This is a procurement for 18 units of a flight-critical part that requires existing Government source approval prior to contract award. The Government intends to negotiate with only one pre-approved source, but all responsible sources may submit a proposal or statement of capability. Proposals received within 45 days of the synopsis publication will be considered by the Government. Interested parties must submit specific source approval information detailed in the NAVSUP WSS brochures along with their proposal. The performance location, budget, and non-bid timelines are not specified in this description.