Patent ID: 7770692

Claim:
An acoustic treatment for an engine having at least one engine component extending substantially therefrom, the acoustic treatment comprising: a base layer having a frame shaped configuration defining a substantially open central region with the at least one engine component disposed within the open central region, the base layer having a first base surface contoured to mate with an exterior surface of the engine for providing an acoustic seal between the engine and the base layer, and an opposing second base surface; a secondary layer defining a solid configuration covering the open central region of the base layer, the secondary layer having a secondary layer mating surface contoured to mate with the second base surface at a mating interface to provide an acoustic seal about the open central region between the base layer and the secondary layer, with the solid configuration closing the open central region to trap noise between the engine and the secondary layer, the secondary layer further including an opposing secondary layer outer surface; and a shell having a first shell surface contoured to mate with the secondary layer outer surface, the shell substantially covering the secondary layer and at least a portion of the base layer, with the shell and the secondary layer spaced from the engine to define an air gap over the open central region between the engine exterior surface and the first shell surface; wherein the mating interface provides a pass-through location to permit the at least one engine component to pass from the open central region, between the base layer and the secondary layer, wherein the mating interface is contoured to mate with the at least one engine component to provide an acoustic seal against the at least one engine component.