EE WAS TROUBLSHOOTING THE #3 SHUTTLE CAR WHICH HAD LOST ELECTRICAL POWER BEHIND THE CONTINUOUS MINER IN #6 ENTRY. EE WAS FACING THE SHUTTLE CAR WITH HIS BACK TOWARD THE RIB BEHIND THE REPAIRMAN ""WORKING"" AND TRIED TO GIVE A VERBAL WARNING. THE UPPER HALF OF RIB COLLAPSED AND FELL, KNOCKING HIM ON HIS LOWER BACK AND STRIKING HIS RIGHT FOOT.