Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number PA20397 2120 REV 3 ITEM 21 found under Resistor Fixed Film by Alstom Power Conversion Usa Inc. The National Stock Number assigned to this part is 5905015493653, and the Federal Supply Class is 5905 Resistors. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like PA20397 2120 REV 3 ITEM 21.