The helicopter pilot reported that, he and the safety pilot were delivering fuel to a remote camp. During short final, with the safety pilot on controls, about 50 feet above the ground, the helicopter's rate of decent increased. The safety pilot raised the collective, but the helicopter continued to descend, and the main rotor RPM began to decay. The helicopter then yawed to the right, rolled to the left, and impacted terrain.

The helicopter sustained substantial damage to the fuselage and main rotor blades.

The helicopter pilot reported that there were no preaccident mechanical failures or malfunctions with the helicopter that would have precluded normal operation.