INITIAL CAVE FROM LONGWALL STARTUP CAUSED AIR BLAST THAT DAMAGED SEVERAL STOPPINGS IN RETURN AREA OF LONGWALL. VENTILATION WAS CHANGED DUE TO THE AIR BLAST. 77,000 CFM WAS STILL MAINTAINED ALO NG FACE AREA. STOPPINGS WERE REPAIRED, VENTILATION RESTORED, MINING RESUMED. NO ACCIDENTS OF INJURIES.