N533DRHughes Helicopters HUGHES 369D · 1979

The pilot reported that, during an aerial application pass in a helicopter, he failed to observe a second lower powerline near a previously observed high-tension powerline. The pilot attempted to maneuver under the lower powerline but was unsuccessful, and the helicopter impacted the lower powerline and subsequently the terrain. The helicopter sustained substantial damage to the main rotor system, the tail boom, and the tail rotor system. The pilot reported there were no preaccident mechanical failures or malfunctions with the helicopter that would have precluded normal operation.