Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number TR131AA1 found under Transmitter Rate Of Flow by Aeronautical And Support Equipment. The National Stock Number assigned to this part is 6620000058610, and the Federal Supply Class is 6620 Engine Instruments. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like TR131AA1.