Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number U540010 found under Duct Assembly Air C by Triumph Thermal Systems Inc. The National Stock Number assigned to this part is 1660013749892, 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 U540010.