Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number L5338640-021 found under Duct Assembly Air Conditioning H by Hi Shear Corporation. The National Stock Number assigned to this part is 1660012415775, and the Federal Supply Class is 1660 Aircraft Air Conditioning Heating And Pressurizing Equipment. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like L5338640-021.