What happened
On 24 February 2013, a Robinson R44 Raven II helicopter, operated by Volcanic Air Safaris Limited, experienced a loss of engine power shortly after departing for its second scenic flight of the day. The aircraft was carrying a pilot and three passengers at the time of the incident.
In response to the power loss, the pilot initiated an autorotation and maneuvered the helicopter toward the shoreline. The aircraft was successfully ditched in shallow water near the edge of a lake. All four occupants were able to evacuate the helicopter without injury and were subsequently rescued by a nearby jet boat.
The investigation
The investigation focused on the mechanical failure that led to the loss of power and the maintenance history of the engine. Investigators examined the engine's components and the documentation associated with the imported, second-hand engine used in the aircraft.
While the investigation noted that the engine's records and history had not been sufficiently scrutinized prior to being released for service, this lack of documentation was not identified as a direct contributor to the specific power loss event. Instead, the inquiry focused on the physical state of the engine components following the failure.
Findings
The investigation determined that the primary cause of the engine power loss was a malfunction of the engine's right magneto. This malfunction occurred because engine oil had accumulated within the magneto. This accumulation was the direct result of an oil slinger being omitted during a previous maintenance procedure.
Safety action
Following the inquiry, the Commission issued recommendations to improve safety standards for both maintenance and passenger protection:
- The Director of Civil Aviation was advised to provide specific guidance to Part 145 certified companies regarding the inspection of parts and components that have incomplete airworthiness documentation or unknown service histories.
- The Commission recommended promoting the use of quick-donning life jackets for all occupants of single-engine aircraft operating over water to mitigate risks during ditching events.