2.540 in.Lg, 2.500 in.Id, 0.380 in.Thk;
An item composed of one or more materials, molded, compressed, and/or baked into a rigid covering of irregular shapes and sizes. it is designed to cover air ducts and/or air duct fittings used in air conditioning, heating, cooling, pressurizing and de-icing systems to restrict the dissipation of heat. it may completely or partially encase the item for which designed. it may be furnished with or without fillers, cement, and/or separate or attached accessories for installation, (excluding flexible air duct covering and rigid pipe and pipe fitting coverings used in construction and building materials). Excludes insulation blanket, thermal, aircraft; insulation pipe fitting covering, thermal; and insulation sleeving, thermal.
Classification: Other parts of airplanes or helicopters for use in military aircraft (excludes propellers, rotors, undercarriages, and parts thereof)
NSN 6650-01-517-1588
NSN 5975-01-588-0675
NSN 5855-01-479-1277
NSN 5985-00-228-0244
NSN 6685-01-133-5608
NSN 5996-01-592-5083
NSN 4140-01-369-9921
NSN 5960-01-426-4242
NSN 5895-01-116-2065
NSN 6650-00-169-1866
NSN 5950-00-397-9869
NSN 6620-01-268-9693