Event type


  • Rider action failure: while walking, standing, loading, unloading, e.g., jump during ride cycle or evacuation, slip or trip. The action was a reasonable one during the exposure, but it was executed in a way that resulted in failure, such as falling, striking against a structure or another rider, landing in an unintended position or location. The failure of action may have been by a different person than the rider who was injured (e.g., small child on trampoline crushed under falling adult). Failure of action describes body action performance, and not start/stop/steer of vehicles.
  • Rider self-extraction: includes ntentional self-extraction and consequential fall or impact and unintentional ejection after standing or rising during the ride cycle.
  • Rider medical condition: Rider experienced a medical condition or reaction, potentially aggravated by ride experience. Includes pain of unspecified origin unless origin implied by the report. Includes motion sickness.
  • Patron encroachment: A non-rider has entered a restricted area/hazard zone during operating hours, whether the area/zone is marked or unmarked, possibly resulting in impact or fall.

Ride malfunction

  • Loss of integrity of ride structure or mechanical components including restraint devices, e.g., collapse, detachment, derailment, release of hydraulic fluid, chain broke, tipped over

Ride hazard exposure

  • Chemical – release of chemical that should not have been released or effects of usage of unintended concentration
  • Electricity – fatal or nonfatal electric shock – electric current was conducted where it does not belong.
  • Surface hazard – contact with surface produced laceration, burn, abrasion due to the characteristic of the surface (contact with the surface is normal but the condition of the surface was hazardous)
  • Foreign object – injury inflicted by foreign object on ride when rider came into contact with it. Includes contact with hazardous foreign objects left in ride by others, debris falling or blowing onto the ride other than loose parts that should have been attached to the ride separating from the same ride. (Parts falling off are classified as malfunction.)
  • Ride entanglement –  Rider’s hair, clothing, jewellery, or body part became entangled or pinched in machinery or loose part of machinery (such as rope) entangled rider’s body part.
  • Ride clearance failure – While the rider moved or was moved by the ride, while remaining within the provided restraint and containment system, part of the rider’s body impacted against stationary or moving object that is or should be outside clearance envelope or into a gap that failed to exclude the rider’s body part. Injury may have been produced by the impingement but the body part was not entangled or entrapped in the gap (entanglement).

Ride forces body motion unintended

  • Rider’s body was moved due to ride forces within the restraint and containment system, with or without impact, for example flailing during abrupt changes of direction or sudden acceleration or deceleration.

Ride ejection

  • Ejection described and report does not cite any self-extraction, malfunction, or misoperation. The rider has unintentionally separated from the ride or ride vehicle due to ride forces and inadequate containment of body size or shape. The ride acceleration caused the mass of the rider to exit through a gap wide enough for the rider’s shape to fit through, or rider slipped through a gap and fell due to gravity. The rider did not rise up, lean out, or make any attempt to exit the ride, but rider may have been in an alternate position not anticipated by the ride designer. All structures and components were intact, properly operated, functioning as designed. Ejected rider may have landed on the ground or another exterior structure, or may have struck against outer structures within the vehicle or ride surroundings not intended for rider contact.

Operation misoperation

  • Operator started or stopped the ride too early, too late, too quickly, too slowly, in the wrong direction, at the wrong place, incompletely. e.g., operator did not fasten restraint devices or verify fastening by patron.

Note that operator misoperation may have resulted from control interface design or other barriers to effective performance. This event type is not faulting the operator, just describing that the operator action was incorrect. This event type does not apply to patron use of ride, even in patron directed rides. See rider event types.

Operation separation failure

  • Independently moving riders or vehicles collided with other riders or vehicles. Includes rides subject to gravity and momentum of free-moving bodies or vehicles, and vehicles steered or braked by the rider such as bumper cars, go karts, mountain coasters.

Operation submersion

  • Rider was submerged in water and drowned or rescued from drowning

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