Accident Overview
A twin-engine aircraft operating a patient transport flight from Melbourne crashed shortly after takeoff. The aircraft climbed normally to about 100 feet above ground level, then ceased climbing. The pilot informed the tower that the left engine had failed and that he was feathering the propeller and would return for landing. Witnesses observed the aircraft deviating left toward a large array of power lines, with wires extending from 40 to 90 feet above the ground. The aircraft converged with the array, likely below the height of the upper wires. It then veered left and struck the ground in a steep nose-down attitude. A fire broke out on impact, destroying much of the wreckage.
Flight Maneuvers
The final maneuver was typical of a twin-engine aircraft with one engine producing significantly less power than the other, combined with airspeed below that required for directional control. The pilot had reported left engine failure, and the loss of control observed by witnesses was consistent with reduced power from that engine and low airspeed.
Investigation
The investigation was hampered by extensive fire damage. Technical examination found no evidence of defects or malfunctions in the engines, systems, or airframe that might have contributed to the accident. Although the pilot indicated he was feathering the left propeller, the propeller was determined not to be feathered at the time of impact. It could not be established whether the pilot elected not to feather or initiated feathering too late for completion before impact. The reason for the reported loss of engine performance could not be determined.
Probable Cause (Official Findings)
It is likely that while maneuvering to avoid power lines and return for landing, airspeed decayed below the minimum required for adequate control. At the point of loss of control, insufficient height remained for recovery. The reason continued flight was attempted instead of a controlled forced landing in open areas before the power lines could not be determined.