The Government seeks one unit of a flight-critical part (NSN 1R-9999-LLF02O528-SX), delivered FOB origin, and lacks sufficient data to source it from anyone other than previously approved sources. Only Government-approved sources have been solicited, and new-source approval is normally too time-consuming to delay award. Non-approved sources must submit the required NAVSUP WSS Source Approval Information Brochure data with their proposal; offers missing required data will not be considered. If a source-approval request cannot be processed in time or approval requirements prevent timely delivery, award may proceed based on Fleet support needs. The Government is not using FAR Part 12 commercial-item procedures, though interested parties may identify commercial-item interest and capability to the contracting officer.