Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number AVB57 found under Power Relay Panel by Sundstrand International Corporation. The National Stock Number assigned to this part is 1680008760686, 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 AVB57.