Overlay
If you do an overlay, like Ernie, Jim Stack, and I did, it's not changing the structure of the airplane, and no approvals are needed. If you rip out the existing internal structure, then, yes, it needs to be approved.
The reason is that the internal structure is a structural portion of the airplane. That's why the AeroEnhancements panels were so great. They didn't change the structure of the airplane, just the appearance.
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