Incident
at KERPU intersection
A Brampton Flying Club Cessna 172R (C-GNUE) from Brampton-Caledon, ON (CNC3) to Toronto/Oshawa, ON (CYOO) departed from CNC3 and requested flight following to CYOO via the city centre. C-GNUE was not visible to the controller and was assigned a code, which was read back. C-GNUE appeared as a "chicken foot" as it entered Class C airspace. The transponder for C-GNUE finally appeared as the aircraft was crossing through the localizer for Runway 05, with an Icelandair Boeing 737 MAX 8 (ICE37B) from Reykjavik/Keflavik, Iceland (BIKF) to Toronto/Lester B. Pearson, ON (CYYZ) on final. The controller passed traffic to C-GNUE and instructed them to descend. The tower passed VFR traffic to ICE37B. The tower passed traffic to an Air Canada Rouge Airbus A321-211 (ROU1657) from Tampa, FL (KTPA) to Toronto/Lester B. Pearson, ON (CYYZ) and C-GNUE continued southbound and crossed the localizer for 06L, with ROU1657 on final. No other operational impact.
UPDATE: TSB Report #A22O0004: C-GNUE, a Cessna 172R aircraft owned by Brampton Flying Club, was on a rental round-trip visual flight rules (VFR) flight from Brampton-Caledon, ON (CNC3), with a stop at the Oshawa, ON (CYOO) airport via the Toronto City Center, with one pilot and one passenger onboard. At 2301, the Toronto Terminal provided the occurrence pilot with a transponder code, and the pilot readback the correct code. The aircraft then entered Toronto Pearson International, ON (CYYZ) Class C controlled airspace without Air Traffic Control (ATC) clearance. At that point, the transponder code was not appearing on the ATC radar. The aircraft continued, crossing eastbound through the localizer of Runway 05 at CYYZ, where it appeared on ATC radar. The aircraft flew in front of flight ICE37B, a Boeing 737 MAX 8 aircraft on final approach for Runway 05, resulting in a minimum separation of 300 feet vertical and 1 nm lateral. Subsequently, the aircraft crossed the localizer for Runway 06L at CYYZ in front of flight ROU1657, an Airbus A321 aircraft on final approach, resulting in a minimum separation of 900 feet vertical and 0.3 nm lateral. After crossing the localizer for Runway 06L, the occurrence pilot exited the CYYZ control zone under the direction of the Toronto Terminal, and the flight continued without further incident.