February 6, 2020

Incident at 4824N / 06558W

A KLM Royal Dutch Airlines flight (KLM267) reported severe turbulence at FL280. Halifax (HZ) flight information centre (FIC) was informed. No impact to operations.

January 20, 2020

Incident at 5804N / 07726W (Communication navigation surveillance/air traffic system)

An Air Inuit Boeing 737-2S2C (C-GAIG/AIE780) from La Grande-Rivière, QC (CYGL) to Puvirnituq, QC (CYPX) was cleared to descend to FL290. The aircraft read back FL280 and the readback error was not caught by the air traffic services (ATS) unit. No impact on operations.

January 4, 2020


An Air Inuit Ltd. Boeing 737-2Q2C (C-GMAI/AIE704) from La Grande-Rivière, QC (CYGL) to Puvirnituq, QC (CYPX) level at FL280 was cleared to leave controlled airspace below FL180 and was instructed to confirm that it left FL180. AIE704 reported having left FL180. The air traffic controller (ATC) contacted AIE704 to confirm that the aircraft was going to leave FL180, and the pilot confirmed. ATC cleared a Government of Quebec Canadair CL600-2B16 (Series 601-3R) (C-GURG/QUE10) from Puvirnituq, QC (CYPX) to Montreal/Trudeau, QC (CYUL) to climb to FL240 (aircraft travelling in the opposite direction) with an information exchange on the aircraft. At that moment, AIE704 said that it was leaving FL280. ATC corrected the situation and gave new clearance to QUE10 to stop its climb to 17 000 ft. No loss of separation.

March 7, 2020

Incident at 5307N / 11913W

An American, corporately registered Cessna 525B (N525L) from Valemount, BC (CAH4) to Calgary, AB (CYYC) was cleared to FL230. Air traffic control (ATC) observed N525L descending to FL220. ATC subsequently instructed N525L to climb to FL280. No impact to the operation.

May 25, 2020


An Air Canada Embraer ERJ 190-100 (ACA621) from Halifax/Stanfield Intl, NS (CYHZ) to Toronto/Lester B. Pearson Intl, ON (CYYZ) reported a strong emergency locator transmitter (ELT) signal when descending from FL280 to FL190, inbound to Toronto. The ELT became intermittent from FL190 to 13,000ft (the aircraft was 50NM East of Toronto). The signal disappeared when the aircraft descended below 13,000ft. The Joint Rescue Coordination Centre (JRCC) Trenton was advised. No other reports.

February 5, 2020

Incident at 5757N / 11737W

An Air Partners Corp. Cessna 560 Citation Ultra (SDE563) from High Level, AB (CYOJ) to Kelowna, BC (CYLW) departed CYOJ and reported established on the YOJ 200 degree radial. The controller cleared SDE563 to climb to FL280 on the YOJ 200 degree radial. SDE563 was observed on radar at FL222 on the 180 degree radial. The controller stopped the climb of SDE563 at FL230 until the aircraft was past a Can-West Corporate Air Charters Ltd. Beech 200 (CWA925) from Grande Prairie, AB (CYQU) to High Level, AB (CYOJ) that was at FL260. No other impact to operations

January 10, 2020

Incident at 4226N / 05812W

An El Al Israel Airlines Boeing 777-200 (4XECC/ELY026) on a flight from Newark Intl, NJ (KEWR) to Tel Aviv, Israel (LLBG) at FL360 declared an emergency with New York Oceanic Area Control Centre (NYOAC) due to smoke in the cabin. The aircraft entered Moncton (QM) airspace at FL280 and landed Halifax/Stanfield Intl, NS (CYHZ) at 0336Z without incident.

October 20, 2019

Incident at 4514N / 07340W

Although it had received and read back clearance to climb to FL230, a Jazz Bombardier CL-600-2B19 (C-GUJA/JZA8172) from Montreal/Pierre Elliott Trudeau Intl, QC (CYUL) to Washington/Dulles Intl, DC (KIAD) called Boston, MA (KBOS) on climb to FL280. No impact.

September 4, 2019

Incident at 5528N / 07638W

The required separation was not assured between an Air Inuit Boeing 737-275C (C­GSPW/AIE780) flying from Puvirnituq (CYPX), QC, to La Grande-Rivière (CYGL), QC, and a Government of Canada, Department of National Defence Lockheed C-130 (CFC85) flying from Trenton (CYTR), ON, to Resolute Bay (CYRB), NU. AIE780 was on departure from CYPX and climbing to FL280 in non-radar airspace, and CFC85 was cruising at FL270 on a converging course. Separation was maintained. No impact on operations.

August 5, 2019


Although it received and read back the descent clearance to FL280, a British Aerospace HS125 (C-GOHJ), operated by Hawker Limited Partnership, flying from Port-Menier, QC (CYPN) to Montreal/Pierre Elliott Trudeau, QC (CYUL) continued its descent after FL280. Despite quick action by the Air Traffic Controller (ATC), the space between C-GOHJ and a U.S.-owned and -operated Beech B300 (N506KB), flying from Manassas, VA (KHEF) to Goose Bay, NL (CYYR) was reduced to 3 NM and 800 ft.
UPDATE TSB #A19Q0132: C-GOHJ, a British Aerospace HS125 operated by Hawker Limited Partnership was conducting a flight from Port-Menier (CYPN), QC, to Montreal/Pierre Elliott Trudeau Intl (CYUL), QC. At 40 NM southwest of Quebec City, QC, it was cleared for a descent to FL280 and read back the clearance correctly. C-GOHJ continued descending below FL280. As a result, separation between C-GOHJ and N506KB, a Raytheon B300 flying from Manassas Regional Airport/Harry P. Davis Field (KHEF) to Goose Bay (CYYR), Labrador, was reduced to 3 NM and 800 feet, though separation should have been 5 NM or 1,000 feet.

July 11, 2019

Incident at 52NM MANIWAKI QC NDB (YMW)

After having received and correctly read back clearance to descend to FL290, an Air Canada Airbus A320-214 (C-FXCD/ACA396) from Calgary, AB (CYYC) to Montreal/Trudeau, QC (CYUL) was seen passing FL280 in descent. No impact on operations.

July 27, 2019

Incident at 40NM Kelowna (CYLW)

An Image Air Charter Ltd Cessna 525C (C-GNTL) from Kelowna, BC (CYLW) to Calgary, AB (CYYC) departed CYLW, and was cleared to and readback FL250. Climbing through FL250, C-GNTL asked for confirmation of FL280 cleared altitude. C-GNTL was re-cleared to FL310. No operational impact.

August 23, 2019


An Air Canada Embraer ERJ 190-100 IGW (C-FHNV/ACA451) from Ottawa/MacDonald-Cartier, ON (CYOW) to Toronto/Lester B. Pearson, ON (CYYZ) reported an emergency locator transmitter (ELT) at FL280 for approximately 3 minutes. No operational impact.

January 7, 2019


A SkyWest Airlines Bombardier CL-600 2B19 (series 200) (N461SW/SKW4875) from Ottawa/Macdonald-Cartier, ON (CYOW) to Detroit Metro/Wayne County, MI (KDTW) was cleared by the Concordia sector to climb to FL280. The sector ends at FL230 and no coordination was carried out with the Picton sector. No impact on operations.

December 14, 2019

Incident at 120NM E Charleston AFB, SC (KCHS)

TSB Report #A19F0319: C-GBHZ, an Airbus 319-114 operated by Air Canada Rouge, was conducting flight ROU1986 from Montréal/Pierre Elliott Trudeau (CYUL), QC to Punta Cana Intl. (MDPC), Dominican Republic. During cruise at FL380 in light turbulence, the flight crew felt vibrations and observed the right hand engine N1 indication rolling back, while all other indications were normal including engine vibration indications. The flight crew declared a PAN PAN and requested a descent. The aircraft descended to FL280 at which point the issue rectified. The flight crew decided to divert to the nearest suitable airport, which was Nassau/ Lynden Pindling Intl. (MYNN), Bahamas, where the aircraft landed without further incident.

November 5, 2019

Incident at 6650N / 10845W

A Summit Air Ltd. BAE Systems (Operations) Limit RJ85 (C-FLRJ/SU8533) from Hope Bay, NU (CHB3) to Yellowknife, NT (CYZF) reported an issue with its flaps and requested a descent to 14 000 feet but subsequently levelled at FL280 instead. No emergency declared. No impact to the operation.
UPDATE from Aircraft Maintenance & Manufacturing: A Civil Aviation Safety Inspector (CASI) looked into this occurrence. After departure from Hope Bay, NU, while climbing through FL310, the flight crew noted that the flap indicator had changed from 0 to 8 degrees down, but there was no change in flight performance to indicate that the flaps had physically moved. To perform the Quick Reference Handbook (QRH) checklist for this possible fault the aircraft descended and slowed to flap extended speed. Moments after completing the checklist the flap indicator moved back to 0. The flight continued to Yellowknife, NT, where on approach the flaps and indicator operated normally and the aircraft landed without further incident. Company maintenance inspected the aircraft and could not find any fault during the testing of the system, the aircraft was returned to service and there have been no further incidents.

October 16, 2019

Incident at 6926N / 13200W

Two Government of Canada, Department of National Defence, McDonnel Douglas CF-18 Hornets (ODIN21 and ODIN22) on flights from Inuvik/Mike Zubko, NT (CYEV) to Inuvik/Mike Zubko, NT (CYEV) were above the altitude restriction (ALTRV) POLAR BOX at FL280 and descended into the ALTRV without authorization. No impact to operations.

August 27, 2019

Incident at 6317N / 06912W

A Cargojet Boeing 767-33A (C-FPIJ/CJT262) from Iqaluit, NU (CYFB) to Hamilton, ON (CYHM) received and read back clearance to climb to FL280, but continued climbing to FL294 before being cleared to climb higher by the controller at high altitude. No impact on operations.

June 21, 2019

Incident at 5947N / 09046W

While in non-radar airspace, a foreign, corporately registered Cessna 525 (OE-FMD) from Iqaluit, NU (CYFB) to Churchill, MB (CYYQ) contacted the Winnipeg (WG) Centre and reported to be in descent to FL280 and proceeding direct to TAGEX. Canadian Automated Air Traffic System (CAATS) information indicated the route was direct Churchill, MB (CYYQ). OE-FMD was restricted to descend to FL280 due to traffic, a Keewatin Air Beech B200 (KEW209) from Churchill, MB (CYYQ) to Coral Harbour, NU (CYZS), in the vicinity of the new track. No loss of separation, no other operational impact.

March 20, 2019

Incident at In the vicinity of: EDMONTON INTL AB (CYEG) (Aerodrome, runway or taxiway shutdown)

A WestJet Encore Ltd. de Havilland DHC-8-402 (WEN3240) from Edmonton, AB (CYEG) to Grande Prairie, AB (CYQU) diverted to CYEG due to a hydraulic failure. The aircraft declared "PAN PAN" and requested emergency services at the airport. The pilot reported that they would be doing a high-speed flapless landing. The aircraft landed on Runway 20 without incident. Runway 20 was temporarily closed due to contamination. No other impact to operations.
UPDATE from Airworthiness: A Civil Aviation Safety Inspector (CASI) looked into this occurrence. C-GWEF had a hydraulic leak, along with #1 HYD ISO VLV Caution and ROLL SPLR INBD HYD Caution. Returned to Toronto, ON (YYZ). Maintenance found the #1 Anti-skid control valve Assy unions to be cracked. Replaced unions, checked serviceable and returned aircraft to service.
Update TSB Report #A19W0037: C-FENJ, a Bombardier DHC-8-400 aircraft operated by WestJet Encore, was conducting flight WEN3240 from Edmonton Intl (CYEG), AB to Grande Prairie (CYQU), AB with 4 crew members and 75 passengers on board. Shortly after reaching FL280 after the departure from CYEG, the aircraft experienced a leak in the number 1 hydraulic system. The flight crew declared a PAN PAN, and elected to return to CYEG. A flapless landing was conducted with ARFF standing by. The operator’s maintenance found a broken O-ring on the number 1 hydraulic manifold. After appropriate repairs were done, the aircraft was returned to service.

January 22, 2019

Incident at IQALUIT NU (CYFB) (Navigation error)

A Duncan Aviation Cessna 560XL (N560RD) from Iqaluit, NU (CYFB) to W.K. Kellogg, MI (KBTL) deviated during its standard instrument departure (SID) from Runway 34. Once it was at 5 000 ft, the aircraft turned en route and continued to climb, without clearance, to FL280. Air traffic services (ATS) fixed the situation. No impact on operations.

September 26, 2019

Incident at 4625N / 04823W

An American Airlines Inc. Boeing 767-328ER (N397AN/AAL734) from Philadelphia, PA (KPHL) to Manchester, UK (EGCC) flight reported a burning smell in the cockpit and declared an emergency, the flight followed contingency procedures and offset to descend to FL280 and proceed to St. Johns, NL (CYYT). Landed without further incident 0427Z.
Update TSB Report #A19A0076: N397AN, a Boeing 767-323ER aircraft operated by American Airlines, was conducting flight AAL734 from Philadelphia Intl (KPHL), PA USA to Manchester Intl (EGCC), UK. Approximately 200nm east of St John’s Intl (CYYT), NL, the crew had an odor in the cockpit that would not dissipate. The crew declared an emergency and requested a diversion to CYYT. The flight landed without further incident with ARFF standing by. Maintenance completed an inspection of the engines and APU and no discrepancies where found. The oven in the first class galley was found to have aluminum foil stuck in the oven fan. Maintenance placed the oven as non essential furnishing (NEF) and the aircraft was returned to service.

July 15, 2019

Incident at 4440N / 06550W

A WestJet Boeing 737-7CT (C-GWJF/WJA882) from Toronto/Pearson, ON (CYYZ) to Halifax/Stanfield, NS (CYHZ) was cleared to FL290 and the pilot read back that they were descending to FL290. The aircraft checked in with the low sector and reported descending to FL280. Controller asked the pilot to confirm their cleared level and they confirmed FL280. No impact on operations, safety was not jeopardized, no separation issues.

May 21, 2019


A Jazz Bombardier CL-600-2D24 (series 900) (C-GDJZ/JZA8630) from Ottawa/MacDonald-Cartier, ON (CYOW) to Halifax/Stanfield, NS (CYHZ) cleared to descend to FL290, was observed descending to FL280 without air traffic control (ATC) clearance. No loss of separation.

July 11, 2018


An Air Canada Boeing 787-8 (C-GHPQ/ACA005) from Montreal/Pierre Elliott Trudeau Intl, QC (CYUL) to Narita Intl, Japan (RJAA) reported that it was climbing to FL290 during initial contact with the PO sector, even though it had received and read back clearance from sector LA to climb to FL280. No impact on operations.

July 20, 2018

Incident at 6054N / 07720W

An Air Nunavut Beech B200 (C-FGXR/BFF203) from Iqaluit, NU (CYFB) to Sanikiluaq, NU (CYSK) declared an emergency due to engine failure. It returned to CYFB, where emergency vehicles were deployed. BFF203 landed without incident at 0222Z. No impact on operations.
Update - TSB Report #A18Q0115: C-FGXR, an Air Nunavut Beech B200, was on instrument flight rules (IFR) flight BFF203 from Iqaluit, NU (CYFB) to Sanikiluaq, NU (CYSK) with 2 pilots and 3 passengers on board. While the aircraft was in cruising flight 300 NM southwest of CYFB, the left engine failed. The crew declared an emergency and returned to CYFB. The aircraft landed without incident, and there were neither injuries nor damage.
Aviation Incident Report #15491: Twenty minutes after levelling off at FL280, (roughly 0100Z), an Air Nunavut Beech B200 (C-FGXR/BFF203) from Iqaluit, NU (CYFB) to Sanikiluaq, NU (CYSK) had its left hand (L/H) CHIP DETECT light illuminate briefly, then turn back off. The aircrafts circuit breaker for the L/H CHIP DETECT popped. Very shortly after, the L/H engine shuttered and made a loud grinding/screeching noise. The pilot immediately pulled the left power lever to idle and then called left engine failure and ran the engine shut down drill. The aircraft declared an emergency with air traffic control (ATC), and requested direct back to CYFB. Passenger oxygen masks were deployed as a result of rising cabin altitude. The crew requested a lower flight level, and the aircraft started to descend and levelled off at FL120, flying this altitude for the remainder of the leg. The aircraft commenced the area navigation (RNAV) 34 approach into CYFB and had an uneventful landing.

July 16, 2018

Incident at 5236n / 07253w

UPDATE AOR-235414-V2: Update to narrative: The narrative was replaced with "A Chrono Aviation Pilatus PC-12/47 (C-GDTL/NDL987) from Iqaluit, NU (CYFB) to Montreal/St-Hubert, QC (CYHU) was observed rapidly climbing to FL284 and descending back to FL280. NDL987 advised that the altitude deviation was related to the turbulence associated to the convective activity. No impact on operations.
A Chrono Aviation Pilatus PC-12/47 (C-GDTL/NDL987) from Iqaluit, NU (CYFB) to Montreal/St-Hubert, QC (CYHU) was observed rapidly climbing to FL284. NDL987 advised the north sector that they had to manoeuvre due to lightning in the vicinity. No impact on operations.

January 9, 2018

Incident at 4822N / 07754W

Shortly after its takeoff from Runway 36 at Val-d'Or, QC (CYVO) a Sunwing Boeing 737-8K5 (C-FAWC/SWG650) from Val-d'Or, QC (CYVO) to Montreal/Pierre Elliott Trudeau, QC (CYUL) was instructed to advise when it reached the very high frequency omnidirectional range (VOR) 180 radial from YVO. The aircraft confirmed that it was on the radial. Although it had received and read back the instruction to climb to FL280 and maintain the 180 radial until further notice, SWG650 was seen on the VOR 360 radial from YVO. Impact: A loss of separation with a Hydro-Quebec de Havilland DHC-8-311 (C-GJNL/HYD150), flying from Chibougamau/Chapais, QC (CYMT) to Rouyn-Noranda, QC (CYUY), which was descending for CYUY and leaving FL220.

May 22, 2018

Incident at 5008N / 12516W

A China Eastern Airlines Corporation Ltd. Airbus A330-200 (CES216) from Vancouver International, BC (CYVR) to Nanjing Lukou International, China (ZSNJ) that was climbing through FL280 and cleared to FL340 checked in with the Vancouver Center and reported the climb to FL360. The controller recognized the error and re-cleared the aircraft to FL340. No operational impact.

November 14, 2018

Incident at MYPAL intersection

At 2336Z, the Cleveland Air Route Traffic Control Center (ZOB) called to advise that a Sunwing Airlines Inc. Boeing 737-800 (SWG439) from Punta Cana Intl, DR (MDPC) to Toronto/Lester B. Pearson Intl, ON (CYYZ) had lost its primary flight display and would be requesting priority handling. At 2351Z, the ZOB controller advised Grimsby that SWG439 had an emergency (PAN PAN). Priority was given to SWG439 and they required no further assistance. SWG439 landed on Runway 06L at 0010Z. No operational impact.
UPDATE from Airworthiness: A Civil Aviation Safety Inspector (CASI) looked into this occurrence. Left hand (L/H) Air Data Inertial Reference Unit (ADIRU) was replaced and function checks were carried out. Checked serviceable and fault was cleared. Flight controls checked for proper operation. No fault was found. Aircraft was returned to service.
Update TSB #A18F0236: C-GMXB, a Boeing 737 MAX 8 aircraft operated by Sunwing Airlines, was conducting flight SWG439 from Punta Cana Intl (MDPC), Dominican Republic to Toronto/Lester B. Pearson Intl (CYYZ), ON with 6 crew members and 176 passengers on board. While the aircraft was in cruise flight at FL350, the flight crew received erroneous indications on the captains instruments. As a precaution, the flight crew elected to descend to FL250 in order to get out of Instrument Meteorological Conditions (IMC). Since the stand by and the first officers instruments were functioning normally, control of the aircraft was handed to the first officer. As the aircraft passed through FL280, approximately 50 nm northwest of Washington/Dulles Intl (KIAD), VA, the weather radar and TCAS both failed. The flight crew declared a PAN PAN and executed the QRH checklists. Subsequently, the left side IRS fault light illuminated. The flight continued to destination and landed without further incident. The operators maintenance replaced the left Air Data Inertial Reference Unit (ADIRU) and performed functional checks to confirm that the fault was cleared. The aircraft was returned to service.

September 18, 2018

Incident at 34 NM SE THUNDER BAY ON (CYQT) (ATS operating irregularity)

A Skyservice Aviation Learjet 45 (C-GEJD) from Thunder Bay, ON (CYQT) to Toronto/Lester B. Pearson, ON (CYYZ) was cleared to FL280. The pilot's incorrect read back of FL300 was not caught by the controller. When checking in with the next sector, the controller stopped C-GEJD at FL290 due to traffic.

May 2, 2018

Incident at 4909N / 09211W

A Jetport Inc. Bombardier BD-700-1A10 (C-FLGZ) from Sault Ste Marie, ON (CYAM) to Kenora, ON (CYQK) was instructed to descend to FL290 on heading 280 and correctly read back the clearance. C-FLGZ subsequently contacted the East Low Controller in descent through FL389, reported descending to FL280, and was issued further descent. No operational impact.

February 28, 2018

Incident at DEBUM intersection

A Belgium registered Beech B200C (OOASL) from Sept-Îles, QC (CYZV) to Cleveland Intl., OH (KCLE), at flight level 28 000 feet (FL280), planned DEBUM Q806 YQO but then missed waypoint on filed route. The aircraft flew DEBUM direct YQO. No operational impact.

January 26, 2018


A 6776281 Canada Inc. Canadair F 86 E (C-GSBR) on a flight from Ottawa/Gatineau, QC (CYND) to Akron, OH (KCAK) at FL280 advised air traffic control (ATC) that they were conducting an emergency descent at 7000 feet/minute due to an oxygenation problem. The controller acted quickly and gave turn instructions to a Porter Airlines de Havilland DHC-8-402 (C-GKQC/POE471) on a flight from Toronto/Billy Bishop, ON (CYTZ) to Montreal/Pierre Elliott Trudeau, QC (CYUL) at FL230, whose path was converging with C-GSBR. The minimum required separation of 5 miles could not be assured and was reduced to 3.6 miles due to the controller's quick reaction. C-GSBR returned to CYND and landed safely at 1900Z.
UPDATE TSB Report #A18O0021: C-GSBR , a Vintage Wings of Canada F86E Saber, was enroute at FL280 from Gatineau-Ottawa Executive Airport, ON (CYND) to Akron-Canton Regional Airport, OH (KCAK). While completing the cruise checklist the pilot noted that there was no oxygen flow being supplied to the pilot's mask. ATC was advised and an emergency descent begun. C-GKQC, a Porter Airlines DHC-8-400, operating as flight POE471 from Toronto City Center, ON (CYTZ) to Montreal Trudeau, QC (CYUL) was at FL230 and converging with the F86. The air traffic controller issued vectors to POE471 to avoid the descending F86. The two aircraft came within 3.6NM horizontally at FL230 where 5.0 NM of separation was required. Post - It was determined that the oxygen hose to the pilot's mask had been incorrectly attached. The F86 was pressurized to approximately 5.5 PSIG giving a cabin altitude of approximately 13 500'. The operator has since revised the preflight checklist to include an oxygen flow check.

January 23, 2018


An Air Canada Embraer ERJ 190-100 IGW (ACA608) from Toronto/ Lester B. Pearson, ON (CYYZ) to Halifax, NS (CYHZ) was cleared to FL230 and readback the clearance controller. ACA608 contacted the next controller and reported climbing to FL280 without authorization. No operational impact.

January 3, 2018

Incident at OLIGO intersection

A Sunwing Airlines Boeing 737-800 (SWG9382) on a flight from Ottawa/MacDonald-Cartier, ON (CYOW) to North Bay, ON (CYYB) checked in climbing through FL230. The aircraft stated that they were cleared to FL330 after being queried by the controller. The flight was recleared to FL280. No conflicts or operational impact.
UPDATE TO AIRCRAFT INFORMATION: Aircraft information changed from a "Sunwing Airlines Boeing 737-800 (SWG9382)" to a "TUI Airlines Belgium Boeing 737-8K5 (wet lease with Sunwing)".

December 19, 2018

Incident at 108NM NE George Bush Intercontinental, TX (KIAH)

TSB Report #A18F0290: C-FMZU, an Embraer 190-100 aircraft operated by Air Canada, was conducting flight ACA592 from Houston/George Bush Intercontinental (KIAH), TX to Toronto/Lester B. Pearson Intl (CYYZ), ON with 4 crew members and 65 passengers on board. Passing FL280 during the climb to cruising altitude, approximately 110 nm northeast of KIAH, the flight experienced continuous moderate turbulence. As the flight passed through FL300, the turbulence became severe and the flight crew observed the vertical speed in excess of 2500 feet per minute. A higher level was requested, however it was denied by ATC due to heavy traffic at FL320. The flight crew levelled off at FL310 in continuous moderate turbulence, and subsequently climbed to FL350 a short while later. The operator’s maintenance carried out a phase one inspection and found no faults. The aircraft was returned to service.

October 7, 2018

Incident at 4702N / 08636W

An Air Bravo Corp. Pilatus PC-12 (AB237) from Hamilton, ON (CYHM) to Thunder Bay, ON (CYQT) was level at FL290 on the hand off from the Minneapolis (MSP) Area Control Centre when the Canadian Automated Air Traffic System (CAATS) estimate received by the Winnipeg Area Control Centre (WG ACC) indicated that AB237 was at FL280. No operational impact. No loss of surveillance separation.

June 15, 2018


TSB Report #A18C0042: C-FKCJ, a Boeing 757-236 aircraft operated by Cargojet Airways Ltd., was conducting flight CJT570 from Winnipeg/James Armstrong Richardson Intl, MB (CYWG) to Montreal/Mirabel Intl, QC (CYMX). During the climb through FL280 there was a strong odour of smoke in the cockpit and the crew elected to return to CYWG. During the descent, the crew ran the checklist items and declared an emergency. The smoke odour dissipated briefly but returned a short time later. The smoke odour was not bad enough to require donning of oxygen masks or smoke goggles. The subsequent landing was uneventful with ARFF responding as the aircraft taxied to the apron. The crew did not require medical attention. Subsequent inspections, operational checks, and engine ground runs by the operator's maintenance personnel did not reveal the source of the smoke odour. The aircraft was returned to service.

March 23, 2018

Incident at 6800N / 08830W

A Panorama Fixed Wings Ltd. Pilatus PC-12/45 (PN727) on a flight from Iqaluit, NU (CYFB) to Cambridge Bay, NU (CYCB) was cleared to FL280. The aircraft read back the altitude. PN727 was observed to descend to FL270 without clearance. No impact on operations.

January 30, 2018

Incident at 5052N / 11354W

An Air Transat Airbus A310 (TSC180) on a flight from Calgary, AB (CYYC) to Cancun, Mexico (MMUN) was initially cleared to climb to FL210. The pilot read back the correct altitude. On first contact with CYYC enroute (ENRT), the aircraft indicated they were climbing to FL280. The controller corrected the clearance limit prior to TSC180 reaching it. No impact on operations.

December 22, 2018

Incident at 5613N / 04408W

At 1324Z an Aeroflot-Russian Airlines Boeing 777-M0ER (VQ-BQB/AFL100) from Sheremetyevo Intl Airport, Russia (UUEE) to New York/John F. Kennedy Intl Airport, NY (KJFK) descended from FL300 to FL280 without clearance. Opposite direction traffic of a Federal Express Corporation McDonnell Douglas MD-11F (N613FE/FDX9001) from Memphis Intl Airport, TN (KMEM) to Cologne Bonn Airport, Germany (EDDK) at FL290. AFL100 requested FL280 after it was asked to confirm flight level (FL).
Update TSB Report #A18A0098: VQ-BQB, a Boeing 777-300 aircraft operated by Aeroflot Russian Airlines, was conducting flight AFL100 from Moscow/Sheremetyevo Intl (UUEE), Russia to New York/John F. Kennedy Intl (KJFK), NY. N613FE, a McDonnell Douglas MD-11F aircraft operated by Federal Express, was conducting flight FDX9001 from Memphis Intl (KMEM), TN to Cologne-Bonn/Konrad Adenauer (EDDK), Germany. At approximate position 56°13 N / 044°08 W, AFL100 descended from FL300 to FL280 without a clearance. Opposing traffic was FDX9001 at FL290. Since the 2 aircraft did not establish the required vertical separation for 15 minutes before and after crossing tracks, a loss of separation occurred.

October 12, 2018

Incident at YYR 100 / 100

A KLM Boeing 777 200 (KLM95R) from Amsterdam, Netherlands (EHAM) to New York/John F. Kennedy, NY (KJFK) reported severe turbulence. Descended from FL300 to FL280. Halifax (HZ) flight information centre (FIC) advised.

September 20, 2018


An American corporately registered Cessna 560XL (N803JS) from Wilkes-Barre/Scranton Int'l Airport, PA (KAVP) to Charlottetown Airport, PEI (CYYG) reported severe turbulence 50 nautical miles west of Moncton, NB (YQM) VOR/DME during descent from FL300 and FL280.

August 14, 2018

Incident at 5020N / 04403W

At 0454Z and in position 5020N04403W, an American Airlines Inc. Boeing 757-223 (N194AA/AAL88) from Philadelphia International, PA (KPHL) to Shannon International, Ireland (EINN) advised that both high-frequency (HF) radios were unserviceable (U/S). The pilot noted that they were conducting contingency procedures, offsetting track and descending to FL280 and requesting a return to KPHL. Air traffic control (ATC) advised that there was traffic and a clearance was available at FL320. The flight was re-cleared without incident and exited the Gander Oceanic control area (CYQX OCA) at 0535Z.

June 15, 2018

Incident at 4823N / 03840W

At 0120Z, an AER Lingus Ltd. Airbus A330-200 (EIGEY/EIN118) from Washington, DC (KIAD) to Dublin, IRL (EIDW) declared a medical emergency, executed contingency procedures and descended to FL280. The aircraft was cleared dual-clutch transmission (DCT) for St. John's, NL (CYYT) upon reaching FL280. EIN118 landed at 0300Z without incident.
UPDATE to aircraft model and narrative: An Aviation Safety Program Analyst looked into this occurrence and the aircraft model was changed from "an AER Lingus Ltd. Airbus A330-200" to "an AER Lingus Ltd. Airbus A330-202". The narrative was replaced with "At 0120Z, an AER Lingus Ltd. Airbus A330-200 (EIGEY/EIN118) from Washington, DC (KIAD) to Dublin, IRL (EIDW) declared a medical emergency, executed contingency procedures and descended to FL280. The aircraft was cleared direct (DCT) for St. John's, NL (CYYT) upon reaching FL280. EIN118 landed at 0300Z without incident."

June 26, 2018

Incident at 5100N / 04000W

AT 0330Z, a Norwegian Air International Boeing 737-8 (IBK1820) from Warwick, RI (KPVD) to Cork, Ireland (EICK) declared MAYDAY, ill passenger, off setting 15 NM right. At 0333Z, IBK1820 advised in descent to FL280 (no traffic). At 0335Z, air traffic control (ATC) cleared IBK1820 to FL280 and upon reaching FL280, cleared direct PPSN 49/50 JOOPY Gander Int'l, NL (CYQX). At 0337Z, IBK1820 PPSN was 5058N/4006W. The aircraft landed Gander, NL (YQX) at 0506Z with no further incident.

May 16, 2018

Incident at 15NM SAINT JOHN NB (CYSJ)

A Government of Canada, Department of National Defence McDonnell Douglas F-18 (VIMY11) from Greenwood, NS (CYZX) to Bagotville, QC (CYBG) exited military area direct TAFFY at FL280. A WestJet Boeing 737-8 (C-FNAX/WJA247) from Halifax/Stanfield Int'l, NS (CYHZ) to Toronto/Lester B. Pearson Int'l, ON (CYYZ) was on converging track climbing to FL320. Diverging headings issued, no loss of separation. Minor operational impact.

April 10, 2018

Incident at 5818N / 03553W

A Lufthansa German Airlines Airbus A340-343 (DLH444) on a flight from Frankfurt, Germany (EDDF) to Atlanta, GA (KATL) declared a medical emergency and requested diversion to Reykjavik, Iceland (BIKF). The aircraft was re-cleared for present position direct Reykjavik, Iceland (BIKF) at FL280 and subsequently dumped fuel. The aircraft left Gander, NL (CYQX) airspace at 1318Z.

January 13, 2018


An Air Canada Airbus A320-211 (C-FGYS/ACA1216) on a flight from Halifax/Stanfield, NS (CYHZ) to Fort Lauderdale, FL (KFLL) reported landing gear door issue shortly after departure. The aircraft requested to level off at 5000', trouble shot the problem and advised Air Traffic Control (ATC) the problem was resolved. The aircraft was cleared up to FL280 and once at FL240, reported the problem had re-occurred and requested to level off and trouble shoot once again. The aircraft advised ATC the problem was resolved and would continue to destination. After being cleared to FL340, the flight reported the problem has re-occurred again and requested to divert to Montreal/Pierre Elliott Trudeau, QC (CYUL) for maintenance. No emergency or other assistance required.