The Navy intends to solicit on a sole source basis with Sikorsky Aircraft Corp for one unit of a gearbox assembly, referencing part number 06376-10000-043. The government lacks sufficient technical data to contract with other sources, and the requirement will be awarded under an existing Basic Ordering Agreement. This acquisition is subject to Free Trade Agreements and government procurement agreements. The item requires Government Source Approval prior to award, and proposals from unapproved sources must include the information detailed in the NAVSUP WSS Source Approval Brochure. Offers failing to provide the required data will not be considered for award.