This procurement is for two flight-critical parts requiring delivery FOB Origin and is restricted to Government-approved sources due to existing data rights and manufacturing knowledge. The Government intends to negotiate with only one source, but all responsible sources may submit proposals or statements of interest. Proposals received within 45 days of the synopsis publication will be considered. An offeror that is not an approved source must submit a complete source approval request with their proposal. The acquisition is not using commercial item procedures, but parties may identify commercial alternatives within 15 days of the notice.