Incident at CALGARY INTL AB (CYYC) (TCAS alert, Conflict - near collision (VFR or IFR), Conflict - loss of separation, ATS operating irregularity)


2003-03-19: WJA 153, a Boeing 737, had departed Runway 16 at Calgary and was instructed to stop the climb at 8,000 feet because of VFR traffic. DATA 2, a Calgary City Police Cessna 182 was at 9,000 feet (police patrol over the city). WJA 153 levelled at 8,000 then received a TCAS RA so the crew started to climb, advising the Controller of their actions. The Controller stopped the aircraft's ascent because it was right underneath the VFR traffic and heading for it. WJA 153 got to 8,600 feet before starting back down to 8,000 feet.
2003-07-14: UPDATE ANS and Airspace reported that Nav Canada will take no further action on this due to the fact that there was no ATC involvement.
2003-03-24: UPDATE TSB reported that WJA 153, a Westjet Boeing 737-200, registered C-GWWJ, had departed Runway 16 at Calgary with ATC instructions to stop the climb at 8,000 feet asl due to VFR traffic. An Air Data Ltd. Cessna 182 C-GLCT, operating as (DATA 2) was orbitting west of the departure path of Runway 16 at 9,000 feet. When WJA 153 was climbing through 7,500 feet, ATC issued a turn to 320° for traffic avoidance, and while the crew was turning to the new heading, they received a TCAS traffic advisory. Shortly after levelling the aircraft at 8,200 feet, the crew responded to a TCAS resolution advisory climb command, and advised ATC of their actions. ATC instructed WJA 153 to stop the climb because it was approaching DATA 2. By the time the climb was stopped, WJA 153 had reached 8,600 feet, passing about 400 feet below DATA 2, with .7 NM lateral separation. Separation standards between IFR and VFR traffic with visual contact were 500 feet vertical or 1 NM lateral. The pilot of DATA 2 had WJA 153 in sight at all times, and no evasive manoeuvres were required.


CADORS Number 2003C0348
Occurrence Type Incident
Reported By NAV CANADA
Occurred At 2003-03-19 - 00:25
Day or Night? Day-time
Fatalities 0
Injuries 0
Aerodrome ID CYYC
Geographic Location Alberta, Canada, North America, Prairie and Northern Region, Calgary
TSB Occurrence Number A03W0054
TSB Class of Investigation Class 5
AOR Number 28193
Reported By NAV CANADA
Categories Airprox/TCAS alert/loss of separation/(near) midair collisions,ATM/CNS
Events TCAS alert,Conflict - near collision (VFR or IFR),Conflict - loss of separation,ATS operating irregularity

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