Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 12990-101A found under Duct Assembly Air Conditioning H by Arrowhead Products Corporation. The National Stock Number assigned to this part is 1660004212075, 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 12990-101A.