Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 564-2664-004 found under by Sierra Nevada Corporation. The National Stock Number assigned to this part is 5841000725473, and the Federal Supply Class is 5841 Radar Equipment Airborne. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 564-2664-004.