Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 7138991 found under Yoke Extend Chain by Trak International. The National Stock Number assigned to this part is 4320015035569, 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 7138991.