Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 4000-0329 found under Amplifier Synchro S by Lilbern Design Of Virginia Llc. The National Stock Number assigned to this part is 5996012239741, and the Federal Supply Class is . Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 4000-0329.