Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 548-7731-005 found under Amplifier Subassemb by J F C Electronics Inc. The National Stock Number assigned to this part is 5996009049820, 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 548-7731-005.