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 6135-00-816-9052
NSN 6320-01-145-9013
NSN 6240-01-386-1354
NSN 5999-01-553-0857
NSN 7035-01-495-2253
NSN 4140-00-307-2732
NSN 5855-01-630-5790
NSN 5945-01-373-7584
NSN 5945-01-415-2842
NSN 7035-00-111-4389
NSN 6650-00-992-1873
NSN 5975-01-188-7460