What happened
On the night of the accident, a Robinson R22 helicopter, registration VH-LYD, was performing transit duties following fire spotting and ground crew direction. Tracking data and witness accounts confirm the aircraft was operating well after the end of civil twilight and nautical twilight. At approximately 1/19:29, the aircraft's movement ceased. The environment at the time was characterized by extreme darkness due to the absence of moonlight, a lack of ground lighting, and cloud cover obscuring stars. During this flight, the aircraft struck a tree at high speed while traveling on a path perpendicular to its intended destination of Rutland Plains.
The investigation
The ATSB examined the wreckage of VH-LYD and determined that mechanical failure was highly unlikely to have contributed to the accident. The investigation focused on the pilot's qualifications and the aircraft's capabilities. It was found that the pilot lacked a night rating and had not demonstrated competence for night operations through a formal flight review. Furthermore, the helicopter was not equipped with necessary instruments for night flight, such as an artificial horizon. The investigation also looked into the organizational culture of MDH Pty Ltd, finding that while there was no overt pressure to fly, a culture of high pilot autonomy and a desire to complete tasks for mustering teams led to the acceptance of flying after last light.
Findings
- The pilot operated the aircraft at night without the required night rating or demonstrated competency.
- The Robinson R22 was not equipped with the necessary instrumentation, such as an artificial horizon, for night operations.
- The pilot likely experienced spatial disorientation due to the lack of visual references in near-total darkness, leading to the collision with terrain.
- MDH Pty Ltd did not provide formal risk assessment tools or training, and the practice of flying after last light was a tolerated, unmanaged risk within the company.
- There was no evidence that a formal risk assessment was conducted for this specific flight, which would have necessitated cancelling the mission due to the lack of qualified personnel and equipment.