Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number ET-00031-003 found under Transformer Current by Raytheon E Systems Inc. The National Stock Number assigned to this part is 5950014811069, and the Federal Supply Class is 5950 Coils And Transformers. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like ET-00031-003.