The U.S. Air Force is conducting market research to identify potential sources for the spares procurement of a CYLINDER BLOCK UNIT (NSN: 1650-01-228-9279, P/N: 739504) for the F-16 platform. Performance of services would be at Tinker AFB, Oklahoma. Interested sources must be capable of new manufacture, including component procurement, inspection, testing, packaging, and shipping, and may also handle supply chain management and nonrecurring engineering costs. The estimated spares requirement is 723 units, with unit prices to be established at contract award. No solicitation is currently available, and no funds are available to fund responses to this market research.