Steel shell
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 5945-01-418-1762
NSN 5960-01-230-2806
NSN 4140-00-088-3644
NSN 6320-01-544-6447
NSN 5910-01-297-3447
NSN 6320-01-192-0332
NSN 6145-01-466-1420
NSN 6150-00-925-2465
NSN 5920-01-534-8126
NSN 5935-00-216-7435
NSN 5935-00-068-0904
NSN 6110-00-518-2998