Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 65652-03271-042 found under Valve Assembly By Pass by Sikorsky Aircraft Corporation. The National Stock Number assigned to this part is 6615001639576, 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 65652-03271-042.