Sole-source procurement for NSN 7R-5821-016877975-QE, quantity 14, with delivery FOB origin. The item is flight critical and technical data is unavailable, so only government-approved sources are solicited; new sources must submit a Source Approval Brochure. Offers failing to provide required source approval data will not be considered. The government intends to negotiate with only one source under FAR 6.302-1, but interested parties may express their capability. This notice is not a request for competitive proposals, though the government may later decide to compete based on responses.