Four people died and nine people were injured when two helicopters collided mid-air on the Gold Coast Broadwater in January 2023, during the peak of the busy summer holiday season.
The Australian Transport Safety Bureau (ATSB) will hand down its final report into the crash on Wednesday, more than two years after the collision.
An interim report released in January 2024 revealed that a toxicology report for pilot Ashley Jenkinson, who died in the crash, had traces of cocaine in his system.
The examining forensic pathologist reported no signs of chronic stimulant use and the cocaine was unlikely to have been consumed within 24 hours of the crash and could have been taken up to four days prior.
The ATSB noted it was unlikely the drug level would have impaired the pilot's skills.
Earlier, a preliminary report released in March 2023 found the other pilot, Michael James, saw six passengers boarding the second helicopter as he was coming in to land with five people on board at another helipad.
Mr James thought the second helicopter would pass behind his aircraft and didn't remember the other pilot radioing him to say he was taking off.
A third helicopter pilot in the area recalled Mr James' inbound call but did not remember hearing a taxi call from the other pilot.
A fourth pilot also couldn't remember hearing calls from either of the helicopters before the crash.
ATSB Commissioner Angus Mitchell noted in the report that the evidence didn't necessarily mean that a taxiing call was not made, with the radio calls forming a central part of the final probe.
The final report due on Wednesday will include analysis of evidence, findings and any recommended safety actions.
Mr Jenkinson, 40, British couple Ron and Diane Hughes, 65 and 57, and Sydney mother Vanessa Tadros, 36, died in the crash.
Ms Tadros' son Nicholas, 10, underwent serious surgeries following the crash while Victorian mum Winnie de Silva, 33, and her nine-year-old son Leon were hospitalised.
The pilot of the second chopper, Mr James, managed to land his aircraft safely, but he and two of his passengers were injured by flying glass when its windshield shattered.
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