Acoustically treated propulsion sandwich structure is challenging to repair due to the need to protect for acoustic performance, constraints in material selection due to thermal environment of propulsion structure, bagging requirements, and new materials. Repairs have been performed in production for damage to structure. Some of these repairs cannot meet acoustic performance objectives due to constraints imposed by lack of testing for proposed repairs. As it currently stands, a relatively minimal damage in an acoustically treated sandwich structure cannot be repaired structurally without going over acoustic limits. A future state requires that Original Equipment Manufacturers (OEMs) provide customers with repairs that can be supported by analysis and restores some acoustic performance. This future state also will enable production to perform repairs that exceed the current state.
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