When interviewed during the preliminary report, the pilot recalled the helicopter spinning at least five times before impacting the ground. After the impact, the chopper quickly filled up with smoke. The pilot then used his helmet to break out the window. When asked what he thought caused the helicopter to spin to the right so quickly, he replied, "I don't know."
In a report released today, the National Transportation Safety Board now says it likely that that the pilot did not adequately account for the helicopter's low airspeed when he applied power to go-around at a low airspeed in dark, night condition