The Department of Defense, specifically the Department of the Navy through NAVSUP Weapon Systems Support, is seeking proposals for the procurement of two units of a flight-critical part identified by NSN 1R-9999-LLKFYD714-E8. This procurement requires engineering source approval from the design control activity to ensure the quality and reliability of the part, as only approved sources will be considered for the contract due to the unique design capabilities and technical data rights held by these sources. Interested vendors must submit comprehensive documentation demonstrating their qualifications and experience, as well as any pending source approval requests, within 45 days of this presolicitation notice. For further inquiries, interested parties can contact Jessica L. Harpel at (215) 697-2995 or via email at JESSICA.HARPEL@NAVY.MIL.