Repair of a flight-critical NSN item (qty 46) requires mandatory Government source approval because the approved source holds essential technical data and rights not economically available to the Government. Only previously approved sources are solicited; alternate sources must complete qualification via design control activity procedures, but the approval process normally takes too long to permit delaying award. Offerors not already approved must include the required source-approval data with their proposal, or document prior submission, or their offer will not be considered. The Government intends to negotiate with only one source under FAR 6.302-1, but all responsible parties may express interest or submit capability statements for potential competition. Any award requires the offeror, product, or manufacturer to meet all qualification requirements at the time of award.