THE AIR HOSE TO THE CHIPPING FUN WAS PUNCTURED CAUSING A LOT OF COAL DUST TO BLOW AROUND. DUE TO THE POOR VISIBILITY EE WAS TRYING TO THROW THE AIR HOSE AND THE CHIPPING GUN OUT OF THE CHUTE A ND LOST HIS BALANCE. HE FELL OFF THE SCAFFOLD BOARD FOUR FEET TO THE BOTTOM OF THE CRUSHER RINGS LANDING OFF THE SCAFFOLD BOARD FOUR FEET TO THE BOTTOM OF THE CRUSHER RINGS LANDING ON HIS LEF