Pilot Debrief

STINSON 108-2 near Port Alsworth, AK — 2010-08-29

Final reportANC10LA081
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Date
2010-08-29
Location
Port Alsworth, AK, USA
Aircraft
STINSON 108-2
Registration
N9569K
Category
Airplane
Highest injury
None
Fatalities
0
Phase of flight
Landing

Probable cause

The overstress fracture and failure of a main landing gear wheel during landing, resulting in the right wing striking the ground.

NTSB narrative

The pilot was on a personal cross-country flight and had landed at an off-airport site. While taxiing to park, the right wheel broke and the plane tipped on its right wing. The right wing, wing spar, and aileron were damaged when the wing struck the ground. He reported no mechanical problems with the airplane prior to the accident. A postaccident examination of the broken wheel showed the center of the wheel casting adjacent to the inner bearing race had fractured around its circumference, and the casting piece and bearing race had separated from the wheel, allowing the axle to pivot. An examination at the National Transportation Safety Board's materials laboratory revealed features indicative of overstress separation of the flange. No indications of fatigue, corrosion or other preexisting conditions were noted.

Analysis

Primary failure mode
Mechanical failure
First missed decision gate
Pilot could have chosen a different landing area to avoid mechanical failure.

NTSB coding

Evidence available

  • 3 docket documents
View NTSB final reportView NTSB docket

Docket documents3

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