WHILE DISMOUNTING FROM THE FRONT AREA OF A LOADER AFTER MAKING A REPAIR, THE INJURED SLIPPED ON THE BOTTOM RUNG OF THE LADDER AND FELL BACKWARD LESS THAN TWO FEET AND HIT HIS TAIL BONE ON THE Z-BAR OF THE LOADER BUCKET. HE FRACTURED HIS TAIL BONE. INCLIMENT WEATHER CONTRIBUTED TO SLIPPERY CONDITIONS.