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ASN Wikibase Occurrence # 220871
Last updated: 19 May 2020
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Date:03-JAN-2019
Time:10:21 LT
Type:Silhouette image of generic DH8D model; specific model in this crash may look slightly different
de Havilland Canada DHC-8-402Q Dash 8
Owner/operator:WestJet Encore
Registration: C-FSWE
C/n / msn: 4517
Fatalities:Fatalities: 0 / Occupants: 50
Other fatalities:0
Aircraft damage: None
Category:Incident
Location:20 nm W of Kelowna, BC -   Canada
Phase: En route
Nature:Domestic Scheduled Passenger
Departure airport:Calgary International Airport, AB (YYC/CYYC)
Destination airport:Nanaimo Airport, BC (YCD/CYCD)
Investigating agency: TSB Canada
Narrative:
A Bombardier DHC-8-400 aircraft operated by WestJet Encore (C-FSWE), was conducting flight WEN3109 from Calgary (CYYC), Canada to Nanaimo (CYCD). At the same time a Piaggio P.180 aircraft operated by Rainbow Sandals Retail Inc (N990RS), was conducting a flight from Spokane (KGEG), USA to Kamloops (CYKA), Canada.
At 10:21:11 Pacific Standard Time, when the aircraft were west of Kelowna, a loss of separation occurred when the required vertical separation minimum of 1000 feet or lateral separation minimum of 5 nautical miles was not maintained. At that time, the aircraft were at the same altitude and less than 5 nautical miles from each other on converging tracks.
At 10:21:20, the Q400 flight crew received and responded to a traffic alert and collision avoidance system resolution advisory to descend. At approximately the same time, the Piaggio P.180 received a traffic advisory. At 10:21:49, there was 1000 feet of vertical separation and 0.9 nautical miles of lateral separation between the two aircraft. Both flights continued to their destinations without further incident.

Findings as to risk:
- If controllers are unfamiliar with air traffic services equipment errors, they may focus their attention on error resolution to the detriment of monitoring and controlling the movement of aircraft, increasing the risk of air traffic conflicts.
- If team supervisors do not adequately monitor controller workload in complex situations with high traffic levels, workload may exceed controller limits, increasing the risk of adverse consequences, such as a loss of separation.

Sources:

TBS A19P0002

Accident investigation:
cover
  
Investigating agency: TSB Canada
Status: Investigation completed
Duration: 1 year and 3 months
Download report: Final report


Images:


Flight tracks of N990RS and WEN3109, based on Flightaware ADS-B data.

Revision history:

Date/timeContributorUpdates
16-Jan-2019 20:41 harro Added
16-Jan-2019 21:02 harro Updated [Narrative]
02-Apr-2020 19:37 harro Updated [Time, Narrative, Accident report, ]

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