Flight and Weather Conditions
The helicopter was conducting an air tour flight when the pilot encountered instrument meteorological conditions. During the flight, the pilot heard reports of poor weather along the intended flight path and elected to fly a different route to avoid the weather. The pilot flew above a scattered, thin layer of clouds, but weather conditions began changing rapidly. Clouds formed and closed in on the helicopter.
Accident Sequence
The pilot descended through a hole in the clouds in an attempt to regain visual conditions beneath the cloud deck. Once below the clouds, the weather continued to worsen as clouds and fog surrounded and engulfed the helicopter. While in instrument conditions, the pilot attempted to reverse course and climb. During this maneuver, the main rotor contacted trees. The helicopter began vibrating severely, and the pilot initiated an emergency landing. During touchdown, the right skid struck a boulder, causing the helicopter to roll onto its side.
Mechanical and Witness Information
No mechanical malfunctions were reported with the helicopter. A witness reported that just prior to the accident, weather conditions were sunny and clear. The witness stated that fog rapidly came in and surface visibility decreased to 4 feet. The witness further noted that rapidly changing weather is common to the area.
Investigation
The investigation focused on the sequence of events as the pilot encountered instrument conditions and attempted to reverse course, leading to the main rotor striking trees and the subsequent hard landing and rollover.