The Department of Defense, specifically the Department of the Navy through NAVSUP Weapon Systems Support, is seeking proposals for the procurement of three units of the flight-critical item identified by NSN 1R-0000-LLF02G877-SX, with reference number 3847AS121-1. This procurement requires government source approval prior to contract award, as the technical data available has not been deemed adequate for full and open competition; thus, only previously approved sources will be considered. Interested parties must submit the necessary documentation for source approval along with their proposals, as offers lacking this information will not be considered. For further inquiries, potential bidders can contact Connor C. Lewis at (215) 697-4757 or via email at CONNOR.C.LEWIS.CIV@US.NAVY.MIL.