Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 11989000 found under Heat Exchanger Air To Air Aircra by Ametek Thermal Systems Inc. The National Stock Number assigned to this part is 1660014343884, 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 11989000.