AN UNINTENTIONAL ROOF FALL WAS DISCOVERED DURING A WEEKLY AIR COURSE EXAM. THE FALL WAS FOUND IN THE #3 ENTRY ON THE 2 NORTH MAINS, #40 BLOCK ALONG #4 MAINLINE BELT. FOOTAGE MARK 77 + 75 IN A RETURN AIR COURSE. THE FALL HAS BEEN DANGERED OFF + CRIBBED. THE FALL MEASURED 30' X 18' X 7'