Pre-Departure Events
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. Attempts to straighten the castering nosewheel using differential power and brakes were unsuccessful, prompting the crew to call for ground personnel to assist.
Ground Personnel Observations
Upon arrival, ground personnel reported that the inboard wheel of the right main landing gear (the #3 wheel) appeared to be leaning against the strut. However, the co-pilot stated that the landing gear appeared normal, and the flight subsequently departed.
Inflight Incident
Shortly after liftoff, the #3 wheel fell to the ground.
Post-Accident Examination
Examination revealed that 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.