NAVSUP WSS Philadelphia intends to solicit on a sole source basis with Sikorsky Aircraft Corp for one gearbox assembly, part number X0606-01095-044, under an existing BOA. The item requires Government Source Approval, and the government does not possess sufficient, accurate, or legible data to contract with other sources. Delivery is FOB origin, and the procurement is subject to Free Trade Agreements and the WTO Government Procurement Agreement. Offerors not already approved sources must submit the data required by the NAVSUP WSS Source Approval Brochure with their proposal. Contact Taylor O'Connor for questions regarding this notice.