A preliminary report by air accident investigators into a crash in Birr, Co Offaly says that the plane did not have a technical defect.
Flying instructor Niall Doherty from Roscrea and trainee pilot Damien Deegan from Crinkle died when the Cessna aircraft crashed.
The light plane took off from Birr Airfield last month.
Shannon air traffic controllers raised the alarm when the Cessna 150 aircraft disappeared from their screens.
Emergency services began a search in an area south of the town and found the plane in woodland.