Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 657-0011-001 found under Spring Tension Indi by Bf Goodrich Aerospace. The National Stock Number assigned to this part is 6610001062424, and the Federal Supply Class is 6610 Flight Instruments. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 657-0011-001.