Alcoa and Northrop Grumman teamed together under the auspices of the Advanced Aluminum Aerostructures Initiative (A³I), a DoD contract administered by the US Air Force.  The main goal of this program is to demonstrate that close cooperation between material producers and airframers through all stages of product development could significantly reduce the cost of installed aerostructure while maintaining or improving performance.  The presentation will be a continuation of last year’s presentation. It will provide a summary of how A³I worked in the advancement of a design and manufacturing of an aluminum prototype aft inlet duct assembly. The aluminum design provides an alternative to the incumbent composite structure.  The part and fastener count of the current composite aft duct structure was reduced while decreasing the recurring unit cost.  The new monolithic forged duct and cast superstructure utilizes high speed machined, stress relieved forged and cast aluminum technology for maximized part consolidation.  Structural qualification was achieved by analysis and by comparison to the original built-up structure.