For anyone who is stating that these rides are unsafe etc, take a moment to think about this... You are in MUCH more danger of being in an accident on the way to a carnival or show than you are on any of the rides. Whilst the exact cause is unknown, it's likely a FREAK accident. Yes it's unfortunate that this has happened, but i'd honestly trust my life and any of my friends lives on these attractions. Do you honestly think the owners of these rides spend over a million dollars importing these world class attractions and are going to risk their livelihood along with their families (and any other people riding these attractions) by not maintaining them. These rides are subject to some of the most in depth testing and inspections in the world before being signed off to operate at any of the shows in Australia. I have 100% faith in each of these rides, and the operators of them that if something WAS found to be wrong at these inspections that they would refuse to operate the ride until the proper fixes have been implemented. Yes they would lose money but it's not worth the risk to put it simply.
having worked in the amusement industry and carnival industry for many years myself I can promise you that the staff at theme parks and carnivals take height restrictions VERY seriously no matter what. However if it's a really busy period of time, sadly if people are in a big group a person can slip through the cracks. These attractions are as safe, if not safer than our attractions at the theme parks. When you think about it, these rides are dismantled almost on a weekly basis so components are checked more frequently than the theme park versions. The staff operating them know the ride inside and out and not just from an operational standpoint.
It is a tragic accident either way, and it's best not to speculate on what has caused the incident out of respect for the families and the staff / owners of the AirMaxx 360. My thoughts and prayers do go out to the family and friends of the young girl involved, and to the operators and the owner of this ride who I am sure are as hurt and devastated that this accident happened especially considering the ride is just over a year old.