Primary finding
Probable cause
The pilot's failure to disconnect the ground power unit prior to takeoff.
Investigator assessment
Analysis narrative
The pilot stated that during takeoff from a dolly, the helicopter nosed down, contacted the ground, and collapsed the landing skids. Post-accident inspection revealed that the helicopter had not been disconnected from the ground power unit (GPU) prior to take off. The company did not have any written procedures regarding the placement or operation of the GPU. On this flight, the GPU had been placed behind the helicopter due to its "proximity to the taxiway." The pilot did not report any mechanical malfunctions or anomalies with the helicopter.
Source record
Factual narrative
The pilot stated that during takeoff from a dolly, the helicopter nosed down, contacted the ground, and collapsed the landing skids. Post-accident inspection revealed that the helicopter had not been disconnected from the ground power unit (GPU) prior to take off. The company did not have any written procedures regarding the placement or operation of the GPU. On this flight, the GPU had been placed behind the helicopter due to its "proximity to the taxiway." The pilot did not report any mechanical malfunctions or anomalies with the helicopter.