The 58 year old was working on the ride this afternoon when he slipped and fell approximately three metres.
The steel arm of the ride then fell on top of him.
The Brisbane man suffered a fractured pelvis, fractured right leg and possible spinal injuries.
The patient was taken to Warwick Hospital just before 6pm where he was met by the Toowoomba-based RACQ CareFlight Rescue crew.
He was then airlifted to Brisbane’s Princess Alexandra Hospital in a stable condition.