Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number B43D0001 found under Delay Line Assy by Mcdonnell Douglas. The National Stock Number assigned to this part is 1680002011907, and the Federal Supply Class is 1680 Miscellaneous Aircraft Accessories And Components. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like B43D0001.