Abstract: At approximately 1:00 p.m on April 13, 1994, Employee #1 was holding and hammering off a large pin at waist level when he lost his balance and fell forward and landed on both heels. He sustained fractured heels and was taken to a nearby hospital by a coworker. Employee #1 was dismantling a large drill rig and was standing on a guarded platform but failed to wear a safety belt. When he moved to hammer the pin off on the unguarded side, he fell forward, still holding onto the large hammer and the pin. Employee #1 had experience and has performed the same job about four to five times. Employee #1 violated the company's rule by not wearing the provided safety belt while working aloft on the derrick, and was reprimanded. No malfunction in equipment and procedures was found. No accident-related violation was discovered during the investigation, and no citation was issued.