 Families of those who lost their lives in the disaster have been highly critical of the Coroner's findings and the deficiencies in the operations of the regulator, the Civil Aviation Safety Authority (CASA), and the poor company structure and practices of Transair Ltd.The investigation was aided by flight information from the aircraft's flight data recorder.As the cockpit voice recorder was unserviceable, and had been for some time, the conversations occurring between the flight crew will never be known.