NTSB Identification: ATL85FA079.
The docket is stored on NTSB microfiche number 28554.
Accident occurred Thursday, January 17, 1985 in JOHNSON CITY, TN
Aircraft: CESSNA 340, registration: N4124Q
Injuries: 3 Fatal.

NTSB investigators either traveled in support of this investigation or conducted a significant amount of investigative work without any travel, and used data obtained from various sources to prepare this aircraft accident report.

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.

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

ENGINE ASSEMBLY,CYLINDER..CRACKED

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

IGNITION SYSTEM,MAGNETO..CRACKED

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

FLIGHT CONTROLS..IMPROPER USE OF..PILOT IN COMMAND

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

REMEDIAL ACTION..NOT UNDERSTOOD..PILOT IN COMMAND

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

HAZARDOUS WEATHER ADVISORY..DISREGARDED..PILOT IN COMMAND

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

MAINTENANCE,INSPECTION..INADEQUATE..OTHER MAINTENANCE PERSONNEL

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

PREFLIGHT BRIEFING SERVICE..DISREGARDED..PILOT IN COMMAND

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

IGNITION SYSTEM,DISTRIBUTOR..ARCING

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

AIRSPEED(VMC)..NOT IDENTIFIED..PILOT IN COMMAND

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

WEATHER EVALUATION..NOT PERFORMED..PILOT IN COMMAND

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

DESCENT..IMPROPER..PILOT IN COMMAND


Contributing Factors

WEATHER CONDITION..ICING CONDITIONS


Contributing Factors

GEAR EXTENSION..IMPROPER..PILOT IN COMMAND


Contributing Factors

LOWERING OF FLAPS..NOT SELECTED..PILOT IN COMMAND


Contributing Factors

MANEUVER..IMPROPER..PILOT IN COMMAND


Contributing Factors

MATERIAL DEFECT..PRODUCTION/DESIGN PERSONNEL


Contributing Factors

WEATHER CONDITION..TURBULENCE



Contributing Factors

WEATHER CONDITION..CLOUDS


Contributing Factors

WEATHER CONDITION..LOW CEILING

Index for Jan1985 | Index of months