Incident at Vicinity of Prince Albert, SK (ATS operating irregularity)


1999-02-02: WEW 900, a Cessna 402, was on an IFR flight plan at 7,000 feet from Pelican Narrows to Saskatoon with a transition point over Prince Albert. The Prince Albert estimate was 2329Z. ABS 278, a Beech 1900, was on a proposed IFR flight from Prince Albert via V303 to La Ronge and had requested 16,000 feet. At 2302Z the Prince Albert Data Controller issued the crew of ABS278 a clearance to La Ronge via direct to maintain 4,000 feet and the crew were to track outbound on the YPA 040 degree radial. This track had been determined by the Prince Albert Radar Controller using a Range Bearing Line (RBL) on the scope, however the RBL was incorrect because the Radar Controller had selected the wrong departure point. The tracks of the two aircraft were in fact separated by 17 degrees rather than the required 45 degrees. ABS 278 departed Prince Albert and was subsequently cleared to climb to 16,000 feet and the climb was to be made on the 040 degree radial to 8,000 feet before proceeding direct La Ronge. Radar data analysis revealed that ABS 278 was through 8,000 feet at 2309Z, which was about the time that the control staff became aware that the depicted radial for WEW 900 was incorrect. The error was then reported to the Shift Manager at 2310Z. The Radar Controller determined that WEW 900 was 62 DME northeast of Prince Albert and still in uncontrolled airspace. Based on the speed of WEW 900, this flight would not have entered controlled airspace for another 12 minutes. While there was no loss of separation or risk of collision, the controllers had unintentionally operated for a short period of time with incorrect information represented on the screen. OPI - System Safety


CADORS Number 1999C0065
Occurrence Type Incident
Reported By NAV CANADA
Occurred At 1999-01-26 - 23:05
Day or Night?
Fatalities 0
Aerodrome ID
Aerodrome Name
Geographic Location Saskatchewan, Canada, North America, Prairie and Northern Region, Vicinity of Prince Albert, SK
TSB Occurrence Number
TSB Class of Investigation
AOR Number
Reported By NAV CANADA
Categories ATM/CNS
Events ATS operating irregularity

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