NTSB Identification: CHI06CA066.
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Accident occurred Saturday, January 14, 2006 in Hibbing, MN
Probable Cause Approval Date: 04/25/2006
Aircraft: Cessna 120, registration: N76203
Injuries: 1 Uninjured.
NTSB investigators used data provided by various entities, including, but not limited to, the Federal Aviation Administration and/or the operator and did not travel in support of this investigation to prepare this aircraft accident report.
The ski equipped airplane nosed over while landing on a frozen lake. The pilot reported that when he departed another seaplane base, the surface was very rough due to frozen slush created by snow mobiles. He reported that when he touched down on the frozen lake, he heard a "loud grinding" noise and the airplane slowed down rapidly. The pilot stated that the grinding noise stopped then started again only much louder. He reported that the nose of the airplane dropped and the propeller contacted the ice. The pilot reported that the airplane then dropped to the right and flipped over onto its back. The pilot reported that the ground track from the left ski was "rounded" at initial touchdown followed by a space then a much narrower and deeper track. He reported that the four quarter-inch bolts sheared off between the axle and the gear leg on the left ski.
The National Transportation Safety Board determines the probable cause(s) of this accident to be: The pilot used a rough frozen lake for takeoff which resulted in the overload failure of the landing ski. A factor was the rough frozen lake. Full narrative available
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