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Occupational Safety and Health Administration OSHA

Accident Report Detail

Accident: 116456.015 - Employee Is Crushed And Killed By Amusement Ride

Accident: 116456.015 -- Report ID: 0352450 -- Event Date: 05/17/2019
InspectionOpen DateSICEstablishment Name
1402039.01505/17/2019Oceaneering International, Inc.
At 5:15 a.m. on May 17, 2019, a coworker, a Lead Technician and Employee #1, a M echanical Technician, were performing maintenance on an amusement park ride. The 12,500 pound vehicle consists of the chassis assembly, which rides on a track, and a twelve passenger cabin assembly, which weighs 4,500 pounds. These two com ponents are connected by a motion system assembly that is comprised of various m echanisms including, six electro-mechanical DOF actuators, and a yaw ring. The yaw ring provides rotation to the cabin and the DOF actuators control the vertic al height of the cabin as well as other motions such as tilting and rolling. Un der normal operation, the vehicle is controlled by a computer system and is prog rammed to complete a cycle of specific motions. While maintenance is being perf ormed, the main power provided by the track is locked out and tagged out of serv ice at the 240-volt panel and only certain functions are still accessible, and c ontrolled only by a 24-volt battery backup. The coworker locked out and tagged out the electrical panel. Employee #1 climbed under the raised cabin assembly to access the grease fitting and connect the grease gun on the underside of the ya w ring. The coworker was adjacent to the vehicle while operating the controls v ia battery backup. He engaged two switches required to release the yaw brake, in cluding a motion system override switch and a yaw brake release switch, allowing the cabin assembly to rotate freely to grease the yaw ring. When the coworker d isengaged the brakes for the yaw, the brakes for the DOF actuators also unexpect edly released. The 4,500 pounds cabin assembly immediately lowered onto Employe e #1, while he was laying on his side. Employee #1 was caught between the cabin assembly and the chassis assembly and was unresponsive. The coworker was limit ed on how quickly he could attempt to raise the cabin assembly off of Employee # 1 because he had to unlock the track power at the electrical panel and boot up t he computer system that fully controls the vehicle. While waiting for the compu ter to boot for several minutes, the coworker attempted to use a floor jack to l ift the cabin assembly off of Employee #1, but to no avail. The computer system indicated a fault so Employee #1 had to control and raise each DOF actuator ind ividually until there was enough space to release Employee #1, but he was still unresponsive. Employee #1 was killed from compressional asphyxia and chest inju ries.
Keywords: amusement ride, asphyxiated, caught between, chest, crushed, lockout/tagout, maintenance, unconsciousness
Employee # Inspection Age Sex Degree Nature Occupation
1 1402039.015 36 M Fatality Mechanical engineering technicians

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