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The Transportation Safety Board of Canada (TSB) has released its investigation report (A11P0106) into the July 2011 collision with terrain of a Cessna 152 near Harrison Lake, B.C.
On 5 July 2011, a Pacific Flying Club Cessna 152, with a flight instructor and student pilot on board, departed Boundary Bay, B.C., for a mountain training flight. An hour and a half after departure, the aircraft collided with terrain about 10 nautical miles west of Harrison Lake. The aircraft was destroyed by impact forces, and both occupants of the aircraft died.
The investigation found that the accident was likely caused by an aerodynamic stall while attempting a turn at an altitude from which the pilots could not recover before colliding with the mountain. Without proper training in mountain flying techniques, pilots and passengers are exposed to increased risk of collision with terrain due to the complex nature of mountain flying.
Following the occurrence, Pacific Flying Club implemented safety actions. Among them are:
-The creation of a formal, regimented Mountain Flying Training Syllabus, and training for all instructors that includes defined procedures for canyon turns, minimum altitudes, mandatory routing, and standard operating procedures.
-Modifications to the Mountain Flying Program, including a ground school prior to flight, prescribed new routing, and the use of flight training devices to enhance pilot awareness of hazards.
