Dreamworld Ride Faults A Concern: Tradie

The number of faults on Dreamworld ride before a fatal tragedy in October 2016 should have been concerning and the ride shut down, an inquest has heard.

Electrician Michael Takac undertook annual maintenance on the Thunder River Rapids ride at the Gold Coast theme park as an external contractor.

He told an inquest on Monday the ride's recurring earth faults on the morning of October 25, 2016, warranted further investigation.

"It is concerning because you don't know what it's related to," Takac told Southport Coroners Court.

"It could be multiple things, an earth fault is pretty hard to find ... my advice would be to stop the machine. Investigate it further and identify the fault."

The Thunder River Rapids ride at Dreamworld, after the accident in 2016 (AAP Image/Dan Peled)

Cindy Low, Kate Goodchild, her brother Luke Dorsett and his partner Roozi Araghi all died when the 30-year-old ride malfunctioned, causing two rafts to collide and flip.

The malfunction was the third failure of the ride's water pump that day.

Takac was asked if he felt the process taken on the day by park engineering staff to simply reset and reboot the pump following advice from an on-site electrical engineer was something he would advise in the case of repeated earth faults on a device.

"No, definitely not," he said.

The inquest also heard Dreamworld had made a booking with Takac's employer Applied Electro to have the pumps inspected and Takac's supervisor had scheduled him to visit Dreamworld on October 27.

Earlier on Monday, the inquest was shown conclusions of a safety audit reporting the installation of a water level sensor during upgrade works months before would've prevented the tragedy.

The inquest has already heard reduced water levels due to the failed pump contributed significantly to the tragedy.

The audit by Safety Related Control Systems concluded the lack of a water level sensor on the ride was the "primary cause" of the incident.

External firm Products for Industry (PFI) completed a $19,000 safety upgrade for the ride in March 2016.

That upgrade did not include the installation of a water level sensor, although it was being considered for a proposed second stage of the upgrade.

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"Such a safety system could easily have been provided and at a minimal cost," the report concludes.

PFI electrical engineer Matthew Sullivan agreed when asked if it would have been possible to install a water sensor on the ride.

Despite multiple tests on the drive following the tragedy, the exact cause of the fault was unable to be determined, the inquest heard.

The inquest continues.