Accident Overview
On 14 November 2022, a Robinson Helicopter R22 Beta, registered VH-LOS, was operating near the Arafura Swamp in the Northern Territory as part of an animal mustering operation. After the day's operations concluded, the helicopter returned to the mustering camp based on recorded data. When ground crew arrived at the camp, the pilot and helicopter were absent. Concern grew, and a search using land vehicles commenced. The following morning, an aerial search was organised, and at about 1300 on 15 November, the wreckage was located approximately 6 km from the camp. The pilot was deceased, and the helicopter was destroyed.
Investigation Findings
The Australian Transport Safety Bureau (ATSB) determined that the pilot operated the helicopter after the end of nautical twilight in cloudy conditions, away from the direction of sunset. With no celestial or terrestrial lighting, the flight occurred in dark night conditions. The pilot did not hold an appropriate qualification, and the helicopter was not equipped for night flight. While flying in these conditions, the pilot likely became spatially disoriented, resulting in a collision with terrain.
A pathologist's report indicated that the injuries sustained in the collision were probably not fatal, and the pilot likely succumbed to environmental exposure. The helicopter was equipped with a manually activated personal locator beacon (PLB), but it was secured inside the aircraft and probably inaccessible after the pilot exited the wreckage.
When the mustering group realised the pilot was missing, they considered that the pilot may have landed and would return the next day or be waiting nearby. Consequently, they did not contact emergency services. This delay, combined with the absence of a distress signal from the PLB, led to a delayed search and rescue response.
Flight After Last Light
The collision occurred sometime after 1925 on 14 November. There was no indication of mechanical problems; the helicopter had sufficient fuel, and no evidence of bird strike or other object collision. A post-mortem examination revealed no medical factors that would have caused sudden incapacitation.
Aircraft tracking records showed the accident flight occurred after nautical twilight. The pilot lacked a night VFR rating, and the helicopter was not equipped for instrument flight. The accident site was extremely remote with no terrestrial lighting. The moon rose late, providing no illumination. Cloudy conditions from a westerly storm system may have further reduced visibility. The last recorded position and accident location suggest the flight was eastward, with sunset behind the aircraft.
The ATSB concluded the flight was conducted in dark night conditions due to the absence of celestial and terrestrial lighting. In such environments, spatial disorientation is highly likely without access to aircraft instrumentation. The helicopter's nose-down, left-side down attitude and short wreckage trail were consistent with slow speed and an unusual attitude before impact.
Delayed Rescue
The combination of the PLB not being activated and authorities not being notified led to a delay in locating the pilot before succumbing to environmental exposure after sustaining survivable injuries.