Incident at Calgary, AB (Conflict - loss of separation, ATS operating irregularity)


1999-05-03: CDR 1371, an F28, departed Calgary for Edmonton and was on a heading of 350 degrees to intercept J537 and climbing to FL 220. WJA 35, a B737, was inbound to Calgary from Edmonton and descending on the Toron Arrival. It was anticipated that vertical separation would be achieved before lateral spacing ran out. It appeared that when 3 miles lateral separation existed (the minimum requirement in this sector), the a/c were at the same altitude. At 2.5 miles separation, there was 300 feet vertical and increasing, and at 2 miles there was 700 feet. At 1.4 miles, there was 1,100 feet and increasing. Traffic had been passed but no evasive action was taken by the two crews and they apparently saw each other's a/c. OPI - ANS and Airspace


CADORS Number 1999C0317
Occurrence Type Incident
Reported By NAV CANADA
Occurred At 1999-04-30 - 23:39
Day or Night?
Fatalities 0
Aerodrome ID
Aerodrome Name
Geographic Location Alberta, Canada, North America, Prairie and Northern Region, Calgary, AB
TSB Occurrence Number
TSB Class of Investigation
AOR Number
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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