Incident at TORONTO / LESTER B. PEARSON INTL ON (CYYZ) (ATS operating irregularity)
1997-10-28: The approach at LBPIA was being moved from runway 24L and 24R to runway 06L and 06R. ACA159 was vectored for a right hand downwind for 06R at the same time ACA918 departed 24R. The departure was cleared to 4,000' ASL and the arrival was to be restricted to 5,000' ASL until the tracks diverged. The arrival controller in error cleared the arrival to 4,000' ASL. Ops. Impact -- unknown.
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