Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number E15-52B31-1 found under Thermostat Subassembly by Cae Usa Inc. The National Stock Number assigned to this part is 6940006315507, and the Federal Supply Class is . Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like E15-52B31-1.