Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 657931 found under Housing Oil Sump Aircraft Gas Tu by American Aircraft Parts Mfg Co. The National Stock Number assigned to this part is 2840004073152, and the Federal Supply Class is 2840 Gas Turbines And Jet Engines Aircraft Prime Moving And Components. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 657931.