Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number Y63-315330-154-5 found under Transmission by Gyrodyne Co Of America Inc. The National Stock Number assigned to this part is 1615007944635, and the Federal Supply Class is 1615 Helicopter Rotor Blades Drive Mechanisms And Components. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like Y63-315330-154-5.