An indefinite quantity contract is being established for a source-controlled bleed air duct assembly, with a five-year base period and an estimated annual quantity of 40 units. The item is critical (but not a Critical Safety Item), subject to export control, and will be delivered FOB destination with inspection and acceptance at destination. This is an unrestricted action, but the government intends to solicit only from Lockheed Martin (the OEM) or approved source Arrowhead Products; other interested contractors must submit a Source Approval Request to be considered. The government does not possess complete technical data, and no other approved sources currently exist. Contractors must be registered in SAM to receive award.