What happened
On the evening of December 3, 2008, a privately operated Robinson R44 Raven I helicopter, registration C-GSVX, departed Sainte-Anne-des-Plaines, Quebec, for a night flight to a cottage at Lac Simon. The aircraft was carrying the pilot and three passengers. The flight was intended to be a routine night visual flight rules trip to the pilot's property.
As the helicopter approached the landing pad at the cottage, the pilot executed a right-hand turn onto the final approach leg at an altitude of approximately 150 feet above the lake. During this maneuver, the aircraft descended below the intended glide path and struck the water. The impact caused the helicopter to flip onto its left side and sink in 25 feet of water.
While all four occupants managed to evacuate the sinking aircraft through the right-side doors, they were forced to swim approximately 1000 feet through near-freezing water toward the shore. Two passengers reached safety, but the pilot and one passenger drowned due to the extreme cold and the physical exhaustion of the swim.
The investigation
Investigators examined the aircraft wreckage and the flight environment. The Robinson R44 sustained structural damage to the engine support area and the tail boom. Although the emergency locator transmitter (ELT) activated, it was unable to transmit a signal to search-and-rescue units, likely because the unit was rapidly submerged.
The investigation focused on the visual conditions during the approach. The landing pad was marked only by three functional, low-intensity LED lights and a nearby bonfire, which provided insufficient illumination of the surrounding area. The lack of surrounding lights from nearby dwellings meant there were almost no visual cues to help the pilot judge altitude and descent rate.
Findings
- The black hole illusion likely caused the pilot to believe the helicopter was at a higher altitude than it actually was, leading to an approach path that was too low.
- The lack of visual cues over the dark, featureless surface of the lake prevented the pilot from accurately assessing the aircraft's descent.
- The absence of personal flotation devices on board increased the risk to the occupants during the water evacuation.
- Current regulations do not mandate specific lighting standards or approach aids for private helipads, which can increase risks during night operations.
- The minimum training requirements for a private helicopter night rating may not sufficiently prepare pilots for the specific risks of visual illusions encountered in unlit environments.