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The Boeing CH-47 Chinook is a versatile, twin-engine, tandem rotor heavy-lift helicopter.  This one was operated by CHC Helikopter Service. ..CHC Helikopter Service, previously just Helikopter Service is the Norwegian division of Canadian Helicopter Corporation. The airline was an independent company until 1999. It operates primarily to oil platforms on the Norwegian continental shelf in the North Sea, with crew change, infield shuttle and search and rescue operations. Though the global headquarters lay in Vancouver, Canada, the company has its main base at Stavanger Airport, Sola. © Fredrik Naumann