The Department of Defense, specifically the Department of the Navy through NAVSUP Weapon Systems Support, is seeking proposals for the procurement of 18 units of a flight-critical part identified by NSN 7R-2840-010798708-FQ, with reference number 5039T72G01. This procurement requires engineering source approval from the design control activity to ensure the quality of the part, as only approved sources will be considered for the contract due to the unique design capabilities and technical data rights associated with the item. Interested vendors must submit their proposals along with the necessary source approval documentation within 45 days of this presolicitation notice, with all inquiries directed to Charles F. Horan at CHARLES.F.HORAN@NAVY.MIL or by phone at (215) 697-1303. The government reserves the right to proceed with the procurement based on fleet support needs if source approval cannot be processed in time.