According to the Air Accident Investigation Unit (AAIU), Rescue 116's Black Box has shown there were no mechanical issues with the helicopter.

They said that the investigation is still at a preliminary stage but that "No mechanical anomalies have been identified" during the initial analysis.

The AAIU says they've issued the report as this type of aircraft is in operation around the world and many people would be anxious to know if any immediate safety actions were required.

It says the examination of the device is ongoing and a preliminary report will be issued in the near future.

In a statement the AAIU said "The AAIU continues to work with other agencies to locate and recover the two missing crew members.

"The AAIU is mindful that Sikorsky S-92A helicopters are in operation around the world in a variety of roles, including Search and Rescue."

Meanwhile rough sea conditions have been hampering efforts to move the helicopter today.

Gerard O'Flynn from the Coastguard says they hope moving the wreckage will give some indication of the whereabouts of the two missing crewmembers.