21.000 in.Lg, 2.000 in.Id;
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 6620-00-761-2540
NSN 5965-00-577-1242
NSN 5965-00-874-7795
NSN 5965-00-170-5254
NSN 6105-01-461-7953
NSN 6610-00-253-7676
NSN 5975-01-230-5985
NSN 6220-00-236-0588
NSN 5925-00-009-9818
NSN 6650-01-614-7328
NSN 6320-01-352-5653
NSN 6145-01-099-9620