UNINTENTIONAL ROOF FALL OCCURRED IN E-9A MAINS IN N-3 ENTRY 2 BREAKS INBY SPAD 9729. FALL MEASURED 18'WIDE X 4'LONG X 15'HIGH. FALL EXTENDED ON 12/30/03 FOR AN ADDITIONAL 8' IN LENGTH. THE CON TINUATION PARTIALLY BLOCKED THE PRIMARY INTAKE ESCAPEWAY FOR THE 007-0 MMU. PRODUCTION WAS STOPPED & THOSE AFFECTED WERE WITHDRAWN UNTIL THE ESCAPEWAY COULD BE RE-ESTABLISHED AFTER ABOUT 1 HR