AAIB report published into the R44 crash at Swansea here
AAIB summise the cause was a loss of tail rotor effectiveness:
The helicopter was hover taxiing in a light quartering tailwind. Such conditions make a loss of tail rotor effectiveness more likely. Having initiated a right turn, the pilot did not maintain positive control of the aircraft, and an uncommanded yaw developed which could not be brought under control before the helicopter hit the ground.
In the UK there has been little emphasis on the phenomenon, but most of the factors that can lead to LTE should be known by most UK helicopter pilots. However, the relationship of the various factors to the performance capability of Part 27 helicopters is probably less widely known. The pilot involved in this accident had been trained to cope with tail rotor failures, but he had not received training nor was he aware of the LTE phenomenon.
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