Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 57-00-523 found under Amplifier Assembly by Parker Hannifin Ltd. The National Stock Number assigned to this part is 5963004506972, and the Federal Supply Class is 5963 Electronic Modules. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 57-00-523.