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Significant Factors


  1. The Yarowee sector controller was distracted by activity at a neighbouring console before completing the actions required to assign the amended flight level to the crew of the A330.
  2. The Yarowee sector controller cancelled the cleared flight level prompt on the air situation display prior to receiving a correct read back.
  3. The aircraft crews were operating on different frequencies at the time of the potential confliction and were therefore unaware of the situation.

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