NTSB Identification: CEN12LA230
14 CFR Part 91: General Aviation
Accident occurred Thursday, April 05, 2012 in Isabel, SD
Probable Cause Approval Date: 12/05/2013
Aircraft: ROBINSON HELICOPTER R22 BETA, registration: N104MH
Injuries: 1 Serious,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.

While maneuvering at low altitude during a coyote hunting operation, the helicopter experienced a partial loss of engine power. The helicopter descended, impacted trees and terrain, and rolled on its right side. There was a minor fuel leak but no postimpact fire. A postaccident examination of the helicopter did not reveal any evidence of preimpact mechanical malfunction or failures that would have precluded normal operation. Based on the temperature and dew point about the time of the accident, the conditions were conducive to serious carburetor icing at any power setting. The pilot reported that he was unsure if he had used carburetor heat for the accident flight. Available evidence suggests that the engine partially lost power in the absence of carburetor heat while operating in conditions conducive to carburetor icing.

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

The partial loss of engine power due to carburetor ice.

Full narrative available

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