Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 65664-03100-121 found under Block Aircraft by Fleet Readiness Center East Div Department Of Navy. The National Stock Number assigned to this part is 1560016121271, and the Federal Supply Class is 1560 Airframe Structural Components. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 65664-03100-121.