Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 10001645-503 found under Test Set Aircraft Egress System by Teledyne Risi Inc. The National Stock Number assigned to this part is 4920014843243, and the Federal Supply Class is . Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 10001645-503.