NTSB Identification: LAX99LA305.
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Accident occurred Sunday, September 12, 1999 in KLAMATH, CA
Probable Cause Approval Date: 08/13/2001
Aircraft: Cessna 182J, registration: N3348F
Injuries: 1 Minor,1 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.

The pilot received a weather briefing from FSS the evening before departure and a friend at the destination told him that the area had been free of fog for the last several days. Upon descent to 1,500 feet at the destination, he could not spot the airport due to a fog layer. He decided to divert to his alternate. After turning toward the alternate airport, the engine began to run roughly. The pilot was unable to remedy the power loss by applying carburetor heat, switching fuel tanks, leaning the mixture, and checking the magnetos in the both position. As he turned back toward his original destination airport, the engine continued to run rough and he was unable to arrest the airplane's descent. He was just above the fog layer, saw the runway through the fog, and turned back to the runway. During the turn, he went into the fog and the airplane collided with treetops and lodged in branches. The occupants noticed fire in the floorboard area, exited through the pilot's door, and jumped to the ground. The fuselage was consumed by fire. Witnesses on the ground heard the airplane circle the area twice at a low altitude, but did not hear any change of engine sound. The temperature/dew point was in an area of a carburetor icing probability chart annotated, 'serious carburetor icing with cruise or climb power.' The FAA publication, 'Tips on Winter Flying,' recommends that carburetor heat be applied prior to reducing power.

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

A loss of engine power due to carburetor icing and the pilot's failure to use carburetor heat in conditions conducive to icing.

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