Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 251980 found under Valve Transfer Automatic Pilot by Woodward Hrt Inc. The National Stock Number assigned to this part is 6615000563085, and the Federal Supply Class is 6615 Automatic Pilot Mechanisms And Airborne Gyro Components. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 251980.