Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number B559-178 found under Lens Eye Crown by L3 Communications Corp. The National Stock Number assigned to this part is 6210007979613, 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 B559-178.