On October 15, 1994, a Cessna A185F (registration N20752) was involved in an aviation accident near Kotzebue, AK. Investigators recorded the probable cause as: The pilot's failure to maintain visual contact with the taxi path due to flat lighting and low contrast, which resulted in the right ski contacting a snow berm and the subsequent left wing strike. This summary draws on records from the U.S. National Transportation Safety Board (NTSB) historical archive.
A wheel/ski equipped aircraft sustained damage when the right ski hit a snow berm during taxi for an on-demand air taxi flight, causing the plane to pivot and strike a snow bank.
What happened
The pilot was conducting pre-flight preparations for an on-demand air taxi flight. The aircraft, equipped with both wheels and skis, was being taxied toward the takeoff position. During this maneuver, the right ski made contact with a raised snow berm. This impact caused the aircraft to pivot sharply. As the plane turned, the left wing struck a nearby snow bank.
The pilot later explained that environmental conditions played a significant role in the incident. Flat lighting and low contrast between the snow berm and the surrounding terrain made it difficult to distinguish the obstacle from the ground.
The investigation
Examination of the aircraft confirmed damage to the left wing resulting from the contact with the snow bank. The right ski was found to have impacted the snow berm during the taxi phase.
Findings
The right ski contacted a snow berm during taxi for takeoff.
The aircraft pivoted after the initial ski impact.
The left wing struck a snow bank as a result of the pivot.
Flat lighting conditions reduced visibility of terrain features.
Low contrast between the snow berm and surrounding terrain hindered pilot perception.
Probable cause
The pilot's failure to maintain visual contact with the taxi path due to flat lighting and low contrast, which resulted in the right ski contacting a snow berm and the subsequent left wing strike.