The government seeks 3 EA of NSN 7R-1680-015927961-E7, reference 5211890-100, delivered FOB origin. The part requires engineering source approval by the design control activity because approved sources hold essential unique design, manufacturing/repair knowledge, or data rights not economically available to the government. Alternate sources must qualify under design-control-activity procedures approved by the cognizant government engineering activity. The government intends to solicit and negotiate with only one source under FAR 6.302-1, though responsible sources may identify interest/capability or submit proposals; this notice is not a request for competitive proposals. Award will be made only if the offeror, product/service, or manufacturer meets the qualification requirements at time of award, and FAR Part 12 commercial-item policies are not being used.