Irwin Mitchell has launched its own investigation into the accident in which a Super Puma helicopter came down en route to Sumburgh Airport on Shetland in August, with 16 passengers and two crew on board.
Four men died and will be remembered at a memorial service at Kirk of St Nicholas in Aberdeen today.
One survivor, James Nugent, suffered a spinal injury and concussion in the crash, which has destroyed his offshore career.
Mr Nugent, who lives in Newquay, is being represented by Irwin Mitchell for a potential compensation claim.
One of the firm's partners, Jim Morris, said: "The number of crashes involving helicopters on journeys from offshore sites in recent years is incredibly worrying and a clear indication that something needs to be done to review and improve safety standards.
"We have now heard first-hand from our client of the terrible details of this tragedy and he is desperate for answers over how this happened, as well as what will be done to prevent this from happening again. Lessons must be learned in relation to the crash."