NTSB Identification: CHI86LA055.
The docket is stored on NTSB microfiche number 29698.
Accident occurred Tuesday, December 31, 1985 in GRYGLA, MN
Aircraft: CESSNA 170A, registration: N3828V
Injuries: 2 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 AIRCRAFT HAD BEEN FITTED WITH OWNER INSTALLD SKIS. DURING LANDING THE LEFT SKI SEPARATES FROM ITS MOUNT ALLOWING THE LEFT SKI MOUNT TO DIG INTO THE SNOW COVERED RUNWAY. THE RIGHT WINGTIP STRUCK A SNOWBANK AND THE AIRCRAFT CAME TO REST ON ITS NOSE. THE PILOT STATED THAT THE SKI MOUNT RETAINING WASHER WAS MISSING ALLOWING THE SKI MOUNT TO SLIDE OVER THE RETAINING NUT AND COTTER PIN ON THE AXLE END.HE FURTHER STATED THAT IT WAS EITHER AN OVERSIGHT DURING PREFLIGHT, OR THAT THE WASHER COULD HAVE COME OFF DURING THE LAST LAST FLIGHT.

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

MAINTENANCE,INSTALLATION..IMPROPER..PILOT IN COMMAND



Contributing Factors

LANDING GEAR,SKI ASSEMBLY..SEPARATION


Contributing Factors

AIRCRAFT PREFLIGHT..INADEQUATE..PILOT IN COMMAND

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