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Significant Factors

Summary

  1. A conditional clearance authorising the surface movement controller to clear CZH to cross runway 34 was issued to the surface movement controller by the aerodrome controller.
  2. The aerodrome controller's training officer was not aware that a conditional clearance was active when he instructed the aerodrome controller to clear EAL for take off.
  3. There was no tactile memory marker alerting the controllers that an aircraft had been cleared to cross an active runway.
  4. The aerodrome controller did not scan runway 34 before issuing the take-off clearance.
  5. Neither the aerodrome controller nor the training officer cancelled EAL's take-off clearance when they became aware that CZH was crossing runway 34.
 
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