An Orizon Aviation Quebec Inc. Cessna 152 (C-GQVQ) from Quebec/Jean Lesage, QC (CYQB) to Toronto/Billy Bishop, ON (CYTZ) entered Taxiway A and held short of Runway 09 at Ottawa/Gatineau, QC (CYND) prior to contacting the air traffic service (ATS) unit. No impact on operations.

A privately registered, amateur-built Vans RV-6A on a flight from Ottawa/Gatineau, QC (CYND) entered Taxiway A and held short of Runway 09 prior to contacting the air traffic service (ATS) unit. No impact on operations.

A Parachutisme Adrénaline Inc. Cessna 208B (C-GOXL/ADRNL9) from Ottawa/Gatineau, QC (CYND) to Ottawa/Gatineau, QC (CYND) entered Taxiway A and held short of Runway 09 prior to contacting the air traffic services (ATS) unit. No impact on operations.

A Skyquest Aviation Ltd. Piper PA-34-200 (C-GTYH) from Langley, BC (CYNJ) to Abbotsford, BC (CYXX) encountered a flat tire landing on Runway 07. Runway 07/25 was closed for 1.25 hours. One departure, a Swoop Inc. Boeing 737-8CT (WSW208) from Abbotsford, BC (CYXX) to Edmonton, AB (CYEG), was delayed by 50 minutes. A Flair Airlines Boeing 737-86N (C-FFLA/FLE151) from Toronto/Lester B. Pearson, ON (CYYZ) to Abbotsford, BC (CYXX) held for 10 minutes before diverting to Vancouver, BC (CYVR). One VFR training flight was denied circuits. The runway re-opened at 0444Z.

After landing on Runway 23, a Flexjet Embraer EM-545 (LXJ408) from Chicago/Midway, IL (KMDW) to Toronto/Lester B. Pearson, ON (CYYZ) was cleared southbound on Taxiway Echo, with an instruction to hold short of Sierra, which was read back. Taxiing for departure, an Air Canada Rouge Airbus A319 (ROU1644) from Toronto/Lester B. Pearson, ON (CYYZ) to Miami, FL (KMIA) was cleared to Runway 05 via Taxiway Tango, with instructions to cross Runway 33R, turn right on Taxiway E, and hold short of Sierra. Both aircraft wound up in the opposite direction on Echo. ROU1644 held short of EA and allowed LXJ408 to enter the ramp. No other operational impact.

A privately registered Colonial C-2X from Haliburton/Stanhope, ON (CND4) to Toronto/Billy Bishop, ON (CYTZ), upon arrival, experienced a partial gear collapse while exiting Runway 26 onto Taxiway Foxtrot. The aircraft was disabled. Several airliners held while waiting for the runway to re-open.

The pilot of a privately registered Fleet 80 from St. Catharines/Niagara, ON (CYSN) to St. Catharines/Niagara, ON (CYSN) heard an emergency locator transmitter (ELT) while setting up their plane in the vicinity of Fort Erie, ON (Heli) (CPG3). They turned their own ELT off and the sound was still audible. CYSN confirmed a faint reception on hand-held radio (NICAN) with squelch off. Toronto area control centre (ZYZ) Shift Manager advised. Unknown operational impact.

At Sioux Lookout, ON (CYXL), while the receiver (RX) on 121.5 MHz was unserviceable (U/S), the hand-held radio (NICAN) had been used to monitor the frequency. It was discovered to be off at 0050Z, thus 121.5 MHz was unmonitored. No known impact to operations.

Upon exiting Pad 6, an Air Transat Airbus A321-271NX (TSC186) from Toronto/Lester B. Pearson, ON (CYYZ) to Punta Cana, Dominican Republic (MDPC) was instructed by the de-ice bay to hold short of Taxiway V. TSC186 continued to taxi on Taxiway V and held short of Taxiway F instead. No other operational impact.

Aviation Incident Report: A Kenn Borek Air de Havilland DHC-6-300 (C-FDHB) from Liberia, Costa Rica (MRLB) to Houston, TX (KHOU) landed on Runway 4 and taxied to Taxiway R. After the aircraft was clear of the runway and switching to ground control, the aircrafts brakes and left tire caught on fire. There was a small amount of smoke coming from the aircraft, but no visible flames. The fire station was alerted and rolled the trucks, however, before the trucks arrived, the pilot put out the fire using an on-board fire extinguisher. The aircraft was towed to the fixed-base operator (FBO). No damage to airport property. No injuries. Extent of damage unknown.
UPDATE: TSB Report #A22F0022: C-FDHB, a Kenn Borek Air Viking DHC-6-200 was conducting a flight from Liberia/Daniel Oduber Quirós Intl, Costa Rica (MRLB) to Houston/William P. Hobby, TX (KHOU). After landing in KHOU, the pilot applied brakes to exit via the taxiway and felt that the airplane grabbed a bit more then usual on the left-hand side. After exiting the runway, the flight engineer on board called Fire on the left-hand side of the airplane. The pilot stopped the airplane and shut down the engines. The flight engineer jumped out and extinguished the fire on the left-hand main landing gear with a hand held onboard fire extinguisher. After inspection, it was discovered that the left-hand brake caliper had broken free from its mount and rotated forward, severing the hydraulic lines.

The Thompson (YTH) flight service station (FSS) reported that a Perimeter Aviation flight (PAG773) requested to have their VFR flight plan closed. The Edmonton (EG) flight information centre (FIC) advised that no VFR flight plan was on file. The Data Systems Coordinator (DSC) was advised. The Air Traffic Operations Specialist (ATOS) held IFR alerting.

A Transwest Air Beech 1900D (C-GURF) from Saskatoon/John G. Diefenbaker, SK (CYXE) to Prince Albert/Glass Field, SK (CYPA), on approach, received a "Flap Failure" indication at 1532Z. Assistance was offered and declined. The aircraft held West of the control zone. At 1540Z, the aircraft elected to return to CYXE. No impact to operations.

An Eon Aéroporté Inc. Piper PA-31 (C-GPTB) from Fort McMurray, AB (CYMM) to Fort McMurray, AB (CYMM) had a flat tire on arrival and stopped on the runway. A McMurray Aviation Cessna 208B (C-GWKO) from Fort McMurray, AB (CYMM) to Fort McMurray, AB (CYMM) was on final and was instructed to conduct a go-around. The aircraft held for 40 minutes. A McMurray Aviation Cessna 208B (C-GWRK) from Fort Chipewyan, AB (CYPY) to Fort McMurray, AB (CYMM) was inbound and also held for 32 minutes. The area control centre (ACC) shift manager was advised. C-GPTB was successfully removed from the runway at 1917Z. No further impact to operations.

An Exact Air Piper PA-31 (C-FVYW/ET870) from Fort McMurray, AB (CYMM) to Fort McMurray, AB (CYMM) landed on Runway 26 at 2135Z and reported a flat nose gear tire, and advised they would require a tow off the runway. The aircraft was removed from the runway at 2213Z. A WestJet Encore de Havilland DHC-8-402 (WEN3245) from Edmonton, AB (CYEG) to Fort McMurray, AB (CYMM) held from 2144Z to 2214Z, and landed at 2221Z.

After receiving a poor braking action report from a previous arrival with a crosswind during a weather event, the pilot of a WestJet Boeing 737-8CT (C-FWJS/WJA170) from Vancouver, BC (CYVR) to Edmonton, AB (CYEG) elected not to continue the approach. WJA170 held until 0038Z and then diverted to Calgary, AB (CYYC). No other impact on operations.

A Summit Air Aerospatiale ATR 72-202 (C-GUSA/SUT7211) from Yellowknife, NT (CYZF) to Norman Wells, NT (CYVQ) reported on initial climb that they had a de-icing issue and were returning to CYZF. They held for approximately 20 minutes to burn fuel and landed safely. No assistance required, no impact to operations.

A Thompson Aviation Pilatus PC-12/47 (C-GTAI) from Edmonton/Villeneuve, AB (CZVL) to Fort McMurray, AB (CYMM) was unable to exit the runway due to frozen brakes. Once de-ice fluid was applied, the aircraft was able to exit. A WestJet Encore de Havilland DHC-8-402 (WEN3147) from Calgary, AB (CYYC) to Fort McMurray, AB (CYMM) held for 30 minutes in order for the aircraft to exit.
UPDATE: Aviation Incident Report #17477: A Thompson Aviation Pilatus PC-12/47 (C-GTAI) on a flight to Fort McMurray, AB (CYMM) landed with the right-hand wheel brake frozen. The aircraft was disabled on the runway for approximately 40 minutes, and required assistance to free the wheel brake before taxiing off the runway.

A WestJet Boeing 737-8CT (C-FUJR/WJA228) from Calgary, AB (CYYC) to Halifax/Stanfield, NS (CYHZ) broke off its approach when 7NM final due to the previous arrival reporting poor braking conditions. WJA228 held for 10-15 minutes and then diverted to Toronto/Lester B. Pearson, ON (CYYZ). Airport duty manager advised. No impact on operations.

Aviation Incident Report #17367: At 2054Z, an Air Inuit Boeing 737-275C (C-GOPW/AIE781) from La Grande Rivière, QC, (CYGL) to Puvirnituq, QC (CYPX) called to Puvirnituq universal communications (UNICOM) saying that they had trouble retracting the flaps. The aircraft held by the north side of the airport working on their issue. At 2106Z, AIE781 declared an emergency and requested emergency services on standby. All emergency services on standby at 2124Z. AIE781 landed Runway 19 at 2135Z. AIE781 requested that fire fighters be on standby due to possible hot brakes.
UPDATE: TSB Report #A21Q0098: C-GOPW, an Air Inuit Boeing 737-275C operating as flight AIE781, was on an instrument flight rules flight from La Grande Rivière, QC (CYGL) to Puvirnituq, QC (CYPX) with 3 crew members on board. When the flaps were set to "FLAP 1" position on initial approach to CYPX, an asymmetry message appeared and the flaps stopped moving. The crew conducted a missed approach, then completed the Quick Reference Handbook (QRH) checklist to land with the wing leading edge devices out and the trailing edge flaps retracted. The crew declared an emergency and landed the aircraft on Runway 19 without incident. There were no injuries or damages.

A WestJet Boeing 787-9 (WJA4) from London/Gatwick, England (EGKK) to Toronto/Lester B. Pearson, ON (CYYZ) advised air traffic control (ATC) of an unruly passenger onboard around 1815Z. The pilot advised no assistance was required but later declared an emergency at 1828Z when given a flow time into CYYZ. The aircraft landed without incident at 1904Z.
UPDATE: Duplicate AOR 280847-V1: A WestJet Boeing 787-9 (C-GMKS/WJA4) from London/Gatwick, UK (EGKK) to Toronto/Lester B. Pearson, ON (CYYZ) reported a disruptive passenger on board. The aircraft did not declare an emergency or request assistance. No impact on operations. (Duplicate AOR 280847-V1/CADORS 2021Q3496 deleted after information merge.)
UPDATE: Aviation Incident Report #17449: The crew of a WestJet Boeing 787-9 (C-GMKS/WJA4) from London/Gatwick, UK (EGKK) to Toronto/Lester B. Pearson, ON (CYYZ) advised Operations that a passenger had become both physically and verbally abusive to the in-flight crew, and a red card for non-mask compliance had been issued. The crew declared an emergency and landed safely at CYYZ at 1914Z. The passenger was restrained and Peel Police met the aircraft on arrival where they requested backup to deal with the passenger. De-boarding was held until the passenger was escorted away by police. The crew completed a debrief.

TSB Report #A21Q0066: A Parachutisme Adrénaline Inc. Cessna P206A (C-FMHQ) was on a parachute flight from the Trois-Rivières, QC (CYRQ) airport. On the landing roll, directional control of the aircraft was lost and the aircraft ended its course on the grassy part of the runway. The aircraft’s propeller was damaged; the pilot, the only occupant on board, was not injured.
Aviation Incident Report #17224: When landing on Runway 23 at Trois-Rivières, QC (CYRQ) after a parachute drop, a Parachutisme Adrénaline Cessna P206A (C-FMHQ) from Trois-Rivières, QC (CYRQ) to Trois-Rivières, QC (CYRQ) made a runway excursion into the grass south of Runway 23, at about the height of Taxiway A. The pilot reported that when the nose wheel touched down after the main landing gear in the centre of the runway, the aircraft began to veer slightly to the left. The pilot unsuccessfully attempted to correct it by throttling right. With increased movement to the left, additional right throttle pressure was applied until full deflection, again unsuccessfully. The pilot then applied the right brake to attempt to correct the aircrafts trajectory, which did not seem to respond to the rudder pressure. Now sliding to the left and seeing only trees and a fence in front, conducting a go-around was no longer an option for the pilot. At this point, both brakes were applied to slow the aircraft down as much as possible before exiting the runway. The aircraft ended its course with its nose in the grassy part. The engine continued operating and running normally. Since no damage was apparent, the pilot taxied on the ground without assistance up to Planet-Air Maintenance. The aircraft appeared to respond properly to the brake/rudder commands while taxiing on the ground following its exit from the runway. The aircraft was sent to an approved maintenance organization (OMA) that will inspect and try to determine if a mechanical failure might have been the cause. An inspection will take place following the event. On the flight operations side, since the exact reason for the incident was not known at the time of the report, a discussion was held regarding best flight practices.

A privately registered Cessna A185F requested clearance from the tower for a take-off from the river of the Prairies. The aircraft crashed into the river. There was significant damage to the aircraft. No injuries or deaths.
UPDATE: TSB Report #A21Q0051: A privately registered Cessna 185 on floats that was tied to a private dock on Rivière des Prairies, approximately 4 NM north-west of Montréal/Pierre-Elliott-Trudeau, QC (CYUL), was getting ready to perform a local visual flight rules flight. While the aircraft taxied on water, the pilot followed the checklist in preparation for takeoff. The checklist did not indicate to check for removal of the control surface locking device and the aircraft was not equipped with an approved device. However, an unapproved device had been installed the previous day and had not been removed during preparation for takeoff. The aircraft began its takeoff on the water when the pilot noticed that the flight controls were blocked. The aircraft was able to rise above water but was not able to rise any further. The aircraft descended back down and nosed over forward just as the floats touched the water’s surface, and then flipped over. The pilot was held in the seat by a 4-point seatbelt and was wearing a PFD. The pilot was able to quickly evacuate the aircraft and was not injured. A boat came to rescue the pilot, who was brought to shore.

An Air Inuit de Havilland DHC-8-102 (C-FDLG/AIE858) from Kangirsuk, QC (CYAS) to Kuujjuaq, QC (CYVP) advised that it would conduct a missed approach due to a landing gear issue. The aircraft declared an emergency at 0102Z and landed on Runway 25 at 0126Z, without incident. No impact on operations.
UPDATE: TSB Report #A21Q0001: C-FDLG, a de Havilland DHC-8-102 operated by Air Inuit, was on flight AIE858 under instrument flight rules from Kangirsuk, QC(CYAS) to Kuujjuaq, QC (CYVP) with 3 crew members and 7 passengers on board. While the aircraft was on approach for landing at CYVP, the "Gear Unsafe" light for the nose wheel illuminated when the landing gear was selected in the extended position. The crew ascended and an emergency was declared with the Kuujjuaq Flight Service Station (FSS). Once established in a holding pattern, the Quick Reference Manual (QRH) checklist was completed and the landing gear was successfully deployed. The aircraft touched down on Runway 25 without issue.
UPDATE: Aviation Incident Report #16949: The Kuujjuaq, QC (CYVP) Emergency Response Plan was activated by the NAV CANADA Kuujjuaq flight service station (FSS) when the crew of an Air Inuit de Havilland DHC-8-102 (C-FDLG/AIE858) from Kangiqsualujjuaq (Georges River), QC (CYLU) to Kuujjuaq, QC (CYVP) notified the FSS of a landing gear issue. The Kativik Regional Government (KRG) Transportation unit, NAV CANADA, the FSS, the fire department, the Kativik Regional Police Force (KRPF), the health centre (i.e. ambulance), and Air Inuit responded to the emergency. The aircraft landed safely and taxied to the apron on its own power. There were no injuries. A debriefing session was held on January 14, 2021.

Vehicle frequency 122.6 MHz failed. The hand-held radio (NICAN) was used instead. No impact to operations.

An unauthorized pedestrian was seen on Taxiway A, the main apron and the infield. The Royal Canadian Mounted Police (RCMP) unit responded. A Jazz de Havilland DHC-8-402 (C-GJZR/JZA2262) from Vancouver, BC (CYVR) to Nanaimo, BC (CYCD), on the approach, was held for 5 to 10 minutes.

As requested by the pilot upon initial contact with the Vancouver (VR) tower, an American, corporately registered Cessna 510 (N62WM) on a flight from Vancouver, BC (CYVR) was cleared to the Bellingham, WA (KBLI) airport. However, the flight plan was not amended and showed a route and destination for Seattle/Boeing Field, WA (KBFI). The discrepancy between the pilots clearance and the flight plan held in the Canadian Automated Air Traffic System (CAATS) was not detected until after the aircraft was airborne. No operational impact.

The Flight Service Station (FSS) observed an aircraft on Taxiway Alpha taking position on Runway 12 at Fort St. John, BC (CYXJ). The aircraft did not initiate contact with the FSS on 118.5 MHz and did not respond to calls from the FSS. The unknown aircraft departed from Runway 12 and turned northwest (NW) bound. The specialist used the hand-held radio (NICAN) to broadcast on 126.7 MHz, and confirmed that the aircraft was an American, privately registered and amateur-built Sportsman GS-2 from Fort St. John, BC (CYXJ) to Watson Lake, YT (CYQH). The pilot was advised to contact the Edmonton (YEG) Flight Information Centre (FIC) when able.

A privately registered, amateur-built aircraft from Nanaimo, BC (CYCD) to Nanaimo, BC (CYCD) landed at 1819Z, at the same time that a WestJet Encore Ltd. Bombardier DHC-8-402 (C-GTWE/WEN3228) from Nanaimo, BC (CYCD) to Calgary, AB (CYYC) was conducting a pushback and start-up on the main apron. The privately registered, amateur-built aircraft advised that it would pass WEN3228 on the right side. The Flight Service Station (FSS) advised WEN3228 of the privately registered, amateur-built aircrafts intentions. The privately registered, amateur-built aircraft directly questioned WEN3228, asking if it was ready to taxi. WEN3228 replied "Standby". The privately registered, amateur-built aircraft stopped taxiing and held position, in close proximity to WEN3228, and appeared to be behind the right wing and abeam to the tail, adjacent to construction barriers.

A North Cariboo Flying Service Beech B200 (C-GNCU/NCB580) from Prince George, BC (CYXS) to Tsay Keh, BC (CBN9) reported pressurization issues 45NM southeast (SE) of CBN9, and requested to return to CYXS. No impact to operations.
UPDATE from Airworthiness: A Civil Aviation Safety Inspector (CASI) looked into this occurrence. While en route in cruise, the crew heard a faint noise toward the back of the aircraft, just prior to descent. During descent, the noise became louder. The crew informed air traffic control (ATC) and requested to return back to Prince George, BC (CYXS). The crew noted that the cabin altitude was indicating 8000 ft while the controller was indicating 6000 ft. The aircraft remained pressurized during all phases of flight and, other than the noise in the back of the cabin, the cabin differential needle held constant in cruise and decreased normally in descent. Once the aircraft arrived in CYXS, the aircraft was inspected and a hole was discovered in the cabin door seal. The door seal was replaced and the aircraft was returned to service. No further action.

A Jazz Bombardier CL-600-2D24 (C-FIJZ/JZA8515) from Kelowna, BC (CYLW) to Vancouver, BC (CYVR) was instructed to taxi out via Delta and hold short Alpha, then contact The Tower. JZA8515 taxied into Alpha and held short Runway 16. No operational impact.

At Tofino/Long Beach, BC (CYAZ), a deer was reported in the runway protected area (RPA) of Runway 16/34 by a Pacific Coastal Airlines Limited Beech 1900D (C-GSWV/PCO1610) from Tofino/Long Beach, BC (CYAZ) to Vancouver, BC (CYVR) that was taxiing for departure from Runway 16. The aircraft held in position on Runway 16 while airport maintenance scared the deer off.

A Langley Flying School Inc. Piper PA-28-140 (C-GUKG) from Langley, BC (CYNJ) to Langley, BC (CYNJ) was inbound for a full stop, and had difficulty landing. Multiple landing attempts were made before the aircraft landed safely at 0023Z. The aircraft held outside the zone and on the ground. Moderate impact to operations.

A Seair Seaplanes Ltd. Cessna 208 (C-GIGO), while being pushed from the dock, started its engines. The deckhand lost control while holding the rope, resulting in contact with a Harbour Air Ltd. de Havilland DHC-3 (C-GUTW), which was docked adjacent. Significant damage to both aircraft.
UPDATE: TSB Report #A21P0058: C-GIGO, a float equipped Cessna 208 aircraft operated by Seair Seaplanes Ltd., was preparing to conduct a flight from Ganges Harbour, BC (CAX6) to Vancouver, BC (CYVR) with 1 crew member on board. Prior to the engine starting, the dockhand assisting the pilot untied the guide rope and held it in their hand. When the engine started, the aircraft travelled forward, pulling the rope from the dockhand. The aircraft began travelling forward until the propeller of C-GIGO struck the rear of C-GUTW, a float equipped DHC-3T operated by Harbour Air. After the initial prop strike, the pilot of C-GIGO quickly shut down the engine, as the aircraft rotated 90 degrees, striking C-GUTW with the right-hand (RH) wing. C-GUTW was tied to the dock with no one on board during the occurrence. There were no injuries; both aircraft sustained substantial damage.

A Skyquest Aviation Cessna 152 (C-GTYB) from Langley, BC (CYNJ) to Langley, BC (CYNJ) called inbound near Fort Langley. C-GTYB was given a straight-in approach for Runway 19. The aircraft was observed 1NM to 1.5NM East of the approach and looked lost. The aircraft was given multiple ways to find the airport before landing safely 15 minutes later. Two aircraft, a privately registered, amateur-built Europa Classic from Langley, BC (CYNJ) to Langley, BC (CYNJ) and a privately registered Cessna 172K from Langley, BC (CYNJ) to Langley, BC (CYNJ) were held outside of the zone, and one additional departing aircraft was vectored out of the way.

A KF Cargo Convair 580 (KFA578) from Kamloops, BC (CYKA) to Vancouver, BC (CYVR) advised that it was receiving an emergency locator transmitter (ELT) signal about 5-7NM North of CYKA. The hand-held radio (NICAN) transmission (TX), tuned to 121.5 MHz, was receiving a strong ELT signal that appeared to be at the aerodrome. ELT signal transmission ended at approximately 0016Z. Shift manager advised.

A Carson Air Ltd. Beech 1900D (C-FBTR/CRN511) on a MEDEVAC flight from Kelowna, BC (CYLW) to Fort St. John, BC (CYXJ) was instructed to taxi via Taxiway Delta and hold short of Taxiway Alpha. The aircraft taxied via Taxiway Delta and Alpha, then held short of Runway 16. No operational impact.

A Carson Air Ltd. Beech 1900D (C-FBTR/CRN511) from Kelowna, BC (CYLW) to Prince George, BC (CYXS) experienced an issue with its landing gear while on approach to CYXS. The pilot decided to return to CYLW. The aircraft landed at CYLW at 1759Z without issue, with the Aircraft Rescue and Fire Fighting (ARFF) unit on standby. The pilot did not declare an emergency.
UPDATE from Airworthiness: A Civil Aviation Safety Inspector (CASI) looked into this occurrence. On approach into Prince George, BC (CYXS), the flight crew of CRN511 had no green "gear down" annunciation. Once the crew had established that the landing gear was down and locked, they chose to return to Kelowna, BC (CYLW), where maintenance could address the issue. Maintenance found that the landing gear green annunciators were unlatched and would only show green when pushed in and held. Once the annunciators were manually reset, they functioned normally. The flight crew had inadvertently unlatched the annunciators during flight, which caused the indication to be lost. The flight crew have been briefed on annunciator operation.

A privately registered Mooney M20K from Langley, BC (CYNJ) to Langley, BC (CYNJ) reported a faint emergency locator transmitter (ELT) signal on the ground as it taxied in and shut down. The ELT signal could only be heard by the tower on the hand-held radio (NICAN) with the squelch on. The incident was reported to the shift manager.

A CGPUC Holdings Ltd. Socata TBM 700 (C-GPUC) from Vancouver/Boundary Bay, BC (CZBB) to Red Deer, AB (CYQF), at FL310 and near the Princeton (YDC) very high frequency omnidirectional range (VOR), declared an emergency due to a pressurization issue. C-GPUC conducted a descent to 15,000 feet and returned to origin location.
UPDATE: TSB Report #A21P0012: C-GPUC, a Socata TBM 700 (Series A) turboprop aircraft destined for Red Deer, AB (CYQF), was at FL310 near the Princeton, BC (CYDC) VOR when the pilot declared an emergency due to a pressurization issue. The flight descended to 15,000 feet and returned to Boundary Bay, BC (CZBB).
UPDATE from Maintenance and Manufacturing: A Civil Aviation Safety Inspector (CASI) looked into this occurrence. The organizations Person Responsible for Maintenance (PRM) advised that the cause of the event was the failure of the COMM1 antenna to remain attached to the aircraft. In other words, a loss of pressurization occurred due to the Comm 1 antenna departing the aircraft. When the antenna departed the aircraft, it resulted in lost communications and a 3/4" hole in the bottom of the aircraft where the antenna cable was attached to the antenna, which is what led to the loss of pressurization. A subsequent inspection revealed that the antenna was held in place by 6 x 8/32 sealed screws, which are supposed to go into an 8/32 nut plate that is fastened to the doubler inside the fuselage. The inspection after the incident revealed that the aircraft (most likely) left the factory with #10 nut plates on the doubler, which meant that the screws were never truly fastened and the antenna was held on with PRC/sealant. The aircraft maintenance engineer (AME) was consulting with the manufacturer to find a solution. Service Difficulty Report (SDR) no. 20210223023 was submitted. No further action is required.

At Abbotsford, BC (CYXX), the ground (GND) frequency 121.8 MHz main and back up (b/u) transmit function and the automatic terminal information service (ATIS) frequency 119.8 MHz were unserviceable (U/S) due to construction at the airport terminal that involved telecommunication (Telco) lines. The Technology Operations Coordinator (TOC) was advised. The outage occurred from 1856Z to 1944Z. The tower used the hand-held radio (NICAN) frequency during the outage.

The tower controller instructed a PSA Airlines Bombardier CL-600-2D24 (JIA5020) from Toronto/Lester B. Pearson, ON (CYYZ) to Charlotte, NC (KCLT), holding on Taxiway V west of Runway 33R, to line up for Runway 33R. A Jazz Bombardier CL-600-2D24 (JZA8784) from Toronto/Lester B. Pearson, ON (CYYZ) to Washington National, VA (KDCA), holding on Taxiway D east of Runway 33R, thought the instruction was for them and proceeded to line up. JIA5020 held its position. Both aircraft departed without operational impact. There may have been some interference from simultaneous transmissions.

An American, corporately registered Cessna 650 (N891SH) from Toronto/Lester B. Pearson, ON (CYYZ0 to Charlotte, NC (KCLT) was issued the BETES 2 standard instrument departure (SID) from Runway 05 in CYYZ. After departure, contrary to the SID, N891SH was observed turning right, towards the departure path of Runway 06R. A China Southern Airlines Company Boeing 787-9 (B1243/CSN5052) from Toronto/Lester B. Pearson, ON (CYYZ) to Guangzhou Baiyun, China (ZGGG) was in the process of lining up on Runway 06R, and was held until N891SH cleared the area. When asked by the South Departure controller, the pilot of N891SH claimed to have mis-read the SID, and thought they were ok to turn right. No loss of separation. No impact to operations.

An Air Canada Boeing 787-9 (ACA410) from Toronto/Lester B. Pearson, ON (CYYZ) to Montreal/Pierre Elliott Trudeau, QC (CYUL) was issued instructions to taxi via Taxiways H and B, cross Runway 23, then taxi via J for Runway 15L. The aircraft turned right onto Taxiway H, away from B, and was held short of the threshold of Runway 23 until vehicles were able to vacate the area. No other impact to operations.

While attempting to relay a clearance to a privately registered Beech F33A from Toronto/Billy Bishop, ON (CYTZ) to Muskoka, ON (CYQA), it was discovered that the Muskoka (YQA) 122.3 MHz frequency was not working. Several IFR aircraft were held up due to the outage.

At London, ON (CYXU), the temperature, dew point and wind sensors failed, necessitating the use of the Vaisala hand-held unit. Technology Operations Coordinator (TOC) advised. This occurrence also took place the day before, but only included issues with the temperature and dew point. Apparently, the current issue stems from a different problem than the prior days issue. The portable Vaisala was reading up to 4 degrees higher than the air temperature from the other London sites: the local uncertified thermometer, and WSN (the local Environment Canada AUTO 8 station). Environment Canada Forecast called CYXU to advise that the surrounding sites were 3 to 4 degrees lower and they needed confirmation because the higher temperature supported a change in forecast and more potential for convective weather. Impact on operations: increase in workload, and risk of an incorrect forecast based on inaccurate backup.

A privately registered Cessna 182F from Toronto/Oshawa, ON (CYOO) to Scugog/Charles Landing, ON (Water) (CHS4) departed from Runway 23, and immediately requested to return for a landing due to an oil leak. The aircraft attempted to land on Runway 12 unsuccessfully and overshot the runway. The aircraft landed safely on Runway 23. The aircraft exited the runway and shut down until the airport manager (APM) arrived. Multiple aircraft held outside the control zone until runway inspections were complete.

A Diamond Flight Centre London Inc. Diamond DA 20-C1 (C-GDFO) from London, ON (CYXU) to London, ON (CYXU), inbound from the northwest (NW), was given a clearance. Shortly after, the pilot called on the tower land-line (while still outside of the control zone) and stated that they had lost communications. The pilot squawked 7600 and was once again cleared inbound. The pilot then re-established communications on their hand-held radio and landed without further incident.

An Aelous Flight Academy Inc. Cessna 172M (C-GPAS) from London, ON (CYXU) to London, ON (CYXU) landed on Runway 33 at CYXU after completing a local VFR flight, and subsequently reported a flat tire. C-GPAS held in Taxiway Hotel until towed to Apron 03. No operational impact.

Aviation Incident Report #17380: The Public Health Agency of Canada (PHAC) held the offloading of passengers on a WestJet Boeing 737-7CT (C-GWJG) from Vancouver, BC (CYVR) to Calgary, AB (CYYC). A passenger became irate due to being stuck on board the aircraft.

A power outage occurred at 2230Z at Rankin Inlet, NU (CYRT). A back up generator was started. The ability to transmit on 122.2 MHz was temporarily lost and an advisory had to be given via the hand-held radio (NICAN). A Nolinor Aviation Boeing 737-408 (C-GGWX) from Rankin Inlet, NU (CYRT) to Val-dOr, QC (CYVO) received an advisory and departed without delay. Transmitting was restored when the power returned at 2241Z. Technology Operations Coordinator (TOC) advised.