A FALL OF ROOF OCCURRED ON THE 21 BUTT SECTION LONGWALL PANEL IN THE #21 CROSSCUT BETWEEN #1 ENTRY AND #2 ENTRY. FALL WAS 15 FT WIDE X 10 FT HIGHX 40-50 FT LONG. AREA SUPPORT TO PLAN WITH ADDI TIONAL SUPPORTS SET. NO INJURIES, NO DAMAGE TO EQUIPMENT.