DH8D / DH8D, vicinity Sudbury ON Canada, 2016

DH8D / DH8D, vicinity Sudbury ON Canada, 2016

Summary

On 14 October 2016, two Bombardier DHC8-400s received coordinated TCAS RAs as they came into opposite direction conflict near Sudbury, an uncontrolled airport, as one was descending inbound and emerging from an overcast layer and the other was level just below that layer after departing. Both aircraft crews ignored their RAs and their respective visual manoeuvring brought them to within 0.4nm at the same altitude. The Investigation noted that the conflict had occurred in Class  E airspace after the departing aircraft had cancelled IFR to avoid a departure delay attributable to the inbound IFR aircraft.

Description

On 14 October 2016, a Bombardier DHC8-400 (C-GXJZ) being operated by Jazz Aviation on an Air Canada Express scheduled passenger flight from Sudbury to Toronto as JZA 604 and on an VFR clearance climbing out after takeoff from runway 22 and another Bombardier DHC8-400 (C-GKQA) being operated by Porter Airlines on a scheduled passenger flight from Toronto City to Sudbury as POE 533 and descending IFR but cleared for a visual approach to runway 04 received TCAS RAs in daylight due to their close proximity but still passed very close to each other to the southwest of the airport.

Investigation

An Investigation was carried out by the Canadian Transportation Safety Board (TSB). FDR data was used to support the Investigation. Since ATC were unaware of the severity of the conflict, the TSB was not immediately informed of it and both CVRs were overwritten.

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