The Air Accident Investigation unit has released its report on a fatal helicopter crash in Co. Kildare last year.
Just after 4pm on April 1, the Schwiezer aircraft left Weston Airport in Dublin on a training flight with an instructor and student on board.
It was last heard from as it left the Dublin control zone at 4.12pm.
The alarm was raised the next day and the helicopter wreckage was found by the Coastguard helicopter at Kilshancoe in Co. Kildare.
The investigation found the helicopter hit disused electrical power lines and the accident was "not survivable".
34-year-old Colm Clancy from Derrybeg in Co. Donegal, and his student Dermot Sheridan, aged 24, from Co. Clare, both died in the crash.