Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 89 90 253-57 found under Brush Electrical Co by Rolls Royce Power Engineering Plc. The National Stock Number assigned to this part is 5977014817516, and the Federal Supply Class is 5977 Electrical Contact Brushes And Electrodes. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 89 90 253-57.