Incident at CALGARY INTL AB (CYYC) (Conflict - loss of separation, ATS operating irregularity)


2003-05-21: JGO 124, an MD-83, departed from Runway 34 at Calgary for Toronto and was restricted to runway heading due to traffic. N642LF, a Cessna Citation, also departed Runway 34 and was climbing on runway heading before turning to the northwest. JGO 124 was showing 160 knots groundspeed and maintained this airspeed until the flight was turned eastbound about 8 miles north of the airport. N642LF was showing 210 knots groundspeed and before the Controller realized the difference, spacing between the two a/c was reduced to 2 miles lateral and 400 feet vertical. The required standard in this airspace is 3 miles lateral or 1,000 feet vertical.
2003-05-26: UPDATE TSB reported that the Jetsgo MD-83, JGO 124 had departed Runway 34 at Calgary International (CYYC) for Toronto Lester B. Pearson (CYYZ), and was initially restricted to runway heading due to traffic. A Lufkin Industries Inc. Cessna Citation 560, N642LF, departed Runway 34 two minutes behind JGO 124 and also climbed on runway heading before proceeding northwest to Drayton Valley (CER3). Due to aircraft speed restrictions in the vertical noise abatement procedure (VNAP) Alpha departure profile, JGO 124 maintained 160 kts in the climb until 3,000 feet agl, while N642LF maintained 210 kts. N642LF overtook JGO 124 due to the differential speed, and separation between the two aircraft was reduced to 400 feet vertically and 2 miles laterally in an area where the minimum standard is 1,000 feet or 3 miles. The TCAS in N642LF presented JGO 124 as traffic with no TA or RA.
2003-05-29: UPDATE ANS and Airspace reported that Nav Canada has decided not to hold an Operational Safety Investigation.


CADORS Number 2003C0616
Occurrence Type Incident
Reported By NAV CANADA
Occurred At 2003-05-21 - 13:55
Day or Night? Day-time
Fatalities 0
Aerodrome ID CYYC
Geographic Location Alberta, Canada, North America, Prairie and Northern Region, Calgary
TSB Occurrence Number A03W0092
TSB Class of Investigation Class 5
AOR Number 29322
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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