NTSB Identification: CHI94LA037.
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Accident occurred Sunday, November 14, 1993 in ARCADIA, WI
Probable Cause Approval Date: 09/13/1994
Aircraft: Grumman American AA-1B, registration: N9896L
Injuries: 1 Serious,1 Minor.

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

THE PILOT STATED THE AIRPLANE WAS IN CRUISE FLIGHT AT 2000 FEET WHEN THE ENGINE BEGAN TO RUN ROUGH AND LOSE POWER. THE PILOT PERFORMED EMERGENCY PROCEDURES (APPLIED CARBURETOR HEAT, CHANGED FUEL TANKS, AND TRIED LEFT AND THEN RIGHT MAGNETOS) TO NO AVAIL. THE ENGINE LOST POWER COMPLETELY JUST AS THE PILOT DECLARED AN EMERGENCY ON RADIO FREQUENCY 121.5 MHZ. THE PILOT PREPARED FOR A NIGHT FORCED LANDING WHEN THE AIRCRAFT IMPACTED AND BECAME ENTANGLED IN A GROUP OF 50 FOOT OAK TREES. ENGINE CONTINUITY, COMPRESSION, IGNITION, INDUCTION AND FUEL SYSTEMS WERE FIELD TESTED. NO DEFECTS WERE FOUND. THE SPARK PLUGS WERE ALL COVERED WITH BLACK SOOTY DEPOSITS. A CARBURETOR ICING PROBABILITY CHART OBTAINED FROM A DOT/FAA/CT-82/44 PUBLICATION PREDICTS SERIOUS ICING AT CRUISE POWER WITH THE WEATHER CONDITIONS EXISTING AT THE TIME OF THE ACCIDENT (TEMPERATURE 40 DEGREES FAHRENHEIT, DEW POINT OF 38 DEGREES FAHRENHEIT).

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

the loss of engine power for an undetermined reason(s).

Full narrative available

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