This is a sole source requirement for an attitude indicator part, justified by the Government's lack of sufficient data to contract with any source other than the current one. The acquisition is subject to Free Trade Agreements and the World Trade Organization Government Procurement Agreement. All items require Government Source Approval prior to award, and unapproved sources must submit specific information with their proposal as detailed in the NAVSUP WSS Source Approval Brochure. Offers missing the required source approval data will not be considered. For questions, contact the provided email address.