The ATSB Interim Factual Investigation Report into the Metroliner fatal aircraft accident on 7 May 2005 near Lockhart River has found that if the ground proximity warning system functioned as designed, the crew should have received a number of warnings from the system as the aircraft descended below the minimum obstacle clearance altitude of 2,060 ft.
However, because no data on the cockpit voice recorder (CVR) was useable, the functionality of the warnings could not be confirmed. Flight data recorder information from the accident aircraft continues to assist with the ATSB investigation.…