Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 340-3550407 found under Pivot Assembly Forward Service Door by Tracor Flight Systems Inc. The National Stock Number assigned to this part is 1560006218760, 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 340-3550407.