Pilot Debrief

ROBINSON HELICOPTER COMPANY R44 II near Dustin, OK — 2021-03-26

Final reportCEN21LA173
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Date
2021-03-26
Location
Dustin, OK, USA
Aircraft
ROBINSON HELICOPTER COMPANY R44 II
Registration
N178DF
Category
Helicopter
Highest injury
Serious
Fatalities
0

Probable cause

The pilot’s insufficient monitoring of the helicopter’s power while flying at low altitude and at low airspeed, which resulted in the loss of rotor rpm and impact with a tree and terrain.

NTSB narrative

The pilot of the helicopter stated that, while maneuvering “low and slow” with three passengers onboard, he noticed “insufficient power” and shortly thereafter, the low rotor rpm warning annunciated. He applied full throttle and attempted to regain rotor rpm but was unsuccessful. The pilot stated that he was forced to land immediately, during which the helicopter impacted a tree then terrain, resulting in substantial damage. The pilot reported that there were no mechanical malfunctions or failures of the helicopter and recommended operating “at a lower gross weight.” Postacccident examination of the helicopter revealed no anomalies that would have precluded normal operation.

NTSB coding

Evidence available

  • Photos
  • 5 docket documents
View NTSB final reportView NTSB docket

Docket documents5

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