Incident at 55 NM E of Saskatoon, SK (ATS operating irregularity)


1999-05-18: ACA 108, an A319 with 99 people on board, departed Saskatoon for Toronto and the crew was given a north-of-course climb to FL 330. At the same time, Viking 6, a CT-114 Tutor, was on an IFR flight from Moose Jaw to Prince Albert at FL 220. The tracks of the two a/c would cross at 90 degrees, 55 NM east of Saskatoon. The Saskatoon Terminal Controller co-ordinated with the Prince Albert Sector Controller that Air Canada 108 would stay north of track and climb to FL 330 to accommodate westbound traffic. About two minutes later, the Prince Albert Controller, who was working both data and radar positions for the sector, received an estimate for Viking 6 from the Great Plains Sector Controller. He then received three estimates for other a/c, which required strip revision. The Sector Supervisor, who was returning from break, noticed the increased activity in the Prince Albert Sector and offered to help the Sector Controller. About two minutes later, the Supervisor recognized a potential conflict between ACA 108 and Viking 6, which were on converging tracks. He advised the Sector Controller, who activated Projected Track Lines (PTL) to confirm, and then issued a climb restriction to the crew of ACA 108. The a/c were 38.9 NM apart when lateral separation was assured. The Prince Albert Sector Controller was relieved from duty pending a preliminary investigation by NavCanada. The Shift Manager plans to review the Sector Controller's task prioritisation before his reinstatement. OPI - ANS and Airspace UPDATE ANS reported that NavCanada will conduct a Fact Finding Board concerning this occurrence.


CADORS Number 1999C0334
Occurrence Type Incident
Reported By NAV CANADA
Occurred At 1999-05-03 - 17:08
Day or Night?
Fatalities 0
Aerodrome ID
Aerodrome Name
Geographic Location Saskatchewan, Canada, North America, Prairie and Northern Region, 55 NM E of Saskatoon, SK
TSB Occurrence Number
TSB Class of Investigation
AOR Number
Reported By NAV CANADA
Categories ATM/CNS
Events ATS operating irregularity

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