A final report is expected later from the AAIB (Air Accidents Investigation Branch) into what caused a fatal helicopter crash in 2013.
Four people were killed when a Super Puma plunged into the sea on its approach to Sumburgh Airport.
The latest reports comes after an initial assessment found the crew failed to notice the helicopter’s air speed dropping until it was too late.
The new report is expected to make safety recommendation for both operators and pilots.
Passengers Sarah Darnley from Elgin, Gary McCrossan, from Inverness, Duncan Munro, from Bishop Auckland, and George Allison, from Winchester, lost their lives in the crash on 23 August 2013.
Fourteen people were also rescued.
The special bulletin published by the AAIB in October 2013 found there was no evidence of a techical fault.
Two years ago, the CAA (Civil Aviation Authority) said a series of measures would be taken aimed at improving offshore helicopter safety following an inquiry being set up in the wake of the Shetland crash.
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