Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 522 1056 004 found under Oscillator Crystal Controlled by Rockwell Collins Inc. The National Stock Number assigned to this part is 5963006155447, 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 522 1056 004.