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NTSB Report
January 17, 1985 · Cessna 340 · N4124Q
Johnson City, TN
Overview
Report Status
Preliminary report
Event Type
Accident
Date
January 17, 1985
Injury Outcomes
3 injuries (3 fatalities)
Location
Johnson City, TN
Aircraft
Cessna 340
Tail Number
N4124Q
Injuries
Fatal
Aircraft Damage
Destroyed
NTSB Number
ATL85FA079
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.
Full Narrative
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.
Flight
Event TypeAccident
Event Time00:57 EST
Nearest Airport12nm S
Runway0
Runway Length0
Runway Width0
Flight Plan FiledIFR
Aircraft FireGrd
Aircraft ExplosionNo
Aircraft
AircraftCessna 340
Tail NumberN4124Q
Aircraft CategoryAir
DamageDestroyed
Operating RulePart 91
Engines2
Engine TypeReciprocating
Engine DetailsContinental · TSIO-520-J · Reciprocating · 310
Seats6
People & Injuries
Injury Summary3 injuries (3 fatalities)
Fatal3
Serious0
Minor0
Uninjured0
Total3
Crew 1Age 54 · Third Class
Conditions
ConditionsVMC
LightDark Night
Wind320° @ 3 kt
Visibility5 sm
CeilingOvercast 3000 ft
Temperature / Dew Point30 C / 25 C
Altimeter29.00 inHg
Observation Time05:43
Weather SourceWFAC