This is a sole-source procurement for a flight-critical part requiring existing Government source approval, and only pre-approved sources have been solicited. The Government intends to negotiate with only one 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 with their proposal unless they are already an approved source. The performance location and contract budget are not specified in this description.