Investigators ruled out gearbox failure in helicopter crash which killed four passengers, including north-east oil worker

Wreckage of the Super Puma L2 helicopter which went down in the North Sea with the loss of four lives , around two miles west of Sumburgh airport on Shetland
Wreckage of the Super Puma L2 helicopter which went down in the North Sea with the loss of four lives , around two miles west of Sumburgh airport on Shetland