June 5, 1996

Incident at PRINCE ALBERT (GLASS FIELD) SK (CYPA) (ATS operating irregularity)

The pilot of N251JL was cleared La Ronge direct Prince Albert direct Williston, SD to maintain 13000. The flight departed La Ronge at 1553Z and the information was given to the Prince Albert Data Controller who had previously approved the routing and altitude. At 1600Z Prince Albert Data Controller issued a clearance through Prince Albert FSS for ASK700 a BA31 to proceed Prince Albert YPA V303 to La Ronge to maintain 12000 feet. This flight departed PA at 1605Z. At 1607Z Prince Alberta Data requested the passing altitude and DME for N251JL from North Low. North Low advised that N251JL was through 8.7 thousand 33 miles south of La Ronge. On initial contact with the Prince Albert sector radar controller, ASK700 informed him that he was 4.5 DME leaving 5000 for 12000. The radar controller immediately recleared ASK700 to 8000 to ensure vertical separation was maintained. ASK700 was then laddered to higher altitudes with respect to N251JL until both flights were identified by one another. The aircraft passed at 1620Z. The Prince Albert Data Controller was removed from duty, TSB has been advised and a Fact Finding Board is being considered.