Incident at SLAVE LAKE AB (CYZH) (Conflict - loss of separation, ATS operating irregularity)


2003-03-04: UPDATE ANS and Airspace reported that Nav Canada will conduct an Operational Safety Investigation (OSI) concerning this occurrence.
2003-02-03: C-GDFK, a Piper Navajo, was inbound to Slave Lake from Calgary and was cleared out of controlled airspace via the Slave Lake NDB DME Runway 28 approach. About 11 minutes later, the pilot of ALZ 712, a Cessna 402, called Edmonton ACC on frequency when on the ground at Slave Lake. The Controller mistook ALZ 712's call as C-GDFK reporting down at Slave Lake. One minute later, ALZ 712 called again and requested clearance to Athabasca. The Controller issued an IFR clearance for ALZ 712 to depart Slave Lake and proceed to Athabasca. A loss of separation occurred when this clearance was issued. One minute later, ALZ 712 advised the Controller that there was still IFR traffic on the approach. To regain separation, the Controller then cancelled the departure clearance for ALZ 712 which was still on the ground at Slave Lake. When the Controller cancelled ALZ 712's departure clearance, C-GDFK was still on the approach in the procedure turn.


CADORS Number 2003C0147
Occurrence Type Incident
Reported By NAV CANADA
Occurred At 2003-02-01 - 00:48
Day or Night?
Fatalities 0
Aerodrome ID CYZH
Aerodrome Name SLAVE LAKE AB (CYZH)
Geographic Location Alberta, Canada, North America, Prairie and Northern Region, Slave Lake
TSB Occurrence Number A03W0019
TSB Class of Investigation Class 5
AOR Number 27341
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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