Incident at 70 SE Winnipeg, Manitoba (ATS operating irregularity)


1997-04-14: Heavy thunderstorm activity was occurring in the Winnipeg area causing most aircraft in the vicinity to deviate from their flight planned routes. It became necessary to clear Canadian Airlines flight 989, an Airbus A-320, to flight level 370, as an interim measure, because Canadian Airlines flight 965, a Boeing 767, was proceeding westbound at flight level 350 and converging toward the same opening in the thunderstorm line. The controller could not clear Canadian Airlines flight 989 to flight level 390 until it had passed Northwest Orient flight 70, a Boeing 747, proceeding southeastbound. Air Canada flight 144 also began heading for the same opening. The controller made every effort to vector flights so that a minimum of 5 miles lateral separation would be maintained. However, the pilots of Air Canada flight 144 and Canadian Airlines flight 989 were unable or unwilling to accept the vectors because of the proximity of the build-ups. Traffic information was passed and acknowledged and an altitude change was initiated by Northwest Orient flight 70 so that Canadian Airlines flight 989 could be cleared at flight level 390. At the time Air Canada flight 144 and Canadian Airlines flight 989 passed one another, there was approximately 3 miles lateral and 1300 feet vertical separation. The pilots had visual contact and reported the passing.


CADORS Number 1994C0238
Occurrence Type Incident
Reported By
Occurred At 1994-07-03 - Unknown time
Day or Night?
Fatalities 0
Aerodrome ID
Aerodrome Name
Geographic Location Manitoba, Canada, North America, Prairie and Northern Region, 70 SE Winnipeg, Manitoba
TSB Occurrence Number
TSB Class of Investigation
AOR Number
Reported By
Categories Wind shear or thunderstorm,ATM/CNS
Events ATS operating irregularity

Aircraft Details (1 aircraft)

Type Aeroplane
 Silhouette image of Aeroplane
Canadian Registration
Foreign Registration
Country of Registration
Occurrence Type Incident
Make  Silhouette image of AIRBUS
Model  Silhouette image of A320
Year Built
Engine Type
Engine Make
Engine Model
Gear Type
Private No
Amateur Built No
Flight Number CDN989
Flight Rule
CARS Subpart
Phase of Flight Unknown
Damage Unknown
Fatalities 0
Injuries 0
Events Weather - precipitation

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