Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number L8742231 found under Heat Exchanger Air To Air Aircra by Honeywell Aerospace. The National Stock Number assigned to this part is 1660011401976, 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 L8742231.