This report contains a description of the accident by a witness who watched it happen.
Mrs Cox said her 32-year-old son Garry had been in the helicopter moments before it crashed.
"They'd done one little inspection (for locusts) and had gone about 50 metres and were going to put (the helicopter) down again and that's when it hit the powerlines," she said.
Two sets of powerlines intersected to form a T at the point where the helicopter crashed, Mrs Cox said.
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Very sad.