DURING A WEEKLY EXAM, THE ROOF FALLS WERE DISCOVERED IN THE RETURN ENTRIES AT SPAD 622 AND 646. THERE WERE NO INJURIES AND THE TRAVELWAY AND AIRWAYS WERE NOT AFFECTED. THE FALL WAS APPROXIMATE LY 60 FEET LONG, 18 FEET WIDE, AND 4 FEET HIGH IN THE #2 HEADING. AND APPROXIMATELY 25 FEET LONG, 18 FEET WIDE, AND 4 FEET HIGH IN THE #3 HEADING.