What happened
The pilot initiated a takeoff roll on a frozen lake surface that was covered with wet, soft snow. The conditions resulted in a takeoff roll that extended beyond the anticipated distance. Shortly after the aircraft became airborne, the left main landing gear wheel ski made contact with a snow berm. This impact caused substantial damage to the airplane structure.
The investigation
The investigation focused on the physical evidence of the accident site and the condition of the aircraft following the incident. Examination confirmed that the left main landing gear ski struck a snow berm during the initial climb phase. The structural damage was consistent with this specific impact event.
Findings
Several factors contributed to the outcome of the flight. The surface conditions on the frozen lake, specifically the wet and soft snow, increased the resistance during the takeoff roll. The presence of a snow berm near the takeoff path presented an obstacle that was struck shortly after liftoff. The pilot's report indicated that the extended ground roll may have reduced the margin for clearance over surface irregularities.
Safety message
Operators conducting winter operations on frozen bodies of water must carefully assess surface conditions, including snow depth and consistency. Pilots should anticipate longer takeoff rolls on soft snow and ensure adequate clearance from any potential obstacles such as snow berms or drifts near the intended flight path.