Offshore union RMT today repeated its call for a full public inquiry into the tragedy.
RMT is demanding lasting changes to regulatory standards to make the industry safer in the wake of a series of tragedies in recent years.
General secretary Mick Cash said: “On this grim anniversary for the industry, the union pledges to step up the fight for North Sea helicopter safety, a public inquiry and lasting changes to regulatory standards that are the best way to restore offshore workers’ confidence.”