NTSB Identification: MIA82IA110
14 CFR Part 91: General Aviation
Incident occurred Friday, April 02, 1982 in TALLAHASSEE, FL
Probable Cause Approval Date: 04/02/1983
Aircraft: PIPER PA-31-350, registration: N41045
Injuries: 3 Uninjured.

NTSB investigators used data provided by various sources and may not have traveled in support of this investigation to prepare this aircraft incident report.

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.

The National Transportation Safety Board determines the probable cause(s) of this incident to be:

EXHAUST SYSTEM,CLAMP..BRITTLE FRACTURE

The National Transportation Safety Board determines the probable cause(s) of this incident to be:

MISCELLANEOUS..INADEQUATE..MANUFACTURER

The National Transportation Safety Board determines the probable cause(s) of this incident to be:

MATERIAL DEFECT(INADEQUATE QUALITY OF MATERIAL)..MANUFACTURER

Index for Apr1982 | Index of months