NTSB Identification: ANC90LA023.
The docket is stored on NTSB microfiche number 39714.
Accident occurred Friday, December 29, 1989 in TANANA, AK
Probable Cause Approval Date: 09/05/1990
Aircraft: Champion 7ECA, registration: N7615S
Injuries: 1 Uninjured.

NTSB investigators may not have traveled in support of this investigation and used data provided by various sources to prepare this aircraft accident report.

THE PILOT REPORTED THAT HE WAS USING HIS AIRPLANE TO TEND HIS TRAP LINE. SHORTLY AFTER TOUCH DOWN ON A FROZEN, SNOW COVERED LAKE, THE RIGHT MAIN GEAR AXLE BOLT (HOLDING THE SKI TO THE GEAR LEG) FAILED. THE SKI THEN SEPARATED FROM THE GEAR LEG AND THE AIRPLANE WAS FURTHER DAMAGED BEFORE IT CAME TO REST. THE PILOT BELIEVED THE AXLE BOLT HAD FAILED DUE TO THE CUMULATIVE EFFECTS OF CONSISTENTLY LANDING ON ROUGH TERRAIN. ACCORDING TO HIM, THERE WAS NO INHERENT FLAW OR DESIGN PROBLEM WITH THE AXLE BOLT.

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

FAILURE OF THE RIGHT MAIN GEAR AXLE BOLT.

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