Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 8542R111AX found under by L 3 Communications Essco Inc. The National Stock Number assigned to this part is 5840013636427, and the Federal Supply Class is 5840 Radar Equipment Except Airborne. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 8542R111AX.