Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number DW3030139 ITEM 4 found under Pinion And Gear Ass by David Brown Gear Systems Limited. The National Stock Number assigned to this part is 3020011789410, 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 DW3030139 ITEM 4.