Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number B4028539 found under Coil Radio Frequency by L 3 Communications Corporation. The National Stock Number assigned to this part is 5950012073570, and the Federal Supply Class is 5950 Coils And Transformers. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like B4028539.