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Analysis

Summary

The investigation revealed that each controller had different expectations of the intentions of the other. The DN controller had expected the AN controller's Metro would continue on its current track, and that the two aircraft tracks would cross. Conversely, the AN controller expected to keep his aircraft inside the track of the departing B737. Neither the coordination nor communication between controllers was effective. The unexpected turn onto downwind by the Metro, towards the B737, reduced the distance available for the B737 to climb safely above the Metro. The DN controller attempted to stop the B737 at 6,000 ft, but that instruction, combined with the rate of climb of the aircraft, was unable to prevent a breakdown of the vertical separation standard.

 
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