Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 66C39843 1 found under Guard Dorsal by San Antonio Air Logistics Center. The National Stock Number assigned to this part is 1560007021417, 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 66C39843 1.