Abstract: Employee #1 and two coworkers, of the Keysor-Century Corporation, Saugus, CA, were on a boom manlift, placing a new couple of elbows for the loading system for silo #52. All three were properly tied off with a belt and lanyard. They could not access one section from inside the manlift, so Employee #1 got out and unhooked his belt since it would not reach with him outside. He stepped onto several pipes that were already in place as part of the pipe rack. As he was working he slipped and either caused a pipe to break or a pipe broke underneath him. Employee #1 fell approximately 20 ft onto the concrete floor; he suffered a broken right arm, a broken collarbone, and lacerations.