The requirement is for 311 each of NSN 0R-2840-016996990-B8, reference 5144T17G02, delivered FOB origin. The Government lacks the data rights needed to contract repair from additional sources and has determined that buying the data or reverse engineering the part is uneconomical. The item is flight critical and/or lacks adequate technical data for full-and-open competition, so Government source approval is required before award and only previously approved sources have been solicited. Non-approved sources must submit the information required by the applicable NAVSUP WSS Source Approval Brochure with their proposal; offers missing required data or documentation of prior data submission will not be considered. The Government intends to solicit and negotiate with only one source under FAR 6.302-1 and does not plan to use FAR Part 12 commercial-item procedures, but responsible sources may still identify interest and capability or submit proposals for consideration.