Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number XW21121 227 90 found under Converter Assy Slow by Emerson Electric Co. The National Stock Number assigned to this part is 1680012321705, and the Federal Supply Class is 1680 Miscellaneous Aircraft Accessories And Components. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like XW21121 227 90.