Metal components made from 17-4ph or 15-5ph stainless steel which is heat treated to 160, 000 psi; elastomer is made of rubber; consists of a molded core, apu brackets, cover plate, and outer housing which attaches to the aft fuselage structure through struts; designed to minimize noise transmission from the apu into the passenger cabin, limit shock loads from the airframe, and limit deflection of the apu; forward left isolator
