The NTSB found the crash was caused when pilot Ara Zobayan became disoriented in heavy fog that left him unable to discern up from down, causing him to slam the copter in a hillside. According to NTSB chief investigator Bill English, Zobayan told an air traffic controller ``he was climbing (to) 4,000 feet, however, by that time, the helicopter was in a tightening left turn and descending rapidly.

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