Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 17B0E3003-503 found under Switch Thermostatic by Boeing Company The. The National Stock Number assigned to this part is 5930014164220, and the Federal Supply Class is 5930 Switches. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 17B0E3003-503.