July 14, 2020

Incident at 5003N / 13146W

A Western Global Airlines McDonnell Douglas MD 11F (N512JN/WGN7342) from Las Vegas/McCarran, NV (KLAS) to Anchorage, AK (PANC) had been cleared to and was levelled at FL380. Controller noticed the aircraft at FL390. Controller queried pilot and pilot in command (PIC) advised that they possibly received a clearance from California. WGN7342 was instructed to return to FL380. No impact to operations.

March 11, 2020

Incident at 120NM S Denver Intl, CO (KDEN)

TSB Report #A20F0067: C-FYJE, an Airbus 319-114 operated by Air Canada Rouge was conducting flight ROU1890 from Montréal/Pierre Elliott Trudeau (CYUL), QC to Phoenix Sky Harbor Intl. (KPHX), AZ. During cruise at FL390, Flight Crew identified increasing left hand engine (#1) vibration and spool back. Flight Crew initiated QRH procedures, notified the ATC and declared a PAN PAN. The flight descended to FL300 where the engine stabilized at 50% N1 and subsequently returned to normal operations. The flight crew elected to divert to Denver Intl. (KDEN), CO as a precaution and the flight landed without further issues.

May 30, 2020

Incident at 80NM S WHITEHORSE/ ERIK NIELSEN INTL (CYXY)

TSB Report #A20F0101: N123DQ, a Delta Air Lines Airbus Canada Limited Partnership BD-500-1A10 (CS100) was performing a flight from Fairbanks Intl. (PAFA), AK, to Seattle-Tacoma Intl. (KSEA), WA. During cruise at FL390, 80nm south of Whitehorse/Erik Nielsen Intl. (CYXY), YT, the flight crew observed an electrical surge, which disengaged the auto-throttles and caused a display to flicker. The flight crew noted that no checklists or messages were displayed on the electronic centralized aircraft monitor (ECAM), and the autothrottles were re-engaged without issue. At that time, the flight crew started the auxiliary power unit (APU), which also did not power up the left side. The flight crew contacted maintenance personnel via SATCOM and reset the left generator at their request, which still did not remedy the issue. The flight crew declared an emergency and initiated the diversion towards CYXY. On final, the flight crew noted that they received low pressure and low quantity indications for the right hydraulic system and shut down the hydraulic pump, as per the checklist. The flight landed in CYXY without further incident.

March 10, 2020

Incident at 4947N / 11324W

An Air Transat Airbus A321-211 (TSC21) from Victoria, BC (CYYJ) to Montreal/Pierre Elliott Trudeau, QC (CYUL) reported encountering severe turbulence +/- 500 feet at FL390. They requested a change of altitude and were then issued a descent to FL370. The 1000 feet separation was suspended in that region and the Flight Information Centre (FIC) was notified. No further impact to operations.

January 11, 2020

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

Severe turbulence reported at FL390 by a Brussels Airlines aircraft (BEL1CP). The aircraft did not change altitude.

March 3, 2020

Incident at GANDER CENTRE / ACC DE GANDER

An American Airlines Boeing 777-200 (N792AN/AAL39) from London/Heathrow, United Kingdom (EGLL) to Miami, FL (KMIA) climbed to FL390 and was expected to climb to FL380. No other traffic was affected. No impact to operations.

February 18, 2020

Incident at 4630N / 06243W

A Virgin Atlantic Airways Airbus A330-200 (C-GVWND/VIR110) from Atlanta/Hartsfield-Jackson, GA (KATL) to Manchester, United Kingdom (EGCC) reported an Emergency Locator Transmitter (ELT) signal at FL390 lasting 10 seconds.

July 24, 2019

Incident at 4638N / 07213W (ELT)

A loud and clear emergency locator transmitter (ELT) signal was heard for a minute by an aircraft at FL390. The signal disappeared at 4641N/07201W. Joint Rescue Coordination Centre (JRCC) Trenton was notified.

February 28, 2019

Incident at 5118N / 11903W

A WestJet Boeing 737-700 (WJA192) from Victoria Intl, BC (CYYJ) to Edmonton Intl, AB (CYEG) reported that the first officer was incapacitated. No emergency was declared. WJA192 landed safely at 0554Z.
Update TSB Report #A19W0029: C-GSWJ, a Boeing 737-700 aircraft operated by WestJet, was conducting flight WJA192 from Victoria Intl (CYYJ), BC to Edmonton Intl (CYEG), AB with 5 crew members and 32 passengers on board. During cruise flight at FL390 in the vicinity of Kamloops (CYKA), BC, one of the flight crew members became incapacitated and was unable to perform flying duties. A cabin crew member assisted the pilot to the rear of the aircraft, while MedLink was consulted. The flight continued to CYEG where it landed without further incident. The aircraft was met at the gate by Emergency Medical Services (EMS). The pilot was assessed, and released shortly thereafter.

December 6, 2019

Incident at 18NM TIGET intersection (Communication navigation surveillance/air traffic system)

An Air Canada Boeing 787-8 (ACA868) on a flight from Toronto/Lester B. Pearson Intl, ON (CYYZ) to London/Heathrow Intl, UK (EGLL) was flight planned at FL330 and requested FL390 which was approved. Electronic flight strip (EFS) was not updated with the cleared altitude.

April 4, 2019

Incident at 4839N / 09119W

A WestJet Boeing 737-700 (WJA656) from Calgary, AB (CYYC) to Toronto/Pearson, ON (CYYZ) was observed climbing without a clearance. The aircraft left the cleared altitude of FL390 and reached FL410. When queried, the aircraft descended to FL390 and indicated having lost reduced vertical separation minimum (RVSM) certification. No other aircraft in the vicinity and no impact to operations.

September 6, 2019

Incident at 180.00 Nautical miles NNW From LERS - Reus - Reus, Catalonia,

TSB Report #A19F0267: C-GLRN, a Boeing 737-800 aircraft operated by Sunwing Airlines Inc., was conducting flight TOM1574, from Shannon Intl (EINN), Ireland to Reus (LERS), Spain with 6 crew members and 170 passengers on board. The flight crew was cleared to begin their descent into LERS, from FL390 to FL370. During the descent through FL375 a TCAS TA followed by a TCAS RA to level off was received. The crew complied with the instruction and advised air traffic control. The flight was then cleared to continue their descent, and the flight continued uneventfully.

June 9, 2019

Incident at 4852N / 04412W

An Air Transat Airbus A330-243 (C-GTSJ/TSC442) from Montreal, QC (CYUL) to Venice, Italy (LIPZ) cleared to climb from FL390 to FL400, and ascended through the clearance limit to FL406 before descending to FL400. No traffic. No impact to operations.

May 26, 2019

Incident at HOCKE intersection (ELT)

A United Airlines Boeing 757-224 (N14102/UAL824) from Los Angeles, CA (KLAX) to Boston, MA (KBOS) at FL390 reported a short strong emergency locator transmitter (ELT) signal approximately 20NM East of HOCKE. Joint Rescue Coordination Centre (JRCC) Trenton was advised at 1903Z.

April 16, 2019

Incident at 5800N / 03654W

A Virgin Atlantic Airways Boeing 787-9 (GVBEL/VIR20V) from San Francisco, CA (KSFO) to London, UK (EGLL) declared PAN PAN due pressurization issues, requested lower, and was cleared lower. No traffic or impact to operations.
Update TSB #A19A0020: G-VBEL a Boeing 787-9 aircraft operated by Virgin Atlantic, was conducting flight VIR20 from San Francisco Intl (KSFO), CA to London/Heathrow (EGLL), UK. During cruise flight, the flight crew initiated a climb from FL390 to FL410. The flight crew noted that the cabin altitude started to rise at a rate of 600 feet per minute, deviating from the normal 6000 feet. Manual cabin pressure control was selected, and a PAN PAN was declared. The flight crew elected to descend back down to FL390. The aircraft had been dispatched under Minimum Equipment List (MEL) provision for an inoperative Cabin Air Compressor (CAC) on the left air conditioning pack. Section 2 of the B787 MEL notes that the cabin altitude, which is normally 6000 feet, may rise to 8000 feet with an inoperative pack or CAC in degraded operations. After review of this section of the MEL, the flight crew continued to destination without further incident.

October 12, 2019

Incident at 4823N / 06043W

A TAP Air Portugal Airbus aircraft (TAP237) reported moderate to severe turbulence at FL390. The aircraft requested and was cleared to descend to FL360. The Halifax (HZ) Flight Information Centre (FIC) was notified. No emergency or impact to operations.

October 17, 2019

Incident at 4433N / 05731W

An Iberia Lineas Aereas de Espana Airbus A350-900 (IBE6250) on a flight from New York/John F. Kennedy Intl, NY (KJFK) to Madrid, Spain (LEMD) reported severe turbulence at FL390. The aircraft descended to FL370. No emergency or impact to operations.

October 7, 2019

Incident at WABUSH NL (YWK) VOR/DME

A United Airlines Boeing 787-9 (N35953/UAL968) on a flight from San Francisco Intl, CA (KSFO) to Amsterdam, Netherlands (EHAM) declared an emergency due to a pressurization issue and was cleared to Bangor, ME (KBGR). The flight landed at 0516Z.
Update TSB Report #A19A0082: N35953, a Boeing 787-9 aircraft operated by United Airlines, was conducting flight UAL968 from San Francisco Intl (KSFO), CA to Amsterdam/Schiphol (EHAM), Netherlands. During cruise flight near Wabush (CYWK), NL at FL390, the crew was alerted to decreasing cabin altitude and noted that the right DC electrical bus had failed along with the right air conditioning pack. The left pack subsequently failed, and the crew declared an emergency, descended, and coordinated with ATS to divert to Bangor Intl (KBGR), ME.

September 21, 2019

Incident at 4819N / 06849W

An Air Canada Boeing 787-9 (C-FRSR/ACA848) on a flight from Toronto/Lester b. Pearson Intl, ON (CYYZ) to London/Heathrow Intl, UK (EGLL) reported a green laser strike at FL390.

February 2, 2019

Incident at 4217N / 06630W (ELT)

A British Airways Airbus A318 (BAW2) from New York/John F. Kennedy Intl, NY (KJFK) to London City, UK (EGLC) reported an intermittent emergency locator transmitter (ELT) signal at FL390. The Joint Rescue Coordination Centre (JRCC) Halifax was advised.

January 21, 2019

Incident at 5222N / 06342W

A K.L.M. Royal Dutch Airlines Boeing 787-9 (KLM282) from San Francisco Intl Airport, CA (KSFO) to Amsterdam Airport Schiphol, Netherlands (EHAM) reported severe turbulence at FL390 and requested to climb to FL400. They did not report any injuries and there was no delay in service.

January 10, 2019

Incident at 4945N / 05100W

At 1435Z, a British Airways Boeing 777 200 (G-RAES/BAW29G) from Boston Intl Airport, MA (KBOS) to Heathrow Airport, UK (EGLL) executed contingency procedures and descended from FL390 to FL360 without a clearance due to severe turbulence. No traffic.

November 29, 2018

Incident at 4845N / 06134W

A KLM Boeing 787-9 (KLM254) from Atlanta Intl Airport, GA (KATL) to Amsterdam Airport, Netherlands (EHAM) reported moderate/severe turbulence at FL370. It requested immediate climb to FL390.

July 29, 2018

Incident at 5640N / 12255W

An Air China Cessna 560 Citation V (CA999) from Fort Nelson, BC (CYYE) to Vancouver Int'l, BC (CYVR) filed FL370, the air traffic controller (ATC) cleared FL370, the pilot read back FL370. ATC observed flight climbing through FL376, and queried pilot. The pilot acknowledged climbing to FL390. ATC gave clearance to FL390. Pilot acknowledged error. No loss of separation or other operational impact on other aircraft.

May 24, 2018

Incident at 5201N / 11739W (ELT)

A strong emergency locator transmitter (ELT) signal was heard for 4 minutes by a WestJet Boeing 737-600 (WJA180) from Vancouver Int'l, BC (CYVR) to Edmonton Int'l, AB (CYEG) at FL390. Victoria Joint Rescue Coordination Centre (JRCC) advised.

August 30, 2018

Incident at 115NM E TORONTO / LESTER B. PEARSON INTL ON (CYYZ) (Communication navigation surveillance/air traffic system)

Update TSB Report # A18O0126: C-FGWJ, a Boeing 737-700 aircraft operated by WestJet, was conducting flight WJA328 from Toronto/Lester B. Pearson Intl, ON (CYYZ) to St. John?s Intl, NL (CYYT). Some time after the departure, the flight crew was instructed by ATC to climb to FL390. During the climb, a loss of separation occurred between WJA328 and DAL2790, an Airbus 320 aircraft operated by Delta Airlines who was conducting a flight from Boston/General Edward Lawrence Logan Intl, MA (KBOS) to Minneapolis-St. Paul Intl/Wold-Chamberlain, MN (KMSP) at FL360. The separation between the two aircraft reduced to 4.7 nm laterally and 600 feet vertically, in airspace where 5 nm or 1000 feet is required.
A WestJet Boeing 737-7CT (C-FGWJ/WJA328) from Toronto/Lester B. Pearson Int'l, ON (CYYZ) to St. John's Int'l, NL (CYYT) was instructed to climb to FL390 and passed a Delta Air Lines Airbus A320 (N359NW/DAL2790) from Boston Int'l, MA (KBOS) to Minneapolis/St. Paul Int'l, MN (KMSP) level at FL360, with less than required separation.

October 22, 2018

Incident at Seattle

TSB #A18F0249: C-FMPN, an Embraer EMB-505 300 Phenom aircraft operated by Aurora Jet Partners, was conducting a flight from Vancouver Intl (CYVR), BC, to Scottsdale (KSDL), AZ with 2 crew members and 2 passengers on board. During the climb from FL390 to FL410 south of the SEA VOR, the flight crew was alerted to multiple BATT EXCEEDANCE CAS messages that remained on briefly, and then extinguished. The messages appeared for a third time, and remained on. The flight crew requested a diversion to Yakima Air Terminal/McAllister Field (KYKM), WA, and declared a PAN PAN. A normal approach and landing on Runway 27 was conducted at KYKM without further incident, with ARFF standing by. As a precaution, ARFF scanned both aircraft batteries with a Thermal Imaging Camera (TIC), and no abnormal heat signatures were detected. Maintenance personnel replaced the number 1 Starter/Generator and the number 1 Generator Control Unit. Function tests were completed with no faults found and the aircraft was returned to service.

June 19, 2018

Incident at DISOR

TSB #A18F0133: C-FEAK, a Boeing 737-800 aircraft operated by Sunwing Airlines on behalf of TUI Airways, was conducting flight TOM370 from Leeds/Bradford Intl, UK (EGNM) to Dalaman, Turkey (LTBS). Approximately 3 hours into the flight within the Macedonia FIR at FL370, the flight crew was unable to make FL390 within the cleared time limit and leveled off at FL380. ATC instructed the aircraft to turn right 5 degrees, and on the new heading, TOM370 received a "Climb" RA. TOM370 complied with the RA and advised ATC.

May 16, 2018

Incident at 5300N / 00040W

An American corporately registered Raytheon Aircraft Company hawker 800XP (N535RV) from St. John's, NL (CYYT) to Brussels, Belgium (EBBR) climbed from FL350 to FL390 without clearance. The pilot advised they inadvertently followed the flight plan and not the Air Traffic Control (ATC) clearance. No traffic.

May 2, 2018

Incident at 245NM N ARTURO MERINO BENÍTEZ INTL (SCEL)

TSB Report #A18F0088: C-FVLX, a Boeing 787-9 aircraft operated by Air Canada, was conducting flight ACA92 from Toronto/Lester B. Pearson Intl, ON (CYYZ) to Santiago/Arturo Merino Benítez Intl, Chile (SCEL) with 11 crew members and 208 passengers on board. When the aircraft was cruising at FL390 approximately 245 nautical miles North of SCEL, a passenger in the forward section of the aircraft inadvertently drop a cellular phone down inside the seat mechanism. Despite guidance to passengers on how to address this type of situation, the seat was moved by the passenger which caused damage to phone. Smoke was then observed in the cabin, however there was no fire. The cabin crew was able to retrieve the device and placed it in a Portable Electronic Device Fire bag. The flight continued to destination without further incident. The seat area was inspected and no damage was found. The area was cleaned and the aircraft was returned to service.

March 24, 2018

Incident at SAULT STE MARIE MI (SSM) VOR/DME (ELT)

Reports of an emergency locator transmitter (ELT) signal in the vicinity of SSM from numerous aircraft from FL270 to FL390. Signal reported as strong. Trenton Joint Rescue Coordination Centre (JRCC) advised. No further reports after 0115Z. No operational impact.

February 1, 2018

Incident at 670NM NNW IXTAPA, MEXICO (MMZH)

TSB Report#A18F0042: C-FWGH, a Boeing 737-800 aircraft operated by Sunwing Airlines, was conducting flight SWG481 from Vancouver Intl, BC (CYVR) to Ixtapa/ Zihuatanejo Intl, Mexico (MMZH) with 143 passengers and 7 crew members on board. During cruise flight at FL370 shortly after passing the Delicias (DEL) VOR on Airway UJ27, the flight was cleared to climb to FL390. Approaching FL380, ATC instructed SWG481 to level off at FL380. Shortly thereafter, the flight crew received a TCAS TA, followed by an RA to "Climb". The flight crew complied with the RA and advised ATC. The flight was immediately re-cleared to FL390, and continued to destination without further incident.

January 21, 2018

Incident at 52NM BUFFALO NY (BUF) VOR/DME

An Air Canada Rouge Airbus A319 (ROU1731) on a flight from Saint Kitts (TKPK) to Toronto/Lester B. Pearson, ON (CYYZ) declared a PAN PAN due to a hydraulic failure while enroute to CYYZ. The aircraft subsequently declared an emergency on initial contact with YZ centre. The aircraft landed Runway 33R at 0325Z without incident.
UPDATE: TSB Report#A18F0009: C-FYJG, an Airbus 319-114 aircraft operated by Air Canada rouge, was conducting flight ROU1731 from Basseterre/Robert L. Bradshaw Intl., Saint Kitts and Nevis (TKPK) to Toronto/Lester B. Pearson Intl., ON (CYYZ) with 5 crew members and 105 passengers on board. During cruise, at FL390 the flight crew reported a failure associated with the hydraulic system. The crew declared a PAN PAN, then upgraded to a MAYDAY. ROU1731 subsequently landed without incident. The operator's maintenance inspected the aircraft and identified the check valve of the green hydraulic system leaking. Associated parts were replaced, and the aircraft returned to service.

May 7, 2018

Incident at 4828N / 06713W

A Norwegian Air Shuttle Boeing 787-8 (NAX7001) from Oslo, Norway (ENGM) to New York, NY (KJFK) reported moderate to severe turbulence at FL390. The aircraft descended to FL360 and experienced the same turbulence down to FL370.

March 7, 2018

Incident at 5506N / 09745W

A Fast Air Israel 1124 (PBR125) from Thompson, MB (CYTH) to Winnipeg/James Armstrong Richardson, MB (CYWG) lost auto pilot on its climb out of CYTH and was no longer reduced vertical separation minimum (RVSM) capable. The aircraft continued to climb to FL390. No impact to operations.

November 25, 2018

Incident at 4600N / 05800W

A Jet Aviation Flight Services Gulfstream G-VI (JAS61) from Newark International, NJ (KEWR) to King Khalid International, Saudi Arabia (OERK) reported severe turbulence at FL350. The aircraft climbed to FL390.

November 22, 2018

Incident at 4850N / 03104W

At 0644Z, Aircraft Detection System (ADS) reports indicated that a Virgin Atlantic Airways Boeing 747-400 (GVBIG/VIR16A) from Orlando Intl, FL (KMCO) to Gatwick, UK (EGKK) was descending from FL390. VIR16A reported with Shanwick Oceanic (EGGX) that they descended to FL370 due to severe turbulence.

November 9, 2018

Incident at 4823N / 06600W

A Turkish Airlines Airbus A330-300 (THY81D) from Istanbul Atatürk, Turkey (LTBA) to Boston, MA (KBOS) reported moderate to severe turbulence at FL390. The aircraft descended to FL340. The Halifax (HZ) flight information centre (FIC) was advised.

November 3, 2018

Incident at 4905N / 43490W

A Norwegian Air UK Ltd. Boeing 787-9 (LNLNN/NRS7148) from Boston Intl Airport, MA (KBOS) to Gatwick Airport, UK (EGKK), at 0507Z and at coordinates of N49 05 W434 90, was flying at a flight level of FL390 when the aircraft encountered severe turbulence and descended to FL370 without clearance.

October 28, 2018

Incident at 50NM STEPHENVILLE NL (YJT) VOR/DME

An American corporately registered Boeing 737 7HJ (N737AT) from Portsmouth Int'l Airport, NH (KPSM) to Zurich Airport, Switzerland (LSZH) requested, and received, climb from FL370 to FL390. The aircraft was then observed descending from FL387 without clearance. No loss of separation.

October 13, 2018

Incident at 4557N / 05926W

A Swiss International Air Lines Ltd. Airbus A330-300 (SWR15X) from New York/John F. Kennedy International, NY (KJFK) to Zurich, Switzerland (LSZH) and a Transportes Aereos Portugueses, S.A. Airbus A330-200 (TAP214) from Newark International, NJ (KEWR) to Francisco Sá Carneiro, Portugal (LPPR) reported experiencing moderate to severe turbulence. SWR15X was at FL370 and climbed to FL390. TAP214 was at FL350 and descended to FL290. The Halifax Flight Information Centre (HZ FIC) was notified.

October 1, 2018

Incident at MONCTON CENTRE / ACC DE MONCTON

A Meridiana Fly S.P.A. Airbus A330-200 (ISS901) from Milan/Malpensa Airport, Italy (LIMC) to New York, NY (KJFJ) reported moderate to severe turbulence at FL390. Aircraft descended to FL340.

September 27, 2018

Incident at 4724N / 06053W

A Meridiana Fly S.P.A. Airbus A330-202 (EI-GGO/ISS904) from Miami Intl Airport, FL (KMIA) to Milan/Malpensa Airport, Italy (LIMC) reported moderate to severe turbulence at FL390. The aircraft descended to FL370. Halifax Intl (CYHZ) flight information centre (FIC) advised.
Correction: An Air Italy S.P.A. Airbus A330-203 (EI-GGO/ISS904) from Miami Intl Airport, FL (KMIA) to Milan/Malpensa Airport, Italy (LIMC)...

July 6, 2018

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

NY Ocean called to query about a target, a Thomas Cook Airlines Ltd. Airbus A330-300 (OYVKG/TCX2650) from Glasgow International, UK (EGPF) to Orlando International, FL (KMCO) over the JEBBY intersection at FL390. The estimate had not been passed. There was no loss of separation, and no operational impact.

July 17, 2018

Incident at GANDER CENTRE / ACC DE GANDER

An Air France Boeing 777 200 (FGSPJ/AFR4085) from Seattle-Tacoma Int'l, WA (KSEA) to Paris/Charles de Gaulle, France (LFPG) was initially issued an Oceanic Clearance at FL390 and was coordinated with Reykjavik Centre. Subsequently the flight advised it was not able to fly FL390, a revised clearance was issued at FL380 with a routing change. The route amendment was coordinated with Reykjavik but the altitude change was not.

July 12, 2018

Incident at 4500n / 06400w

UPDATE to aircraft information: An Aviation Safety Program Analyst looked into this occurrence and the aircraft operator in the aircraft information and the narrative was changed from "A Meridiana Fly Airbus A330-200 (ISS904)..." to "An Air Italy Airbus A330-200 (ISS904)...".
A Meridiana Fly Airbus A330-200 (ISS904) from Miami Int'l, FL (KMIA) to Milan, Italy (LIMC) reported severe turbulence at FL390. The aircraft descended to FL380. No impact to operations.

June 17, 2018

Incident at JOOPY intersection

A KLM Royal Dutch Airllines Airbus A330-200 (KLM672) from Montreal/Pierre Elliott Trudeau Int'l, QC (CYUL) to Amsterdam/Schiphol, Netherlands (EHAM) climbed from FL390 to FL400 without clearance. There was no traffic, so safety was not jeopardized.

May 16, 2018

Incident at 4636N / 05810W

Severe turbulence at FL410 reported by a Gestair S.A. Gulfstream Aerospace Gulfstream 5 G-1159D (GES251) from Detroit Metro/Wayne County, MI (KDTW) to Madrid/Bajaras, Spain (LEMD) descended to FL390. Halifax (HZ) Flight Information Centre (FIC) was advised.

May 19, 2018

Incident at 4824N / 04337W

At 0050Z, an Air Canada Airbus A330-343 (ACA846) from Toronto/Lester B. Pearson Int'l, ON (CYYZ) requested a diversion to St. John's Int'l, NL (CYYT) due to an unruly passenger. Flight was advised unable to give IFR clearance at FL390 due to Predicted Conflict Alert ? Traffic (TFC) however clearance was available at FL310. Flight descended to FL275 on its own before climbing back to FL310. ACA846 was then issued clearance right turn direct CYYT. The aircraft landed at CYYT without incident at 0223Z.

May 8, 2018

Incident at 4640N / 06323W

A Transportes Aereos Portugueses Airbus A330-200 (CSTOK/TAP259) from Lisbon, Portugal (LPPT) to Toronto/Lester B. Pearson Int'l, ON (CYYZ) reported moderate to severe turbulence at FL390 and descended to FL380. No injuries reported nor damage to the aircraft. Halifax (YHZ) Flight Information Centre (FIC) notified all.

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