HE WAS DISMOUNTING FROM THE CAT D10L DOZER WHEN HE LOST HIS FOOTING WHILE STEPPING ON THE PUSH ARM. WHEN HE STARTED TO FALL, HE GRABBED AND CAUGHT HIMSELF BY HOLDING ONTO THE HAND RAILING. THE WEIGHT OF HIS BODY BEING SUPPORTED BY HIS LEFT ARM CAUSED HIS LEFT BICEP TO TEAR REQURING SURGERY.