NTSB Identification: CHI85LA297.
The docket is stored on NTSB microfiche number 28693.
Accident occurred Saturday, July 13, 1985 in IOLA, WI
Aircraft: PIPER PA-22, registration: N1487A
Injuries: 3 Uninjured.

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

UPON TAKEOFF AT APPROXIMATELY 100 FT AGL THE PILOT EXPERIENCED A PARTIAL POWER LOSS WHICH NECESSITATED A FORCED LANDING IN A SOFT, WET POTATO FIELD. THE PILOT HAD TIME TO SWITCH FUEL TANKS AND MAGNETOS PRIOR TO TOUCHDOWN, BUT THE POWER LOSS REMAINED CONSTANT. UPON TOUCHDOWN THE AIRCRAFT FLIPPED OVER ON ITS BACK. THE PILOT STATED THAT THE PRE- TAKEOFF ENGINE RUN-UP AND MAGNETO CHECK WAS NORMAL. AN EXAMINATION OF THE ENGINE REVEALED THAT 5 OF THE 8 SPARK PLUGS WERE LEAD FOWLED. THREE WERE COMPLETELY SHORTED OUT AND TWO SPARKED INTERMITTENTLY. TWO OF THE MALFUNCTIONING PLUGS WERE ON THE SAME CYLINDER.

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

IGNITION SYSTEM,SPARK PLUG..LEADED

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

MAINTENANCE,INSPECTION..INADEQUATE..OTHER MAINTENANCE PERSONNEL


Contributing Factors

TERRAIN CONDITION..SOFT


Contributing Factors

DIRECTIONAL CONTROL..NOT POSSIBLE..PILOT IN COMMAND

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