Loss of separation, NAV CANADA – Montréal Area Control Centre, Montréal/Pierre Elliott Trudeau International Airport, Quebec, 18 nm NE, 16 May 2018. : TU3-10/18-0069E-PDF

"On 16 May 2018, an Air Transat Airbus A310-304 aircraft (registration C-GFAT, serial number 545), operating as flight 485 (TSC485), was conducting an instrument flight rules flight from Toronto/Lester B. Pearson International Airport, Ontario, to Montréal/Pierre Elliott Trudeau International Airport, Quebec. At about the same time, a privately owned Cessna 421-B aircraft (registration C-GADG, serial number 421B0802) conducting an instrument flight rules flight, was returning to Montréal/Pierre Elliott Trudeau International Airport from Trois-Rivières Airport, Quebec. The Airbus was inbound from the west, and its flight path would take it north of the airport to commence an approach to land on Runway 24R. The Cessna was inbound from the northeast to commence an approach to land on Runway 24L. At 1901:17 Eastern Daylight Time, when the aircraft were approximately 18 nautical miles northeast of Montréal/Pierre Elliott Trudeau International Airport, a loss of separation occurred. Neither the required vertical separation minimum of 1000 feet nor the lateral separation minimum of 3 nautical miles was maintained. When the loss of separation occurred, they were 200 feet and 2.8 nautical miles from each other. At the closest point, the 2 aircraft came within 500 feet vertically and 1.7 nautical miles laterally of each other. At 1902:22, following instructions from the controllers, the required separation was re-established, and the 2 aircraft landed without incident"--Summary, page 1.

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