What happened
On a day characterized by cloudy skies and rain showers, a Bell 20-6L (registration C-FRCL) operated by Quantum Helicopters Limited was performing long-line operations near Legate Creek, north of Terrace, British Columbia. The mission involved moving a drill rig on a steep hillside at approximately 4,200 feet above sea level.
After two successful lifts, the pilot attempted a third. During this maneuver, the aircraft descended into the valley and required two orbits to regain sufficient altitude for its approach. As the load reached roughly three feet above the drill deck, the helicopter dropped rapidly, causing the load to strike the deck with significant force. This impact caused the load to bounce back into the air, which in turn caused the helicopter to fishtail and spin. During this uncontrolled rotation, the tail boom was struck by the main rotor blades. The aircraft, still tethered to the load, moved in an arc before crashing into a cliffside, ending up in an inverted position. The pilot sustained one fatality.
The investigation
Investigators examined the wreckage and the flight dynamics of the accident. The investigation focused on the mechanical and operational factors following the determination that there was no evidence of progressive mechanical failure or weather-related issues.
Technical analysis centered on the phenomenon of collective bounce. Investigators looked at the interaction between the heavy load, the stretching of the long-line, and the pilot's physical position. The investigation also reviewed the aircraft's performance charts and the risks associated with operating with an open door and an unrestrained upper body during high-intensity maneuvers.