Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number SP28-2231 found under Converter Frequency Static by Atc Power Systems Inc. The National Stock Number assigned to this part is 6130012487662, and the Federal Supply Class is 6130 Converters Electrical Non Rotating. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like SP28-2231.