Abstract: At approximately 6:00 a.m. on December 6, 2006, Employee #1 was working as a supervisor at a United Parcel Service (UPS) facility in Ontario, CA. A coworker of his was operating an FMC Model Number B1200 "push back" tow tractor, with Serial Number B12DZ98025, and a gross vehicle weight (GVW) of 100,000 pounds. It was designed for pushing and towing aircraft. The push back operator was driving south toward Employee #1's location. Employee #1 was on the ground, facing a Tiger Model Number TIG- 40 tug, with Serial Number 497011, and a weight of 5500 pounds. It was facing northeast. As the coworker approached Employee #1's location, he turned off the ignition and applied the brakes. The push back, however, continued on its southward motion. The push back struck the back end of the tug, throwing it in a counterclockwise spin. The tug struck Employee #1, pushing him against the push back, which was still moving. The push back came to a stop several feet past the collision site. Employee #1 sustained an unspecified fracture, and he was transported to Arrowhead Regional Medical Center. He was hospitalized.