Incident at In the vicinity of: SASKATOON / JOHN G. DIEFENBAKER INTL SK (Conflict - potential, ATS operating irregularity, ATM - NAVAIDS/radar)


2001-05-30: UPDATE ANS and Airspace reported that NAV CANADA will convene a Fact Finding Board.
2001-05-23: UPDATE TSB reported that a loss of separation occurred in the Saskatoon terminal control area involving Air Canada 3831, a Boeing 737 landing Saskatoon, and a departing Canadian Regional Fokker F28. The F28 departed Saskatoon and was cleared through the altitude of ACA 3831. Information on ACA 3831 was not shown on the controller's EXCDS display (extended computer display system - an electronic flight progress strip display) and the Terminal Controller was not aware of its position. Vertical separation between the aircraft was established before lateral spacing had reduced to 15 NM, however, separation had not been assured. A review of the EXCDS system determined that the system parameters removed the aircraft's information from the system after 3 hours, and ACA 3831 had been on the system for more than 3 hours. The EXCDS system parameters were subsequently changed to remove time parameters for aircraft landing in the Saskatoon area.
2001-05-14: CDR 8580, an F28, was departing Saskatoon (YXE) to Winnipeg and was cleared on course climbing to FL 230. The Controller was unaware of ACA 3831, an B737, inbound to YXE from Toronto, as this information was not available on the EXCDS display, and the aircraft had not progressed to where radar handoff would normally take place. This resulted in an unsafe condition, as separation was not assured between the two aircraft. As soon as the Terminal Controller became aware of the inbound ACA 3831, action was taken to assure the safety of the aircraft. CDR 8580 was given radar vectors to have lateral separation. The aircraft achieved vertical separation by the time lateral spacing had reduced to 15 miles. The investigation is ongoing into the EXCDS (Extended Computer Display System) problem. Procedures are being put in place to ensure there is no recurrence of the problem until the hardware/software fix is in place.


CADORS Number 2001C0469
Occurrence Type Incident
Reported By NAV CANADA
Occurred At 2001-05-11 - 03:07
Day or Night? Night-time
Fatalities 0
Aerodrome ID
Aerodrome Name
Geographic Location Saskatchewan, Canada, North America, Prairie and Northern Region, In the vicinity of: SASKATOON / JOHN G. DIEFENBAKER INTL SK
TSB Occurrence Number A01C0087
TSB Class of Investigation Class 5
AOR Number 15209
Reported By NAV CANADA
Categories Airprox/TCAS alert/loss of separation/(near) midair collisions,ATM/CNS
Events Conflict - potential,ATS operating irregularity,ATM - NAVAIDS/radar

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