Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number BY-1003S found under Filter Band Pass by Aeroflex Kdi Inc. The National Stock Number assigned to this part is 5915001633915, and the Federal Supply Class is 5915 Filters And Networks. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like BY-1003S.