Fatal Aircraft Crash in British Columbia Mountains Linked to Terrain and Performance Factors

Casualties unknown • Pemberton, British Columbia, 8 nm NE, CA

A modified Cessna T207A crashed into a mountain slope in British Columbia during a repositioning flight, resulting in the death of the pilot.

What happened

On a flight from Pemberton Airport to Edmonton, a highly modified Cessna T207A, registered C-GGQR, entered a mountain pass route near Joffre Creek. The aircraft, which was configured with specialized equipment pods for air quality research, was performing a repositioning flight. During the climb, the aircraft encountered steeply rising terrain. As the pilot attempted to reverse course to avoid the approaching peaks, the aircraft entered a steep, descending left turn. The aircraft struck treetops and subsequently hit the sloping ground, where a post-crash fire consumed much of the airframe. The pilot was fatally injured.

The investigation

Investigators examined the wreckage and the environmental conditions at the site. The investigation established that the aircraft's engine was producing significant power at the time of impact, as evidenced by damage to the propeller blades. The aircraft was operating under a special flight permit and was carrying heavy modifications, including laser probe pods and electronic equipment. The investigation also looked into the weather, noting that the site was in a large shadow region, which can contribute to the formation of katabatic winds or downdraughts. Additionally, the investigation reviewed the pilot's training and the regulatory framework for modified aircraft operating under special permits.

Findings

  • The pilot entered the valley at an altitude that did not allow for sufficient clearance of the terrain, given the aircraft's specific performance capabilities.
  • While attempting to reverse course due to the rising terrain, the pilot likely experienced false horizon and relative scale illusions.
  • The combination of the aircraft's high weight, increased drag from external equipment, high density altitude, and down-flowing winds made it impossible to clear the terrain during the maneuver.
  • The lack of a detailed flight plan meant that the presence of specialized equipment was not reported, which could impact search and rescue operations.
  • The aircraft was operating at an increased weight allowance that had not been formally incorporated into the official Transport Canada flight authority.

Probable cause

The aircraft collided with terrain during a reversal maneuver because the pilot's altitude was insufficient to clear the rising mountains, a situation exacerbated by the aircraft's heavy configuration, high density altitude, and the presence of downdraughts.

Frequently asked questions

What happened in the 2006-05-18 Cessna T207A C-GGQR accident near Pemberton, British Columbia, 8 nm NE, CA?

A modified Cessna T207A crashed into a mountain slope in British Columbia during a repositioning flight, resulting in the death of the pilot.

What aircraft was involved and where did it happen?

The accident on 2006-05-18 involved a Cessna T207A C-GGQR, operated by Niagara Air Tours Ltd., at Pemberton, British Columbia, 8 nm NE, CA.

What was the probable cause of the accident?

The aircraft collided with terrain during a reversal maneuver because the pilot's altitude was insufficient to clear the rising mountains, a situation exacerbated by the aircraft's heavy configuration, high density altitude, and the presence of downdraughts.

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