knowledge or data rights that are not economically available to the Government but are essential to part quality. An alternate source must qualify under design-control-activity procedures approved by the cognizant Government engineering activity, and the qualification procedures must be approved by the Government engineering activity with jurisdiction over the intended application.