Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 23169-503 found under Plate Backing Brake by Socata Aircraft. The National Stock Number assigned to this part is 1630008685770, and the Federal Supply Class is 1630 Aircraft Wheel And Brake Systems. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 23169-503.