Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 63-9951 found under Resistor Board by Federal Aviation Administration. The National Stock Number assigned to this part is 6210009293318, and the Federal Supply Class is 6210 Indoor And Outdoor Electrical Lighting Fixtures. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 63-9951.