Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 503494-409DDA found under Harness Set Aircraft Safety by Am Safe Inc. The National Stock Number assigned to this part is 1680014228130, 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 503494-409DDA.