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Aviation Accident


NTSB Identification: CEN13CA187
14 CFR Part 91: General Aviation
Accident occurred Saturday, February 02, 2013 in Oshkosh, WI
Probable Cause Approval Date: 07/29/2013
Aircraft: CHAMPION 7GCAA, registration: N9691S
Injuries: 2 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.

After performing three touch-and-go landings on a frozen lake, the pilot set up for a full stop landing on the plowed surface of the frozen lake. After a smooth landing, and while taxiing to park, the left wheel strut collapsed. The airplane tipped over onto its left side, resulting in substantial damage to the left wing spar. Examination of the airplane after the accident revealed evidence of fatigue cracking on the failed portion of the left wheel strut mount. The airplane had been flown about 50-75 hours after its last annual inspection with no problems noted by the owner. The pilot stated that he lands on frozen lakes frequently and that the collapse of the landing gear was unexpected.


The National Transportation Safety Board determines the probable cause(s) of this accident as follows:
  • Fatigue cracking and failure of the left wheel strut mount resulting in collapse of the left main landing gear during taxi.