Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 3311278-61 found under Duct Assembly Bleed by Senior Operations Llc. The National Stock Number assigned to this part is 1560013969944, 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 3311278-61.