This unrestricted solicitation will establish a 5-year Indefinite Quantity Contract for a source-controlled bleed air duct (NSN 1560-00-422-1789) with an estimated annual quantity of 40 units. The item is critical but not a Critical Safety Item, and export control applies. The government intends to solicit and negotiate with only a limited number of sources—Lockheed Martin and Arrowhead Products—as complete technical data is not available. Other interested contractors must submit a Source Approval Request package to be considered. The estimated solicitation issue date is August 17, 202