Incident at EDMONTON INTL AB (CYEG) (Conflict - loss of separation, Alleged Canadian Aviation Regulations (CARs) infraction)

Summary

2005-01-27: UPDATE TSB reported that the Westjet Airlines Boeing 737-200, C-GWJG, was operating as flight WJA 39 from Calgary, AB to Edmonton, AB. When WJA 39 was cleared the STAR for Edmonton, they were given a restriction of 17,000 feet, as there was an Air Canada Jazz Dash 8-100, flight JZA 8138, below them at 16,000 feet. A loss of separation occurred when WJA 39 did not stop their descent at 17,000 feet. Vertical separation was reduced to 600 feet, where 1,000 feet was required, before corrective action was taken by the flight crew. Lateral separation was 3 NM where 5 NM was required.
2005-01-24: WJA 39 and JZA 8138 were en route to Edmonton from Calgary. Both aircraft were flying similar routes and identical STARS, WJA 39 was in the lead. WJA 39 had clearance to descend to 17,000 feet since JZA 8138 was at 16,000 feet. WJA 39 descended below 17,000 feet and the Controller re-cleared the aircraft to maintain 17,000. Vertical separation decreased to 600 feet while the longitudinal (radar) separation was 3 NM (required 5 NM). As soon as WJA 39 was re-cleared to 17,000 feet the aircraft climbed to the assigned altitude and the required separation was re-established.

Details


CADORS Number 2005C0169
Occurrence Type Incident
Reported By NAV CANADA
Occurred At 2005-01-21 - 15:32
Day or Night? Day-time
Fatalities 0
Injuries
Aerodrome ID CYEG
Aerodrome Name EDMONTON INTL AB (CYEG)
Geographic Location Alberta, Canada, North America, Prairie and Northern Region, 35 NM S of Edmonton VOR
TSB Occurrence Number A05W0013
TSB Class of Investigation Class 5
AOR Number 52970-V1
Reported By NAV CANADA
Categories Other,Airprox/TCAS alert/loss of separation/(near) midair collisions
Events Conflict - loss of separation,Alleged Canadian Aviation Regulations (CARs) infraction


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