Hannes Arch, one of the select few pilots in the world to fly in the highly technical Red Bull Air Race series, died yesterday in a helicopter accident in the Austrian Alps. On Thursday evening Arch, who was an avid mountaineer, was flying a Robinson R66 helicopter from the Elberfelderstraße hut, a mountain hut located in the south central part of Austria, the Austrian Broadcasting Corporation (ORF) said. Shortly after takeoff, the helicopter hit a cliff and crashed into a steep gully. The conditions at the time of the accident were night VFR. The cause of the crash has not been determined.