JOHNSON CITY, TN, USA
N4124Q
CESSNA 340
THE ACFT WAS IFR AT 17000 FT FLYING THRU WX SIGMET AREA FOR SEVERE ICING WHEN THE PLT REQUESTED A DESCENT DUE TO AIRFRAME ICE AND TURBULENCE. DURING THE DESCENT THE PLT REPORTED SHUTTING DOWN THE RIGHT ENG. ON FINAL APCH FOR AN OFF-ARPT LANDING ATTEMPT THE ACFT STALLED AND SPUN TO GROUND CONTACT. CHUNKS OF ICE WERE FOUND NEAR THE WRECKAGE. POST IMPACT EXAM OF THE RIGHT ENG REVEALED CRACKS IN THE #2, #5 AND #4 CYLINDERS. THE #4 CYLINDER HAD BURNED THRU AT THE EXHAUST PORT. THE RIGHT MAGNETO HAD UNACCEPTABLE OUTER CASE FRACTURES WHICH WERE FILLED WITH A RUBBER LIKE SEALANT. THE DISTRIBUTOR BLOCK HAD EVIDENCE OF SEVERE DESTRUCTIVE ARCING AND CROSSFIRING. NO DOCUMENTATION OF COMPLIANCE WITH BENDIX SERVICE BULLETIN NO. 612 DEALING WITH INSPECTION OF THE MAGNETOS WAS FOUND. THE RIGHT ENG PROP WAS NOT IN THE FEATHERED POSTITION.
Source: NTSB Aviation Accident Database
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