B767 inbound Halifax from Toronto at 33,000 feet was clear to 29,000 feet. Controller acknowledge and cleared him to 10,000 feet. ICN2210
F28 reported at 25,000 feet about 30 nautical miles north of ACA 142, converging into Halifax. The ACA had descended to 25,800 feet and advised he had a TCAS
and was leveling at 26,000feet. ICN also reported a TCAS
and was leveling at 26,000 feet. The controller than turned the ACA142
20 degrees to the left and once he had required radar spacing descended both aircraft into Halifax. TSB Evaluating Update : TSB Case Closed. Update : NAV CANADA conducted an over-the-shoulder ( OTS ) proficiency check on the controller before returning him to duty. Correction: ICN2210
was level at 25,000 feet during the incident and was not leveling off at 25,000 feet.