What was found
FORWARD LOWER CARGO FIRE INDICATED IN FLIGHT. EXTINGUISHING AGENT FIRED INTO COMPARTMENT. *S/D* FOUND NO EVIDENCE OF FIRE IN FWD CARGO COMPT. BOTH SMOKE DETECTORS REPLACED FOR PRECAUTIONARY REASONS. SUBSEQUENT SHOP FINDINGS INDICATE ONE OF THE TWO DETECTORS HAD A LAMP BURNED OUT CAUSING A FIRE CONDITION. ENGINEERING VIEWS THIS AS AN ISOLATED INCIDENT. FUTURE MAINTENANCE PROGRAM UNDER DISCUSSION TO REPLACE SMOKE DETECTOR BULBS ON A ROUTINE SCHEDULE TO PREVENT SUCH OCCURRENCES. PRESENTLY, THE EXISTING MAINTENANCE MANUAL HAS INSTRUCTIONS TO REMOVE AND INSTALL THE BULBS IN EACH SMOKE DETECTOR.