A memorial service was held in County Mayo for the second year of the disaster rescue operation.
Four of the crews lost their lives when the Sikorsky S-92 aircraft was landed on Black Rock Island, at the beginning of 14 March 2017.
Captain Dara Fitzpatrick's Captain and Captain Mark Duffy were returned in the days after the disaster.
The remains of her colleagues, Paul Ormsby, who join the club, and the former owner of the winch house, Ciarán Smith, are still lost at sea.
Relatives of deceased members gathered to celebrate mass at St Brendan's Church near Eachlroma tonight.
Two years later, studies have continued and efforts are being made to make a number of recommendations after the accident.
The Department of Transport says work is continuing to implement recommendations from a review of air search and rescue operations regulation.
Today marks the 2nd anniversary of the defeat of Captain Dara Fitzpatrick, Captain Mark Duffy, Winchman Paul Ormsby & Winchman Ciaran Smith when a rescue rescue salvaged protection from the coast of Mayo long; during his expedition to the Atlantic.
– Irish Coast Guard (@IrishCoastGuard) tResults – Irish Coast Guard (@IrishCoastGuard) t March 14, 2019
The review was published last September, following an audit of the disaster, said the audit would require scrutiny.
She made 12 recommendations in total and gave some time to implement them.
However, almost six months later, only one of the recommendations was implemented in full.
Work is continuing to develop two other 'short-term' actions.
A sector spokesperson said that the Irish Aviation Authority had reviewed the CHC's safety management system – the company which is contracted to use helicopter services by the home guard. This said that the process was appropriate.
The IAA continues to work to develop its guidance space for air-based SAR activity. He has also been involved in Guard Coast talks to ensure consistency of how rules are applied.
The department reports that the National Rescue and Rescue Framework was revised to include a number of other recommendations in last year's report.
The former Chief Executive of the UK Marine and Coastguard Agency is chairing a review group to progress those mid-term proposals.
As well as looking at the issues raised in relation to air operations, the process also looks at advice from a separate inquiry into the death of a volunteer worker in a guard. T environment, Caitriona Lucas in Kilkee, Co Clare in 2016.
It is expected that the group will complete its discussions during the summer months.
The department reports that this work is being carried out with a view to reviewing the guidance for research and rescue operations, to ensure that all proposals are implemented in full.
At the same time, CHC has informed RTÉ News that it has been involved in a number of recommendations delivered by the Air Accident Search Unit of the Transport Department.
The company's safety management system was reviewed externally and revised route guidance was sent to the Irish Aviation Authority.
In addition, the crews updated all the lifejackets given to Shore Coast staff and returned to CnG. This was followed by concerns about the safety of safety checks on the jackets.
Earlier this month, Air Accident Investigation Unit said the work on their final report had been staged.
The AAIU said it focused on achieving the full report, rather than publishing a further interim report on its inquiry to mark today.
While regular updates are given to ongoing investigations once a year, the AAIU said that this would remove the report's completion work for the reasons of the accident.
Every aspect of the deadly journey is examined, including the first night crew attempt.
It is thought that a precise examination of the helicopter's decision to "top-dress" another crew on the night of 13 March 2017 will be considered.
A second, ward-led inspection is also underway. It was described as a “complex process”.
Researchers have been interviewing, reviewing evidence and logging out all parts of helicopter debris that were recovered from the water in the months after the accident.
The work is linked to the Health and Safety Authority in the accident.
When that research is complete, a file will be sent to the Director of Public Evidence. Ultimately this will decide whether to take a criminal offense against the accident.
The tests listed in the death of four members of the team will not go ahead until the conclusion of the two inquiries.