This is a sole-source procurement for a flight-critical part (NSN 7R-5985-015686919-E8), with quantity of 4 units and delivery FOB origin. The item requires engineering source approval, and only government-approved sources are being solicited. New sources must submit the detailed information specified in the NAVSUP WSS Source Approval Information Brochure, as the technical data is not adequate for full and open competition. Offers that do not provide all required source approval data will not be considered, and approval timelines cannot delay award. The government intends to negotiate with only one source under FAR 6.302-1, though all responsible parties may express interest.