Incident at GRANDE PRAIRIE AB (CYQU) (Conflict - loss of separation, ATS operating irregularity)


2003-02-18: CNS 100, a Beech King Air, was enroute to Grande Prairie from Helmut, BC and the crew was was cleared from 16,000 feet to 8,000 feet. The crew read back '6,000' feet and ATC accepted this read back. A loss of separation occurred with C-GVZE, a Cessna 414 level at 7,000 feet, when CNS 100 descended below 8,000 feet. The aircraft came within 2.97 miles from each other at the same altitude. The required separation is 1,000 feet and 5 miles.
2003-03-04: UPDATE ANS and Airspace reported that Nav Canada will conduct an Operational Safety Investigation (OSI) concerning this occurrence.
2003-02-19: TSB advised that the Centennial Flight Centre Beech 100, flight CNS 100, was inbound to Grande Prairie, AB from Helmut, BC, descending out of 16,000 feet with clearance to 8,000 feet. The pilot of CNS 100 read back 6,000 and the NavCanada controller accepted this read back as correct. An Alta Flights Cessna 414, registration GVZE, was departing Grande Prairie for Peace River, AB and was levelling off at an assigned altitude of 7,000 feet. A loss of separation occurred when CNS 100 descended below 8,000 feet within 3 miles of C-GVZE, where 5 miles or 1,000 feet of separation is required.


CADORS Number 2003C0224
Occurrence Type Incident
Reported By NAV CANADA
Occurred At 2003-02-13 - 22:43
Day or Night? Day-time
Fatalities 0
Injuries 0
Aerodrome ID CYQU
Geographic Location Alberta, Canada, North America, Prairie and Northern Region, Vicinity of Grande Prairie
TSB Occurrence Number A03W0030
TSB Class of Investigation Class 5
AOR Number 27595
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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