Incident at LUMSDEN (COLHOUN) SK (CKH8) (Conflict - loss of separation, ATS operating irregularity)


2001-09-07: ACA 1189, an A320 en route from Toronto to Calgary, was in turbulence at FL 350 near Lumsden, SK. The crew was advised there were three aircraft at their 12 o'clock, FL 330 and that lower would be available in thirty miles. The Controller also advised that, with a turn, FL 330 would be available sooner. ACA 1189 requested the turn. The Controller turned ACA 1189 right 20 degrees and advised the crew that lower would be available in 5 miles. When the required lateral separation was achieved, ACA 1189 was cleared to desend and maintain FL 310, and when level at FL 310, then direct ALOMO. ACA 1189 left FL 350 for FL 310 and proceeded direct ALOMO. The Controller caught the turn after one radar update and re-established ACA 1189 on the heading. The aircraft passed ACA 3226, a B737 en route from Calgary to Chicago, with 4.94 nautical miles lateral separation and 1,800 feet vertical separation.


CADORS Number 2001C1148
Occurrence Type Incident
Reported By NAV CANADA
Occurred At 2001-09-06 - 23:12
Day or Night? Day-time
Fatalities 0
Aerodrome ID CKH8
Aerodrome Name LUMSDEN (COLHOUN) SK (CKH8)
Geographic Location Saskatchewan, Canada, North America, Prairie and Northern Region, 20 NM E of the Lumsden VOR
TSB Occurrence Number
TSB Class of Investigation
AOR Number 17584
Reported By NAV CANADA
Categories Airprox/TCAS alert/loss of separation/(near) midair collisions,ATM/CNS
Events Conflict - loss of separation,ATS operating irregularity

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