Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 74A837231-1003 found under Duct Assembly Air C by Monogram Aerospace Fasteners Inc. The National Stock Number assigned to this part is 1660013800190, 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 74A837231-1003.