Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 5520-00013 found under Semiconductor Device Photo by Engine Monitor Inc. The National Stock Number assigned to this part is 5961012742050, and the Federal Supply Class is 5961 Semiconductor Devices And Associated Hardware. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 5520-00013.