It was interesting to see the photo on the news tonight. It appears that a massive failure of the wheel hub assembly has occurred, similar to the nose wheel incident not that long ago. Personally from the picture shown on the news, it appears that there was a stress crack around the wheel bearing, or due to corrosion. A crack would have came from the corrosion or from a sharp edge, which there is none on a wheel. It is very common to have wheels cracked, however that is only picked up in the wheel bay when the wheels get NDT (non destructive testing) using dye penetrate.
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