Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number K43139P3S5F2 found under Gearcase Motor by Ai Tek Instruments Llc. The National Stock Number assigned to this part is 3010000687204, and the Federal Supply Class is 3010 Torque Converters And Speed Changers. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like K43139P3S5F2.