WHILE REMOVING A MBC CONVEYER FROM THE RFM DOLLEY IN THE E17 ABANDONED SECTION, THE SCOOP TRACTOR RAM JACK, WHICH WAS CHAINED TO THE MBC CONVEYER, PULLED OUT OF THE SCOOP BUCKET ALLOWING THE MBC CONVEYER TO FALL AND STRIKE THE INJURED EMPLOYEE, PINNING HIM AGAINST THE TIGHT SIDE RIB.