MIA82IA110

Factual narrative

WHILE CRUISING AT 8000 FEET, THE RIGHT ALTERNATOR LIGHT CAME ON AND THE PILOT ACCOMPLISHED THE REQUIRED PROCEDURES FOR AN ALTERNATOR FAILURE. SHORTLY THEREAFTER, HE NOTICED AN AREA OF DISCOLORATION ON THE INBOARD NACELLE OF THE RIGHT ENGINE AND SAW FLAMES INSIDE THE NACELLE. THE PILOT SECURED THE ENGINE, DECLARED AN EMERGENCY AND MADE A SINGLE ENGINE LANDING AT TALLAHASSEE, FL. EXAMINATION OF THE ENGINE REVEALED A BROKEN TURBOCHARGER EXHAUST CLAMP WHICH ALLOWED THE EXHAUST TUBE TO SEPARATE FROM THE TURBO. HIGH TEMPERATURE EXHAUST GASES THEN STARTED THE FIRE WHICH DISABLED THE ALTERNATOR WIRING. METALLURGICAL EXAMINATION OF THIS CLAMP AND SEVERAL OTHERS THAT HAD FAILED INDICATED THAT THE FAILURES WERE DUE TO HIGH TEMPERATURE EMBRITTLEMENT. THE LACK OF HIGH TEMPERATURE DUCTILITY WAS ATTRIBUTED TO IMPROPER HEAT TREATMENT WHEN THE CLAMPS WERE MANUFACTURED. Source: NTSB Aviation Accident Database (Pre-2008 Archive) Retrieved: 2026-02-12