It has emerged that formal procedures were not followed by Air Traffic Control at Weston Airport when a training flight left the airport before crashing half an hour later.
Details of the training flight should have been logged but were not.
The airport and academy operating the flight is insisting it complied with all protocols as it should have.
When a flight departs Weston and enters uncontrolled airspace, its identity, number of people on board, amount of fuel, flight area and time of arrival should be logged and passed on to Dublin Air Traffic Control according to the Irish Aviation Authority.
It has emerged this was not done in the case of the training flight which left the Airport on Wednesday evening with two men on board.
RTÉ News has learned that the pilot had a 30 second conversation with air traffic control when he was between Kilcock and Enfield confirming his altitude and location.
But 15 minutes later the helicopter crashed into Kilmurray bog, both the instructor and trainee were killed.
Tonight the European Helicopter Academy and Weston Airport insisted all proper protocalls were followed.
Two separate investigations are under way.
