May 13, 2020

Incident at In the vicinity of: ST-FELIX-DE-VALOIS (LOURDES-DE-JOLIETTE) QC (UFX) NDB

A strong and clear Emergency Locator Transmitter (ELT) signal was heard between the Saint-Félix-de-Valois non-directional beacon (UFX) and 10NM West of the Montreal (YUL) very high frequency omnidirectional range (VOR)/distance measuring equipment (DME) at FL340. Source unknown. The Joint Rescue Coordination Centre (JRCC) Trenton was notified.

March 12, 2020


Multiple reports of an emergency locator transmitter (ELT) starting around 1810Z, located near N43 19 22 W079 06 08 from A080 to FL340. Joint Rescue Coordination Centre (JRCC) Trenton advised. A Government of Canada, Department of Transport Beech C90A (TGO996) from Ottawa/MacDonald-Cartier, ON (CYOW) to Toronto/Lester B. Pearson, ON (CYYZ) located in hangar and ELT turned off. No operational impact.

February 15, 2020

Incident at 5830N / 08100W

At approximately 1820Z, a United States Armed Forces Military Airlift Command Lockheed C-5 (Galaxy) (RCH708) from Rota, Spain (LERT) to Fairfield/Travis Air Force Base, CA (KSUU) stated they had a pressurization problem and requested descent to FL250. While on descent, the crew indicated they would like to climb back up to FL340. No impact on operations.

January 23, 2020

Incident at 195NM NE ST. JOHN'S INTL NL (CYYT)

At time 2202Z and just west of 50N050W, a British Airways Boeing 787-9 (GZBKD/BAW293) on a flight from Heathrow/London Intl, UK (EGLL) to Washington/Dulles, VA (KIAD) declared a PAN PAN due to a pressurization issue and requested descent from FL410 to FL350. The flight was recleared to FL340. BAW293 reported the situation good at FL340 and PAN PAN cancelled at 2215Z. Flight continued to its destination and exited the Gander Intl, NL (CYQX) flight information region (FIR) at 2248Z.
UPDATE TSB Report #A20A0006: G-ZBKD, an Boeing 787-900 operated by British Airways, was conducting flight BAW293 from London Heathrow Intl. (EGLL), UK to Washington Dulles Intl. (KIAD), VA. The aircraft dispatched with the right air conditioning pack inoperative in accordance with the MEL. During the cruise portion while at FL410, the left air conditioning pack failed, resulting in a PACK ALTITUDE LIMIT warning. The checklist required a descent to FL340. At 195 nm NE of St John’s International Airport, NL (CYYT), the crew requested FL340, however it was denied by ATC. The crew then declared a PAN-PAN due to the pressurization issue and a descent to FL340 was made. Once the aircraft reached FL340, the crew reported the situation was normal and cancelled the PAN-PAN and continued to destination without incident.

October 21, 2019

Incident at 5050N / 07128W

The separation between a Turkish Airlines Airbus A330-200 (TCJOO/THY6364) from Toronto/Lester B. Pearson Intl, ON (CYYZ) to Istanbul, Turkey (LTBA), Turquie and an Icelandair Boeing 757-300 (TFFIX/ICE37B) from Reykjavik, Iceland (BIKF) to Toronto/Lester B. Pearson Intl, ON (CYYZ) was not assured. ICE37B was cleared to descend from FL340 to FL320 in radar airspace and THY6364 was in cruising flight at FL330, both with converging paths. Separation maintained; no impact on operations.

August 24, 2019


TSB #A19Q0148: C-GSPW, an Air Inuit Boeing 737-200 (AIE704) with 4 crew members and 35 passengers was on a regular instrument flight rules (IFR) flight from Montreal/Pierre Elliott Trudeau, QC (CYUL) to La Grande Rivière, QC (CYGL). After 10 minutes of cruising flight at FL340 on autopilot, there was an uncommanded rotation. The crew disconnected the autopilot and felt a vibration in the flight controls (buffet). After repositioning the aircraft at FL340, the crew requested a block altitude and when they re-engaged the autopilot, there was a second uncommanded rotation. The crew disconnected the autopilot and requested to descend to FL320. A passenger received minor injuries and an ambulance was requested at CYGL. There were 2 nurses on board who helped the cabin crew members with the injured passenger. The aircraft landed without incident at CYGL.

April 7, 2019

Incident at 37NM BAIE-COMEAU QC VOR/DME (YBC) (Communication navigation surveillance/air traffic system)

A Skyservice Business Aviation Learjet 45 (C-GMSY) from Baie-Comeau, QC (CYBC) to Montreal/Trudeau, QC (CYUL) was cleared for FL340 by air traffic services (ATS) at Montreal (UL), even though the airspace falls under the jurisdiction of Moncton (QM). There was no traffic in the are. No impact on operations.

April 6, 2019

Incident at 5953N / 07418W

An Air Inuit Boeing 737-2S2C (C-GAIG/AIE751) from Kattiniq/Donaldson, QC (CTP9) to Rouyn-Noranda, QC (CYUY) was cleared to climb to FL340 in airspace without surveillance. When it appeared on the radar, the aircraft was at FL344.

January 23, 2019

Incident at 5030N / 06520W

An Icelandair EHF Boeing 757-200 (ICE29E) from Keflavík International, Iceland (BIKF) to Tampa International, FL (KTPA) reported severe turbulence at FL360. The aircraft descended to FL340. No impact.

January 24, 2019

Incident at 5047N / 06430W

A LOT Polish Airlines Airbus A330-200 (LOT26) from Warsaw/Frederic Chopin, Poland (EPWA) to New York/John F. Kennedy International, NY (KJFK) reported severe turbulence at FL380, and descended to FL340.

January 16, 2019

Incident at In the vicinity of: ST-JEAN QC (CYJN) (ELT)

The loud and clear signal of an emergency locator transmitter (ELT) was heard in the Saint-Jean, QC (CYJN) area at FL340 for 30 seconds. Source unknown. Joint Rescue Coordination Centre (JRCC) Trenton was notified.

December 31, 2019

Incident at BOBSU intersection

An Air Canada Boeing 787-9 (C-FVLU/ACA858) on a flight from Toronto/Lester B. Pearson Intl, ON (CYYZ) to London/Heathrow Intl, UK (EGLL) was cleared to FL370 and was observed descending from FL350 to FL340 and speed decreasing by 80 knots. ACA858 re-initiated a climb to FL370. No impact to operations.

August 4, 2019


An Air Canada Airbus A320 (ACA149) from Toronto/Lester B. Pearson, ON (CYYZ) to Calgary, AB (CYYC) was transferred to an adjacent air traffic control (ATC) sector at FL320 when in fact the coordinated and expected altitude was FL340. No operational impact.

May 16, 2019


An Air Canada Rouge Boeing 767-300 (ROU1857) reported a strong emergency locator transmitter (ELT) signal at FL340, 20NM East of Midland, ON (YEE), at 2332Z. Multiple reports followed by aircraft at various altitudes in the area. A second aircraft (LOT45) reported an ELT signal at 10000, 40NM Northeast of Toronto/Pearson, ON (CYYZ), at 2335Z. A Porter Airlines aircraft (POE266) confirmed an intermittent ELT signal while descending through 9000, 40NM Northeast of CYYZ, at 2340Z. The Joint Rescue Coordination Centre (JRCC) Trenton was advised.

May 10, 2019

Incident at TORNI intersection (ELT)

A weak emergency locator transmitter (ELT) report was received from an Image Air Charter Ltd. Bombardier CL-600-2B16 (Series 604) (C-FNVT) from Montreal/Saint-Hubert, QC (CYHU) to Toronto/Pearson, ON (CYYZ) in the vicinity of 20NM West of Ottawa/Macdonald-Cartier, ON (CYOW) at FL340. The ELT signal duration was reported to be one minute, and ended abruptly at 1538Z. The Joint Rescue Coordination Centre (JRCC) Trenton was advised.

December 6, 2019

Incident at 110NM N Pittsburgh Intl (KPIT)

TSB Report #A19F0316: C-GKVV, a Boeing 737-800 operated by Sunwing Airlines Inc., was conducting flight SWG640 from Toronto/Lester B. Pearson Intl. (CYYZ), ON to Holguin/Frank País Intl. (MUHG), Cuba. During the climb to FL340, a TCAS RA "level off" was received at FL335 due to crossing traffic at FL350. The RA was followed. The flight crew was advised of the traffic by ATC. The flight continued to destination without further incident.

July 11, 2019

Incident at 640NM SW Daniel K Inouye, Honolulu (PHNL)

TSB Report #A19F0176: C-FNNH, an Air Canada Boeing 777-233LR was operating as flight ACA033 from Vancouver (CYVR), BC to Sydney (YSSY), Australia with 15 crew members and 269 passengers on board. Approximately 7 hours into the flight (ADOWA waypoint; 640 nm sw of Honolulu, Hawaii) the aircraft encountered severe turbulence at FL340 for 10 to 15 seconds. During the encounter several passengers and some cabin crew were thrown in to the ceiling of the cabin. In total, 37 people (31 passengers and 6 cabin crew) identified that they had sustained sprains, strains, cuts and bruises. The flight crew decided to divert to Honolulu (PHNL), Hawaii which was approximately 2 hours away. While en route to PHNL, first aid was given by the cabin crew and voluntary medical professionals that were passengers on ACA033. In preparation for landing, fuel was dumped and EMS was positioned to meet the aircraft. Maintenance conducted a severe turbulence inspection and no faults were found. There was damage to interior components and cabin furnishings where passengers and cabin crew had come into contact with those items.

June 2, 2019

Incident at 4500N / 09500W (ELT)

A United States Air Force McDonnell Douglas C-17 Globemaster II (TURTLE8) from Charleston, SC (KCHS) to Joint Base Elmendorf-Richardson, AK (PAED), Northwest bound at FL340, reported a strong emergency locator transmitter (ELT) signal for 2 minutes. The signal ended abruptly. The Winnipeg Area Control Centre (ACC) and the Joint Rescue Coordination Centre (JRCC) Trenton were notified.

November 30, 2019

Incident at 10NM NW Mackar Inlet NU (ATS operating irregularity)

An Asiana Airlines Airbus A350-900 (HL8363/AAR223) from New York/John F. Kennedy, NY (KJFK) to Incheon, South Korea (RKSI) and an emirates Boeing 777-333ER (A6EPY/UAE221) from Dubai, United Arab Emirates (OMDB) to Dallas/Fort Worth, TX (KDFW) were on a crossing track. Both flights were identified but the controller did not have either aircraft on frequency resulting in a loss of separation. No impact to operations.
UPDATE TSB Report #A19C0146: A6EPY, a Boeing 777-300 operated by Emirates Airlines conducting flight UAE221 from Dubai Intl. (OMDB), UAE to Dallas/Forth Worth (KDFW), TX. HL8363, an Airbus 350-900 operated by Asiana Airlines, was conducting flight AAR223 from New York/John F Kennedy Intl. (KJFK), NY to Seoul/Incheon Intl. (RKSI), Republic of Korea. The aircraft were on a crossing track and were identified, but the controller did not have either aircraft on frequency. Due to a conflict alert, the controller issued instructions via controller/pilot data link communication (CPDLC). In accordance with the instructions, UAE221 descended to FL340, and AAR223 climbed to FL370, when the aircraft were approximately 21 NM apart. As the flights crossed, a loss of separation occurred. Separation was reduced to 1000 feet and 30 seconds, where 1000 feet and 10 minutes was required.

February 7, 2019

Incident at BUDUM intersection (Communication navigation surveillance/air traffic system)

An Etihad Airways P.J.S.C. Boeing 777 300 (ETD89Q) from Abu Dhabi Intl Airport, UAE (OMAA) to Los Angeles Intl Airport, CA (KLAX) requested FL360 through Rekjavik. FL360 was approved by Edmonton area control centre (ACC) and not updated in Canadian Automated Air Traffic System (CAATS). The aircraft entered Edmonton (EG) airspace at FL360 when CAATS data showed at FL340. No loss of separation and no impact to operations.

September 2, 2019

Incident at In the vicinity of: MONCTON CENTRE / ACC DE MONCTON

An Emergency Locator Transmitter (ELT) signal, strength 5, was reported by a Global Air Charters aircraft (GJE1209) at FL430 between 4543N/6204W and 4509N/6425W. Aircraft notified Air Traffic Control (ATC) at 1940Z when they stopped hearing the ELT. The Joint Rescue Coordination Centre (JRCC) Halifax was notified. No impact on operations, safety not jeopardized. At 2028Z, there was a second report of the signal, also strength 5, from an Air Canada aircraft (ACA621) climbing through FL270 at 4507N/6251W. JRCC Halifax was notified. At 2044Z, there was a third report of the signal, still at strength 5, from an Aer Lingus aircraft (EIN1KL) at FL340 and 4607N/6511W. JRCC Halifax was notified.

September 3, 2019

Incident at 4538N / 06614W

An Aer Lingus Airbus aircraft (flight EIN1AC) reported severe turbulence at FL400. The aircraft descended to FL320 and also reported severe turbulence from FL365 to FL340. The aircraft reported a smooth ride at FL320. The Halifax (HZ) Flight Information Centre (FIC) was advised. No impact on operations.

September 7, 2019

Incident at 5156N / 06439W

A Brussels Airlines Airbus A330-300 (OOSFD/BEL1CP) on a flight from Brussels, Belgium (EBBR) to New York/John F. Kennedy Intl, NY (KFJK) reported moderate to severe turbulence at FL320. The aircraft climbed to FL340 and the ride was smooth.

May 30, 2019

Incident at 5938N / 05228W

A WestJet Boeing 767-338 (C-GOGN/WJA4) from Gatwick, England (EGKK) to Toronto/Lester B. Pearson, ON (CYYZ) was at FL330. The aircraft requested FL350, and was given a clearance (CLX) by air traffic control (ATC) for FL340 and issued requested level not available. Shortly after, WJA4 was observed at FL347 before the aircraft returned back down to cleared level of FL340. There was traffic at FL350, 6 minutes behind.

May 25, 2019

Incident at 4645N / 06313W

A Sata Internacional Azores Airlines Airbus A321-211 (RZO377) from Joao Paulo II, Portugal (LPPD) to Toronto/Lester B. Pearson, ON (CYYZ) reported severe turbulence at FL340 and climbed to FL360. No reported injuries or damage.

October 7, 2018

Incident at In the vicinity of: 4930N / 06000W

A Norwegian Air International Boeing 737 700 (IBK1762) from New Windsor, NY (KSWF) to Dublin, Ireland (EIDW) reported severe turbulence and descended from FL370 to FL340. No reported damages or injuries. Halifax (HZ) flight information centre (FIC) notified.

September 5, 2018

Incident at 4635n / 07653w

After giving out clearance to descend to FL350, air traffic control (ATC) did not receive a clearance read-back. An Air Transat Boeing 737-800 (TSC774) from Vancouver Intl, BC (CYVR) to Montreal/Pierre Elliott Trudeau, QC (CYUL) was seen in descent at FL347. When questioned, the aircraft mentioned that he was descending to FL340. No impact on operations.

July 1, 2018

Incident at 4844N / 07715W

After having received and read back the instruction to descend to FL300, just before levelling off, an Icelandair Boeing 757-200 (TFISJ/ICE855) from Keflavik, Iceland (BIKF) to Chicago O'Hare, IL (KORD) was seen climbing to FL315. The aircraft was then given clearance for FL340. No impact on operations.

April 29, 2018

Incident at 4904N / 07445W (ELT)

Emergency locator transmitter (ELT) signalled by a Boeing 737-200 operated by First Air (FAB861) at FL340 at 4904N 07445W. Source unknown. Joint Rescue Co-ordination Centre (JRCC) Trenton was notified.

April 14, 2018

Incident at 4821N / 06519W

A Dreamjet Boeing 757 200 (FHTAG/DJT102) from Paris/Charles de Gaulle, France (LFPG) to Newark, NJ (KEWR) encountered moderate to severe turbulence at FL400 and requested to descend to FL340. The turbulence was present from FL400 to FL380, then conditions improved. No injuries or damage to the aircraft were reported.

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.

March 29, 2018

Incident at 20NM PORT HARDY BC (CYZT) (Weather balloon, meteor, rocket, CIRVIS/UFO)

An Alaska Airlines Boeing 737-790 (N613AS/ASA127) on a flight from Seattle-Tacoma, WA (KSEA) to Anchorage, AK (PANC) reported seeing white balloon at FL340.

December 16, 2018


An Envoy Air Inc. Embraer ERJ 170-200 LR (N229NN/ENY4053) from Buffalo International, NY (KBUF) to Chicago/OHare International, IL (KORD) was cleared to FL320 and read back correctly. The aircraft was then observed climbing above the cleared level and was subsequently re-cleared to FL340, at the pilots request. No impact on operations.

December 19, 2018

Incident at 4855N / 08457W (Weather balloon, meteor, rocket, CIRVIS/UFO)

An Air Canada Airbus A320 (ACA333) from Montréal/Pierre Elliott Trudeau International, QC (CYUL) to Edmonton International, AB (CYEG) at FL360 and an Air Inuit Boeing 737-200 (AIE753) from Kattiniq/Donaldson, QC (CTP9) to Val-dOr, QC (CYVO) at FL340 reported seeing a very large meteorite. No operational impact.

October 23, 2018


An Air Canada Boeing 737-8 (C-FSEQ/ACA778) from Los Angeles Intl, CA (KLAX) to Montreal/Pierre Elliott Trudeau Intl, QC (CYUL) descending to cleared level FL350 reported and responded to a traffic alert and collision avoidance system resolution advisory (TCAS RA) as they descended through FL354. Crossing traffic level as FL340 and traffic information had been passed.

August 3, 2018


At FL340, an Alaska Airlines Airbus A320 (ASA1353) from Boston Logan Int'l, MA (KBOS) to San Francisco Int'l, CA (KSFO) reported hearing a strong emergency locator transmitter (ELT) signal for about a minute and then it abruptly ended. The Joint Rescue Coordination Centre (JRCC) Trenton was advised.

July 6, 2018

Incident at 4736N / 08809W (ELT)

An emergency locator transmitter (ELT) signal was reported by overflying aircraft at FL340. The source was undetermined. No impact to operations. The joint rescue coordination centre (JRCC) Trenton was advised.

June 3, 2018

Incident at IGSAP intersection

An Air Canada Embraer ERJ 190-100 IGW (ACA619) from Halifax, NS (CYHZ) to Toronto, ON (CYYZ) received a Traffic Alert and Collision Avoidance System (TCAS) Resolution Advisory (RA) while descending to FL340. Adjust vertical speed RA was followed. Traffic was a Wow Air EHF Airbus A321-211 (WOW9JW) from Toronto, ON to Reykjavík?Keflavík, Iceland (BIKF) at FL330. No operational impact.

May 27, 2018

Incident at UDMUG intersection

A loss of separation occurred between a Jet Airways (India) Ltd. Boeing 777-300 (JAI233) from Toronto/Pearson International, ON (CYYZ) to Amsterdam Airport Schiphol, the Netherlands (EHAM) and a Miami Air Int'l, Inc. Boeing 737-800 (BSK294) from Gander International, NL (CYQX) to Minneapolis/Saint Paul International, MN (KMSP) in the vicinity of the UDMUG intersection. JAI233 was climbing through a FL336 to a cleared altitude of FL350 and BSK294 was at FL340.

January 16, 2018

Incident at KASED intersection

An Air Canada Boeing 767-375 (C-GLCA/ ACA009) from Toronto/ Lester B. Pearson, ON (CYYZ) to Calgary, AB (CYYC), level at F340 reported 'a big bump' wake turbulence encounter in vicinity of 12 nm west of KASED while approximately 10 NM and 1 minute 35 seconds behind an Alaska Airlines Airbus A320-214 (N843VA/ ASA1351) from Boston, MA (KBOS) to San Francisco, CA (KSFO), also at FL340.

December 23, 2018

Incident at 128NM SSE KPHX - Phoenix Sky Harbour Intl

Updated TSB Report #A18F0297: C-FPDN, an Airbus 320-200 aircraft operated by Air Canada, was conducting flight ACA977 from Los Cabos Intl (MMSD), Mexico to Calgary Intl (CYYC), AB with 5 crew members and 112 passengers on board. The aircraft had been released with the pack number 2 under MEL provisions. During cruise flight at FL340, the flight crew received a PACK 1 + 2 FAULT ECAM message. Pack number 1 was reset successfully, however the flight crew observed that the pack temperature was in the amber range at 245°C. As a precaution, the flight crew decided to divert the aircraft to Phoenix/Sky Harbor Intl (KPHX) AZ, descended initially to FL260, and then to 10 000 feet ASL. At no time did the cabin altitude exceed 7000 feet, and no emergency was declared. The flight landed at KPHX without further incident. The operator’s maintenance is investigating. The same aircraft experienced a similar event the following day (TSB occurrence A18F0298).

September 27, 2018

Accident at N52/W020

TSB #A18F0223:C-GFAT, an Airbus 310-300 aircraft operated by Air Transat, was conducting flight TSC258 from Montreal/Pierre Elliott Trudeau Intl, QC (CYUL) to Barcelona/El Prat, Spain (LEBL) with 9 crew members and 205 passengers on board. During cruise flight at FL340 in the vicinity of 52N/020W, the aircraft encountered severe Clear Air Turbulence (CAT). The auto-pilot disconnected, and the aircraft gained 300 feet very rapidly. The flight crew regained control of the aircraft and descended back down to FL340. Since the flight crew had no advanced indication, the seat belt sign was off at the time of the event. Two passengers and two cabin crew members received minor injuries, while another passenger received a serious injury, and was transported to the hospital upon arrival at LEBL. All four minor injuries were treated in flight, and the two cabin crew members were able to continue with their duties.The aircraft was inspected by the operator’s maintenance upon arrival at LEBL, and was released back to service.

August 7, 2018

Incident at 63 NM SSE Oakland International Airport (KOAK)

TSB #A18F0181: C-FFWN, an Airbus 320-200 aircraft operated by Air Canada, was conducting flight ACA559 from Los Angeles Intl, CA (KLAX) to Vancouver Intl, BC (CYVR) with 5 crew members and 145 passengers on board. During cruise flight at FL320, approximately 7 nm North of the Salinas VOR (SNS), the flight crew received a TACAS TA, which was followed shortly thereafter by an RA to CLIMB. The flight crew executed the command until a CLEAR OF CONFLICT aural message was received, levelled off at FL345, and notified ATC of the situation. At the flight crew?s request, ATC cleared ACA559 back down to FL340, and the flight continued to destination without further incident. The other aircraft involved has been identified as N261WN, a Boeing 737-700 aircraft operated by Southwest, who was conducting flight SWA554 from Oakland/Metropolitan Intl, CA (KOAK) to KLAX. The closest lateral/vertical distance recorded was 4.7 nm laterally and 775 feet vertically.

July 9, 2018

Incident at Rhein FIR

TSB #A18F0159: C-FTOH, a Boeing 737-800 aircraft operated by Sunwing Airlines on behalf of TUI fly Netherlands, was conducting flight TFL712 from Bodrum/Milas, Turkey (LTFE) to Amsterdam/Schiphol, Netherlands (EHAM). As the flight was authorized to descent to FL340, the flight crew received a TCAS RA to LEVEL OFF. The aircraft was leveled off as directed, followed by instructions from ATC to level off. ATC then advised TFL712 that they were clear of the conflict, and cleared the flight to further descent before being handed to the next sector. Due to congestion on the frequency, ATC was not notified of the RA.

January 2, 2018

Incident at CLEVELAND, OH (KCLE)

TSB Report#A18F0002: C-FEAK, a Boeing 737-86Q aircraft operated by Sunwing, was conducting flight SWG519 from Montreal/Pierre Elliott Trudeau Intl., to Cancun/Cancun Intl., Mexico (MMUN) with 6 crew members and 188 passengers on board. During cruise, SWG was instructed to make a 25 degree right turn. The flight crew then received a TCAS RA to DESCEND, to which they responded. SWG519 obtained visual contact of the conflicting traffic, and when clear, notified ATC. The flight resumed cruise at FL340, and continued to destination without further incident.

April 30, 2018

Incident at 6228N / 11910W (Weather balloon, meteor, rocket, CIRVIS/UFO)

A Kalitta Charters II Boeing 747-400 (CKS2657) on a flight from New York/John F. Kennedy, NY (KJFK) to Anchorage, AK (PANC) at FL340-360 reported an object flying sporadically, estimated at FL600-FL800 and moving at Mach 4. Details passed to North American Aerospace Defence Command (NORAD).

December 27, 2018


The Winnipeg area control centre (ACC) controller instructed an Airsprint Inc. Cessna 525A (C-FIAS/ASP511) from Swift Current, SK (CYYN) to Calgary Intl, AB (CYYC) to climb to FL340 without coordination with the sector responsible for FL290 and above. No other aircraft in the vicinity and no impact to operations.

August 5, 2018

Incident at PELEE intersection

An Air Canada Boeing 777-300 (ACA879) from Zurich, Switzerland (LSZH) to Toronto/Lester B. Pearson International, ON (CYYZ) was authorized for and correctly read back a clearance to descend to F340. A few moments later, an Air China Ltd. Boeing 787-9 (B1466/CCA879) from Beijing Capital International, China (ZBAA) to Montreal/Pierre Elliott Trudeau International, QC (CYUL) was observed descending through FL350 for FL340. When questioned, CCA879 thought the authorization was intended for them. No operational impact.

August 12, 2018


An American, corporately registered Gulfstream GIV-X from Regina Int'l, SK (CYQR) to Terrace, BC (CYXT) on the REGINA 2 departure, reported climbing to FL340 instead of the prescribed altitude. No operational impact.

June 18, 2018

Incident at AYROU intersection (Communication navigation surveillance/air traffic system)

The EG controller transferred an American Airlines Boeing 777-200 (AAL109) from London/Heathrow, UK (EGLL) to Los Angeles International, CA (KLAX) to the UL controller at FL340 with the Canadian Automated Air Traffic System (CAATS) indicating the flight at FL360. No impact on operations.