Data transmitted from FDAU to FDR uses ARINC 717 format, as well as the data feedback that is sent back from the FDR to the FDAU. Real time monitoring on the ARINC 717 bus allows a better look at all the data sent by FDAU to FDR. On-line analysis and troubleshooting FDAU and all the sensors is possible using the ARINC 717 bus monitoring.