Abstract: The invention relates to an acoustic sheild having a thermo-compressed shell based on fibres bound together by a thermoplastic binder to form a porous shell that has noise absorption properties. The shell has an internal face and an external face, and a sheet of metal for thermal protection against the engine. The sheet covers all or part of the internal face, the sheet is attached in a substantially fluidtight manner, essentially via its periphery to the shell. This creates a peripheral seal and maintains, except at the periphery, an air gap between the sheet and the shell, to protect the shell from the heat accumulated by the sheet.