The pilot reported that, after landing on a snow-covered, off-airport landing site in Big Lake, Alaska, he was positioning the Cessna 180 for parking. He added that the left ski broke through the ice, followed by the right ski.
He reported that he had not seen the area of “soft/thin” ice before taxiing.
The airplane sustained substantial damage to the fuselage.
The pilot reported that there were no preaccident mechanical failures or malfunctions with the airplane that would have precluded normal operation.
Probable cause: The pilot’s selection of unsuitable terrain for landing, which led to both skis breaking through the ice while positioning the airplane after landing.
NTSB Identification: GAA18CA136
This February 2018 accident report is provided by the National Transportation Safety Board. Published as an educational tool, it is intended to help pilots learn from the misfortunes of others.