A CAA spokesperson said:

“We have received the AAIB's final report into the tragic accident at Sumburgh in 2013 and will be considering it carefully.

“Since the accident, we have introduced a series of measures to increase the safety of offshore helicopter flights, following a ground-breaking review of the area that we published in 2014.

“As a result, helicopters are now prohibited from flying over the most severe sea conditions, so that the chance of a ditched helicopter capsizing is reduced and a rescue can be safely undertaken. In addition, every passenger is now equipped with new improved emergency breathing equipment to improve the chances of successful underwater escape and is seated next to an appropriately sized window exit. There have also been important changes to pilot training, particularly in the use of complex automated systems on helicopters.

“The safety of those who rely on offshore helicopter flights is one of our top priorities and we will continue to work with the helicopter operators, the offshore industries, international regulators, unions and pilot representatives to enhance offshore safety standards still further.”