Incident at YORKTON MUNI SK (CYQV) (Conflict - loss of separation, ATS operating irregularity)
2005-05-24: UPDATE TSB reported that TGO 985, a DHC-6-300 aircraft, registration C-FCSW was en route Saskatoon to Winnipeg at 9,000 feet. A Piper PA-31-350 aircraft, registration C-GMDL was en route Tisdale to Winnipeg via Dauphin, also at 9,000 feet. TGO 985 required a protected airspace of 10 miles either side of track outside of radar coverage, and C-GMDL required a protected airspace of 45 miles either side of track based on its installed equipment. The aircraft were converging and a procedural loss of separation occurred when C-GMDL entered controlled airspace in the vicinity of Yorkton, Saskatchewan with about 25 NM lateral separation from TGO 985. ATC subsequently recognized the conflict before a risk of collision arose.
2005-05-18: UPDATE ANS & Airspace advised that Nav Canada will conduct a Level 2 OSI into this occurrence.
2005-05-16: TGO 985, a DHC-6 Twin Otter under the control of Great Plains Sector of Winnipeg ACC, was proceeding direct CYXE direct YLR V300 CYWG at 9,000 feet, estimated abeam YQV at 0029Z. Radar service had been terminated by the previous sector (Waskesiu) and the crew instructed to report abeam YQV to Edmonton FIC. At 0011Z Waskesiu Sector passed Great Plains Sector an estimate on C-GMDL, a Piper Navajo, proceeding CJY3 direct YDN direct CYWG at 9,000 feet, estimated YDN at 0043Z. Great Plains Sector requested that the pilot of C-GMDL report abeam YQV to EG FIC. At 0024Z the Great Plains Sector Controller was relieved by another Controller. During the position transfer, the new controller was advised that TGO 985 and C-GMDL were a potential conflict approaching YLR. At 0027Z EG FIC advised Great Plains that C-GMDL was 45 miles north of YQV, 9,000 feet, estimating YDN at 0053Z. At 0030Z EG FIC advised Great Plains sector that TGO 985 had reported abeam YQV at 0029Z, 9,000 feet estimating YLR at 0018Z. Based on the navigational equipment carried by these aircraft and the fact that they were operating in a non-radar environment, TGO 985 required protected airspace 10 miles either side of track and C-GMDL required 45 miles either side of track when in controlled airspace. C-GMDL would have entered controlled airspace at 0025Z as the flight crossed V344/B12 45 miles north of YQV. The confliction was subsequently recognized by the second Great Plains Sector Controller and reported to the supervisor at 0105Z.
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