Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 421-0-024 REV A ITEM NO 4 found under Controller Electric by Maritime Applied Physics Corporation. The National Stock Number assigned to this part is 6110016127361, and the Federal Supply Class is 6110 Electrical Control Equipment. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 421-0-024 REV A ITEM NO 4.