Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number B61C0004 found under Light Indicator by Mcdonnell Douglas. The National Stock Number assigned to this part is 6210009750622, 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 B61C0004.