The DFDR system provides the functionality of a Flight Data Recorder (FDR), a Cockpit Voice recorder (CVR) and an Emergency Locator Transmitter (ELT) in one combined system. The DFDR System is comprised of a Crash hardened, Radio Transparent, aerodynamically shaped Deployable Beacon Aerofoil Unit (DBAU) and other LRUs Viz Energy Storage Unit (ESU), Cockpit Control Unit (CCU), Release unit with Mounting Tray and crash sensors. The DBAU detects the onset of crash via different sensors installed on aircraft and automatically deployed from aircraft.