This course covers the maintenance-, monitoring- and recording systems used in aircraft. The Cockpit Voice Recorder (CVR) is a key system that continuously records flight crew communications, cockpit conversations and passenger address audio while the aircraft electrical system is powered.  The Flight Data Recorder (FDR) system processes and records critical flight parameters for incident or accident investigation. The Aircraft Condition Monitoring System (ACMS) is a key element of predictive maintenance and consists of a Flight Data Acquisition Unit (FDAU) and associated sensors that provide sensor data from all major aircraft systems and components.