LOADER OPERATOR SHUT DOWN PRIMARY SYSTEM TO CLEAN HAMMERMILL BREAKER PLATE AREA. THIS ACTION WILL AUTOMATICALLY SHUT OFF 2A BELT. HE DID NOT SHUT OFF THE FIRES TO THE VIBRATING PAN FEEDER WHIC H ARE LOCATED DIRECTLY ABOVE 2A BELT IN THE CRUDE PIT AREA. BECAUSE THE CLEANING TOOK LONGER THAN ANTICIPATED THE HEAT GENERATED FROM THE PAN FIRES IGNITED 2A BELT & THE SLIDER BED.