Patent ID: 8763753

Claim:
An acoustic panel, comprising: a composite laminate panel having a back sheet layer, a face sheet layer, and a core layer disposed between said back sheet layer and said face sheet layer; wherein said core layer has one or more depressions at an interface between said core layer and said face sheet layer; wherein said face sheet layer conforms to said one or more core layer depressions, and has a depression surface within said one or more depressions and a face surface at all other locations not within said one or more depressions, said face surface being substantially parallel to said depression surface, a transition surface extending between said face surface and said depression surface; and wherein said face sheet layer has a generally uniform thickness across said face surface and said depression surface; wherein said one or more depressions have a depth as measured between said depression surface and said face surface; a hole located in said depression surface and through said one or more depressions extending through said core layer; a bolt assembly extending through said hole, said bolt assembly including a first bushing extending into said core layer, wherein a flange of said first bushing extends above said depression surface at a height that is less than said depth of said one or more depressions and said flange is disposed on said depression surface; said bolt assembly further comprising a second bushing at said back sheet layer, said first and second bushing both extending into said core layer.