The helicopter pilot reported that, while maneuvering at a low altitude the main rotor blades struck power lines. He executed an emergency landing without further incident. The pilot added that the power lines were concealed by the sun and that the power lines were not annotated in his VFR sectional chart.

The helicopter sustained substantial damage to the main rotor blades.

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