Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 84-27031-002 found under Amplifier Audio Frequency by Raytheon E Systems Inc. The National Stock Number assigned to this part is 5996012548130, 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 84-27031-002.