Twenty-three seconds of silence may have contributed to a mid-air helicopter collision that killed four people and injured nine others near Sea World on the Gold Coast.
The Australian Transport Safety Bureau has found no recordings of radio calls between pilots Ashley Jenkinson and Michael James in the moments before their choppers collided about 40m off the ground and crashed on January 2.
Mr James had been coming in to land with six passengers and Mr Jenkinson was taking off with seven people on board.
