Primary finding
Probable cause
The total failure of the inboard right main landing gear wheel axle during the initial climb.
Investigator assessment
Analysis narrative
The flight was delayed on the runway after the flight crew exceeded the power nosewheel steering range during a tight 180 degree turn into position. After several unsuccessful attempts to straighten the (castoring) nosewheel using differential power and brakes, the crew called for ground personnel to assist. Ground personnel reported the inboard wheel of the right main landing gear (#3 wheel) appeared to be leaning against the strut. The co-pilot stated the landing gear appeared normal and the flight departed. Shortly after liftoff, the #3 wheel fell to the ground. Postaccident examination revealed the fracture of the axle was the result of the degradation and failure of the #3 inner wheel bearing. There was evidence of water contamination in the wheel bearing grease.
Source record
Factual narrative
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