What was found
AFTER TAKE OFF FROM ANC, THE FIRE WARNING LIGHT ILLUMINATED AND THE AUDIO WARNING SOUNDED FOR THE NUMBER THREE ENGINE. THE FLIGHT CREW FOLLOWED COMPANY PROCEDURES AND SECURED THE ENGINE. THE FLIGHT RETURNED TO ANC FOR AN UNEVENTFUL LANDING. MAINTENANCE INSPECTED THE AIRCRAFT WHICH REVEALED THE DUCT ASSEMBLY FOR THE NINTH STAGE BLEED AIR RUPTURED. ADDITIONAL INSPECTION FOUND THE THRUST REVERSER INNER HEAT SHIELD WITH NOMINAL DAMAGED. MAINTENANCE REPLACED THE DUCTS AND PERFORMED SUCESSFUL OPERATIONAL CHECKS IN ACCORDANCE WITH THE DOUGLAS MAINTENANCE MANUAL. CFMI SUGGESTED MAINTENANCE PLACED THE THRUST REVERSER ON DEFERRAL IN INCORDANCE WITH COMPANCY PROCEDURES FOR REPAIRS AT THE NEXT MAINTENANCE STATION. MAINTE