NTSB Identification: ANC83LA063.
The docket is stored on NTSB microfiche number 22284.
Accident occurred Thursday, March 31, 1983 in NORTH POLE, AK
Aircraft: CESSNA 170B, registration: N1955C
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 PLT OF THE SKI EQUIPPED ACFT HAD TAKEN OFF FROM AN ABANDONDED STRIP THAT WAS IN A DETERIORATING CONDITION WITH ROCKS SCATTERED ALONG THE LANDING AREA. AFTER ARRIVING AT HIS DESTINATION, HE LANDED ON A WELL GRADED RWY WITH PACKED SNOW THAT WAS SUITABLE FOR EITHER WHEEL OR SKI OPERATION. AFTER TOUCHDOWN, THE ACFT BEGAN TO VEER TO THE LEFT. SUBSEQUENTLY, IT WENT OFF THE LEFT SIDE OF THE RWY & THE LEFT WING OF THE ACFT HIT THE LEFT WING OF A PIPER PA-12, N3140M. AFTER THAT, THE ACFT CONTINUED UNTIL IT STRUCK A SNOWBANK, THEN TRAVELED ABOUT 50 FT FURTHER BEFORE COMING TO REST. AN EXAM OF THE GEAR REVEALED THAT THE LEFT SKI WAS WORN. THE OVERLAYER WAS SCRAPED AWAY & APRX AN 18 INCH, OUTBOARD PORTION WAS BENT INWARD. THERE WAS EVIDENCE THAT THE SKI HAD HIT THE SNOWBANK WHILE THE LEFT WING WAS LOW CAUSING A TRANSVERSE FRACTURE & FAILURE OF THE LEFT AXLE (A NON-STANDARD C-185 AXLE). IMPROPER BOLTS HAD BEEN USED TO INSTALL THE NON-STANDARD AXLES & NO SHIMS HAD BEEN USED TO PROVIDE PROPER AXLE ALIGNMENT.

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

LANDING GEAR,SKI ASSEMBLY..WORN


Contributing Factors

LANDING GEAR,SKI ASSEMBLY..IMPROPER


Contributing Factors

OBJECT..AIRCRAFT PARKED/STANDING


Contributing Factors

TERRAIN CONDITION..SNOWBANK


Contributing Factors

MAINTENANCE,INSTALLATION..IMPROPER

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