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The 1975 Kjalarnes helicopter crash occurred on 17 January 1975, when a Sikorsky S-55B helicopter crashed by the Hjarðarnes farm in Hvalfjörður, Iceland, while en route from Reykjavík Airport to Snæfellsnes. Seven people were on board, including two crew members and five employees of RARIK, the Icelandic State Electricity company. Everyone on board was killed on impact. It remains the deadliest helicopter crash in Icelandic aviation history.