The ambulance crew positioned the tracks in preparation for the descent on the top step of the staircase.The customer reported that once the chair started moving, the tracks did not work as they were supposed to, which resulted in a rapid acceleration of the chair and patient down a few steps.The ambulance crew member who was holding onto the top chair handle took the full weight of the chair and patient but managed to stop the descent.The patient was not injured during this event.The operator who took the weight of the chair and patient reported that he developed lower right lumbar discomfort and right shoulder discomfort in the days following the event and self-medicated with anti-inflammatories.The customer reported this event as a minor injury event.
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