Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 17121R3 found under Starter Engine Elec by Lucas Aerospace Power Equipment. The National Stock Number assigned to this part is 2925001419746, and the Federal Supply Class is 2925 Engine Electrical System Components Aircraft Prime Moving. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 17121R3.