A helicopter crash that killed two people at Cessnock was the result of a bolt detaching from the flight control system and human error, an investigation has found.
The Australian Transport Safety Bureau released yesterday its report into the incident on February 4 last year that killed experienced pilot Ivor Durham, 52, and Mudgee man Sam Bateman, 21.
Tony Davidson, of Kotara, escaped with burns after the helicopter crashed into the runway at Cessnock Aerodrome, rolled and became engulfed in flames.
Mr Durham and Mr Bateman died in the fire.
Mr Davidson had been flying the aircraft that morning for a training review and landed it on grass near the runway as part of a simulation of a hydraulic system failure.
The report said when the hydraulic system failed to re-engage, Mr Durham, who was the flying instructor, took the controls and tried to move the helicopter to the apron where it could be examined.
Mr Bateman, a passenger on the flight but the helicopter’s usual pilot, told Mr Durham the system had been leaking and he had added more hydraulic fluid that morning.
When they took off, Mr Durham experienced “immediate and increasing difficulty controlling the aircraft” before it crashed, the report said.
The bureau found a bolt that secured a part of the flight controls came off when the helicopter landed on the grass.
The pilot and instructor probably “misdiagnosed” the behaviour of the flight controls as being associated with failure of the hydraulic system.
The decision to move the helicopter was contrary to the advice of the helicopter’s operating handbook, it said.
While maintenance had been carried out on the helicopter, the crash reinforced the importance of thorough inspections by maintenance personnel and pilots.
The helicopter was among those due to have its aluminium fuel tanks replaced with bladder-type tanks that were less easy to rupture. The bureau said it was satisfied the manufacturer had issued advice that a retrofit deadline be brought forward from December 2014 to December 2013.
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