Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 21-242 found under Shim Magneto by Lucas Aerospace Power Equipment. The National Stock Number assigned to this part is 2925003368361, 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 21-242.