NTSB Identification: CEN10CA317
14 CFR Part 91: General Aviation
Accident occurred Sunday, June 13, 2010 in Plymouth, MI
Probable Cause Approval Date: 12/20/2010
Aircraft: BELL 47G, registration: N47WK
Injuries: 1 Uninjured.

NTSB investigators used data provided by various entities, including, but not limited to, the Federal Aviation Administration and/or the operator and did not travel in support of this investigation to prepare this aircraft accident report.

The helicopter experienced a total loss of engine power about 2 miles northeast of the departure airport. The pilot then performed an autorotation onto a grass area. The helicopter sustained substantial damage, including damage to the main rotor blades and left side of the fuselage. The pilot was uninjured. Examination of the helicopter revealed no anomalies that would have precluded normal operation. A carburetor temperature gauge had been installed in the helicopter. The pilot stated that he did not use carburetor heat during or after the takeoff from the departure airport. Weather conditions at the time winds 290 degrees at 9 knots, gusts to 17 knots, 10 statute miles, 2,900 feet overcast, temperature 23 degrees Celsius, dew point 17 degrees Celsius, and altimeter 30.00 inches. According to the Carburetor Icing Probability Chart, the conditions were conducive to serious icing at glide power.

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

The pilot's failure to use carburetor heat, which led to carburetor icing and a loss of engine power following takeoff.

Full narrative available

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