Incident Overview
During an approach to a helideck, the pilot of a helicopter experienced a partial loss of engine power. In response, the pilot executed a successful autorotation, landing the aircraft in a controlled manner despite the power reduction.
Post-Landing Conditions and Actions
Following the landing, the sea state was high, with wind from 300 degrees at 18 knots, gusting to 30 knots. To prevent the tail boom from striking the main rotor blade while awaiting rescue, the pilot elected to maintain the engine at idle power. However, wave action subsequently damaged the tail rotor blades, which then made contact with the tail boom.
Evacuation and Subsequent Findings
After the tail rotor blades contacted the tail boom, all occupants evacuated the helicopter and boarded a life raft. No further details about the occupants or any injuries were provided. An engine test run conducted later was successful. The specific cause of the partial power loss could not be determined.