What happened
Following landing on a snow-covered, frozen lake, the pilot initiated taxi procedures toward a designated parking area. During this phase of ground movement, the aircraft encountered a patch of smooth ice concealed beneath the snow surface. This loss of traction caused the aircraft to slide sideways.
As the slide continued, the right ski descended through an overflow section on the ice. The impact and subsequent stress resulted in damage to the right wing spar, the aileron, and the elevator.
The investigation
Examination of the accident site and aircraft revealed that the taxiing surface consisted of a frozen lake covered with snow. A specific area of smooth ice was present beneath the snowpack, creating a hazardous condition for ski-equipped operations. The right ski penetrated an overflow zone on the ice, leading to structural failure of the control surfaces and wing component.
Findings
- Surface condition: Snow-covered frozen lake with underlying smooth ice patches.
- Phase of flight: Taxiing after landing.
- Mechanical damage: Right wing spar, aileron, and elevator were damaged due to the ski dropping through the ice.