Incident Details
The owner of the helicopter, who was not rated in rotorcraft, and a flight instructor conducted a dual instructional flight with both doors removed from the helicopter. After the flight, the owner hovered to a concrete pad in front of the hangar and landed. Moderate rain was falling as the owner reached for the checklist to shut down the engine.
Sequence of Events
The flight instructor told the owner not to shut down the engine, stating his intention to taxi the helicopter inside the hangar to avoid getting wet. The owner said "No" and explained that it would take only a minute to obtain and install the helicopter doors. Despite the owner's objection, the flight instructor took the controls and began to hover taxi the helicopter into the hangar with the skids close to the ground.
As the helicopter was inside the hangar, the owner stated that he "felt a gust or slight updraft." At that moment, the main rotor blades impacted the top structure of the hangar, resulting in the destruction of all three main rotor blades.
Damage
The accident destroyed all three main rotor blades. No other damage was reported in the source.