Thermal-acoustic enclosure

A gas turbine engine assembly comprising:

• an enclosure including a first wall, a second wall, a third wall, and a fourth wall, each said wall comprising:
• an inner panel comprising, in sequence outwardly from the enclosure hollow interior, an inner sheet comprising a plurality of perforations extending therethrough, a plurality of panel stiffening members coupled to said inner sheet, and at least one inner panel sound absorption member comprising non-metallic sound absorption material positioned between said plurality of panel stiffening members;
• and
• an outer panel comprising in sequence inwardly from outside of said enclosure, an outer panel sandwich member comprising non-metallic composite material including spaced-apart first and second walls and a plurality of spaced-apart transverse walls extending between said first and second walls defining hollow chambers therebetween, said outer panel is secured against said inner panel such that an outer surface of said at least one inner panel sound absorption member is substantially flush against an outer surface of said outer panel;
• and
• a gas turbine engine positioned within said enclosure.