Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number FL53LB3KA1 found under Filter Radio Frequency Interference by Federal Aviation Administration. The National Stock Number assigned to this part is 5915002111870, 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 FL53LB3KA1.