NTSB Identification: ANC02LA026.
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Accident occurred Friday, March 29, 2002 in Big Lake, AK
Probable Cause Approval Date: 08/26/2002
Aircraft: Interstate S-1B1, registration: N48027
Injuries: 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.

Shortly after takeoff from a remote airstrip, the pilot noted a loss of engine power, and smoke in the cockpit. While attempting to return to the airstrip, the engine lost all power, and the pilot was forced to land on a snow-covered field. During landing, the main wheels broke through the crusted snow, and the airplane nosed over. A postaccident inspection disclosed that the exhaust stack had separated from the cabin heater's heat exchanger. The hot exhaust gasses burned associated ducts, wires, and the lower engine cowling.

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

The separation of the exhaust system stack from the heat exchanger. A factor associated with the accident was an engine compartment fire.

Full narrative available

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