Robinson Helicopter R44 N225ML accident near Bryant, Iowa

Probable cause

A loss of engine power during takeoff for reasons that could not be determined, resulting in impact with terrain.

NTSB analysis

After takeoff from an agricultural load truck in a helicopter loaded with mixed liquid product to apply to a corn field, the pilot noticed a drop in rotor rpm. The pilot followed an area of terrain that sloped downward in an attempt to gain airspeed. The pilot attempted to increase rotor rpm but was unsuccessful. The pilot flared the helicopter while attempting to land; however, the helicopter impacted an area of rising terrain and came to rest on its left side. The pilot was able to exit the helicopter without further incident. The helicopter sustained substantial damage to the fuselage, main rotor system, tail cone, and tail rotor system.

Examination of the helicopter and engine revealed no indication of a pre-impact malfunction or failure that would have precluded normal operation. The governor system components were tested and no failures or malfunctions were found.

Although the atmospheric conditions at the time of the accident were conducive to serious icing at glide power, the reported power loss occurred while at takeoff power. Based on the available evidence, the reason for the loss of engine power described by the pilot could not be determined.

Text from the NTSB. Open the NTSB docket for CEN24LA303 for the full record.