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Significant Factors

Summary

  1. Flexing of the tyre sidewalls in operation resulted in fatigue damage in the inner casing plies.
  2. The fatigue damage was possibly present at the last retread process, but was not detected by the non-destructive inspection used in the process.
  3. The fatigue in the plies allowed cracks to develop and grow in the inner liner, allowing high-pressure air to leak into the casing.
  4. Maintenance crews did not detect an increase in the rate of pressure loss in the days leading up to the tyre failure.
  5. The pressure leakage into the casing increased to the point that exceeded the capacity of the in-built venting and, combined with operational loads, resulted in the failure of the tyre structure.
 
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