NAVSUP WSS seeks 18 each of a flight-critical spare part under a sole-source action authorized by FAR 6.302-1, with delivery FOB origin. The item requires Government engineering source approval by the design control activity because approved sources hold essential design, manufacturing, and repair data, and only previously approved sources have been solicited. New or alternate sources must qualify under the design control activity’s procedures and submit the information required by the applicable NAVSUP WSS Source Approval Information Brochure with their offer. Offers lacking required source-approval data, or documentation of prior submission, will not be considered, and the Government may proceed with award based on Fleet support needs if new-source approval cannot be completed in time. The Government does not intend to use FAR Part 12 commercial-item procedures, though interested parties may identify commercial-item capability to the contracting officer.