Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 581663 found under Parts Kit Hydraulic Pump by Airline Hydraulics Corporation. The National Stock Number assigned to this part is 4320013180504, and the Federal Supply Class is 4320 Power And Hand Pumps. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 581663.