Robinson Helicopter R44 N828PM accident near Ocate, New Mexico

Probable cause

The pilot’s failure to apply carburetor heat, which resulted in the formation of carburetor ice and a partial loss of engine power.

NTSB analysis

The helicopter was about 80 to 150 feet above ground level with the airspeed about 10 to 15 knots, when the pilot got a low rotor rpm warning, and the engine lost power. The pilot lowered the collective pitch lever, put in right pedal, and kept “full throttle.” The helicopter made two to three complete 360 degree turns before it impacted terrain. According to a carburetor icing probability chart, an engine operating in the ambient conditions at the time of the accident could expect a serious risk of carburetor icing while at cruise power. The pilot reported that he had possibly failed to use enough carburetor heat and he thought that was the reason for the loss of engine power. An examination of the helicopter showed no preimpact mechanical failures or anomalies that would have precluded normal operation.

Text from the NTSB. Open the NTSB docket for CEN11LA648 for the full record.