A ROOF FALL WAS DISCOVERED WHILE WALKING THE RETURN AIR COUSE WITH INSPECTORS. THE FALL MEASURED 33' X 17 1/2' X 5' THICK. IT FELL IN #2 ENTRY AT XCUT 27 IN THE 1 WEST RETURN. THE ROOF WAS WEA KENED BY DRIPPING WATER. IT DID NOT BLOCK PEOPLE, EQUIPMENT OR AIR.