Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 542-0-48-017-101 found under Duct Assemblyair Conditioning H by Drs Environmental Systems Inc. The National Stock Number assigned to this part is 2540016959976, and the Federal Supply Class is 2540 Vehicular Furniture And Accessories. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 542-0-48-017-101.