More than 23,000 people have so far signed a petition calling for the Civil Aviation Authority to permanently remove the Airbus EC225 Super Puma from service.
Training records for the co-pilot of the fatal Sumburgh crash suggested he had experienced some difficulties during a course with "managing the workload and becoming overloaded" at times.
Safety remains an "absolute priority" one year on from the publication of a report addressing issues on offshore helicopter flights. The Civil Aviation Authority (CAA)'s CAT-1145 report was released on February 20, 2014 and listed 61 actions and recommendations aimed at addressing accident prevention for workers travelling offshore by helicopter. It comes one month after the CAA said there is still work to be done to improve flight safety.
Safety checks have been ordered on Super Puma helicopters after it was warned cabin doors could jam shut in an emergency. The airworthiness directive, issued by the European Aviation Safety Agency (EASA), was given for the Airbus AS332 and EC225 aircraft. Operators will now have to carry out an inspection within three months for aircraft more than a year old and within the next 15 months for more recent models.