Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number AL10C28HC ITEM 77 found under Gear Cluster by Duffnorton Co Inc. The National Stock Number assigned to this part is 3020012641949, and the Federal Supply Class is 3020 Gear Pulley Sprocket And Transmission Chain. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like AL10C28HC ITEM 77.