Primary finding
Probable cause
An in-flight collision with a bird while in cruise flight.
Investigator assessment
Analysis narrative
The pilot in the helicopter reported that, during cruise flight at dusk with night vision goggles on, he encountered a flock of birds at 1,500 ft above ground level. As the pilot initiated a climbing left turn to avoid the birds, he heard a loud bang accompanied by a pain in his left leg. The helicopter then began to vibrate, and the pilot initiated a precautionary landing in a nearby field without further incident. Bird remains were located throughout the pilot side of the cockpit. The helicopter sustained substantial damage to the windshield. The pilot reported that there were no preaccident mechanical malfunctions or failures with the helicopter that would have precluded normal operation.