Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number BL-3880 found under Shaft Level Wind by Bell Boeing Joint Project Office. The National Stock Number assigned to this part is 3040000134372, and the Federal Supply Class is 3040 Miscellaneous Power Transmission Equipment. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like BL-3880.