Narrative
The pilot reported that the helicopter was higher than intended over the platform and had set up a right downwind approach. During the approach, the pilot experienced difficulty maintaining ground track due to strong gusty winds. When nearly over the platform, the pilot made a large correction and began descending. The turn to final approach was greater than 180 degrees. As the aircraft was approaching at about 300 feet and 60 mph, and as the pilot was preparing to arm the floats, the helicopter began a sudden rate of descent. Application of full collective was ineffective in stopping the descent. The aircraft subsequently struck the water and capsized without the pop-out floats having been inflated.
Operational Context
Company flight operations personnel stated that the approach as flown by the pilot was not in accordance with their normal operating procedures.
Probable Cause
No probable cause was stated in the source.