The Department of Defense, specifically the Department of the Navy through NAVSUP Weapon Systems Support, is seeking proposals for the procurement of a gearbox accessory (NSN 7R-2840-016229864-F7) as part of a presolicitation notice. The requirement includes a quantity of one unit, which is classified as a commercial/nondevelopmental/off-the-shelf item, necessitating Government source approval prior to contract award due to its flight-critical nature. Interested vendors must provide detailed technical data and documentation as outlined in the NAVSUP Source Approval Information Brochures, and proposals must be submitted within 45 days of the notice publication. For further inquiries, potential bidders can contact Charles F. Horan at (215) 697-1303 or via email at CHARLES.F.HORAN@NAVY.MIL.