February 23, 2020


A Northern Thunderbird Air Inc. Beech B300 (C-FNTA/NTA201) from Fort St. John, BC (CYXJ) to Vancouver, BC (CYVR) reported a loss of pressurization. Descended from FL270 to 110 and elected to land at Prince George, BC (CYXS) instead of proceeding to CYVR. No operational impact. (Additional information merged from duplicate AOR-262082-V1, record deleted)
Update TSB Report #A20P0030: C-FNTA, a Beech King Air 300 operating as flight NTA201, operated by Northern Thunderbird Air, was on a MEDEVAC flight from Fort St. John (CYXJ) BC, to Vancouver International Airport (CYVR), BC. During cruise, at 27 000 feet, approximately 80nm North of Prince George (CYXS), BC, the aircraft experienced a rapid decompression. The flight crew initiated a descent and donned their oxygen masks while completing the emergency checklist. The crew then declared an emergency with ATC and leveled off at 11 000 feet. The aircraft diverted to CYXS and landed without further incident or injuries. Maintenance found that the door seal was leaking and worn. The seal was replaced and the aircraft was returned to service.

March 5, 2020


TSB Report #A20O0033: The Sunwing Airlines Boeing 737-800 aircraft (SWG374, C-FJVE) was on climb out from Sault Ste. Marie (CYAM), when the flight crew received a Fuel Imbalance Alert for the right tank. The flight crew declared a PAN PAN and the aircraft levelled off at FL270. The crew initiated the fuel imbalance checklist and determined that the Crossfeed Valve was open. The checklist was completed and the fuel was allowed to balance the loads in the tanks. The flight continued to destination without further faults.

February 9, 2020

Incident at In the vicinity of: PASKE

TSB Report #A20F0032: C-FNJZ, a CRJ 900 operated by Jazz Aviation LP was conducting flight AC8670 from Vancouver Intl. (CYVR), BC to San Diego Intl. (KSAN), CA. While on top at FL270 Vicinity of PASKE (Porter, CA), the crew encountered clear air turbulence. Airspeed fluctuated +/-30kts but did not over-speed nor did the Auto Pilot kick off. Turbulence and Ignition buttons were on. The turbulence made reading the instruments on the panel impossible as they were too blurry. The motion was up/down as well as side/side. The seat belt signs were switched on about 2 min prior to the encounter. Flight crew initiated descent to FL 250 where they had moderate to borderline severe turbulence. Continuing descent to FL230 flight encountered a severe turbulence event that lasted approximately 5 minutes. Flight climbed to FL250 where the turbulent event ceased. Maintenance is arranging for an inspection.

June 9, 2020

Incident at 6000N / 04800W

An automatic dependent surveillance – broadcast (ADS-B) report indicated that an American, corporately registered Piper PA-46-500TP (N392MA) from Goose Bay, NL (CYYR) to Narsarsuaq, Greenland (BGBW) was descending from FL270 without a clearance. The aircraft was cleared to maintain FL240. The flight was subsequently cleared to descend out of controlled airspace. No traffic or impact to operations.

November 17, 2019

Incident at S OBRET intersection

During initial contact with the lower-level sector, a Bombardier Inc. Bombardier BD-700-1A10 (C-GFQR/BBA34) from Montreal/Pierre Elliott Trudeau Intl, QC (CYUL) to Montreal/Pierre Elliott Trudeau Intl, QC (CYUL) reported that it was descending to FL270, even though it had received and read back clearance from the upper-level sector to descend to FL290. No loss of separation and no impact on operations.

November 4, 2019


An Airsprint Inc. Cessna 525A (C-FASR/ASP524) on a flight from Montreal/Pierre Elliott Trudeau Intl, QC (CYUL) to Fredericton Intl, NB (CYFC) reported having lost reduced vertical separation minimum (RVSM) capability during enroute climb due to autopilot malfunction. Initially having filed FL330 as a requested cruising altitude, ASP524 revised the requested altitude to FL270. The aircraft was subsequently cleared as requested. No impact on operations.

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.

June 16, 2019


An Air Transat aircraft, make and model unknown (TSC267+), origin and destination unknown, was given and read back FL290 by the LE sector. TSC267+ checked in with the GR sector while descending to FL270. No impact on operations, aircraft was still at FL360 during the check-in.

July 11, 2019

Incident at KILLALOE ON VOR/DME (YXI) (ATS operating irregularity)

A Jazz Bombardier CL-600-2B19 (Series 200) (JZA8660) from London, ON (CYXU) to Ottawa/Macdonald-Cartier, ON (CYOW) was instructed by air traffic control (ATC) to descend from FL310 to FL240. Aircraft came within close proximity of another aircraft, an Air Canada Embraer ERJ 190-100 IGW (ACA458) from Toronto/Pearson, ON (CYYZ) to Ottawa/Macdonald-Cartier, ON (CYOW), that was holding at FL270. Instruction was meant for a Jazz Bombardier CL-600-2D24 (Series 900) (JZA8016) from Saskatoon/Diefenbaker, SK (CYXE) to Ottawa/Macdonald-Cartier, ON (CYOW).

November 18, 2019

Incident at KLCQ - Lake City Gateway - Lake City

TSB Report #A19F0294: C-GEZX, an Airbus A321-211 was operating as flight Air Transat TSC90D from Lake City Gateway (KLCQ), FL to Montreal/Pierre Elliott Trudeau (CYUL), QB. While on climb at FL270, flight crew noted left hand engine low oil quantity advisory. The flight crew leveled off for troubleshooting at which point they observed left hand engine oil pressure fluctuation and higher than normal engine temperature. The flight crew declared a PAN PAN with ATC, requested a return to land at KLCQ and kept faulty engine at idle until landing. The engine was shut down by flight crew after a safe landing at KLCQ. Inspection was conducted by emergency services once on the ground and oil was observed coming out of the left hand engine. After inspection, flight crew taxied the aircraft to the ramp. Maintenance found gearbox turning tool access cover loose and leaking oil.

January 27, 2019


TSB Report #A19F0024: C-FTVF, a Boeing 737-800 aircraft operated by Air Transat, was conducting flight TSC447 from Holguin/Frank País Intl (MUHG), Cuba to Toronto/Lester B. Pearson Intl (CYYZ), ON with 6 crew members and 183 passengers on board. During cruise flight at FL290, approximately 90 nm east-southeast of Pittsburgh Intl (KPIT), PA, the flight encountered severe turbulence for approximately 30 seconds. Altitude and pitch variations were minor. Speed variations were +/- 10 kts, and the aircraft experienced rolls of approximately 30° that were managed by the auto-pilot. The flight crew requested and was authorized to FL270, and the aircraft continued to destination without further incident. There were no injuries. The operator’s maintenance inspected the aircraft in accordance with the Aircraft Maintenance Manual (AMM). No defects were found, and the aircraft was returned to service.

July 29, 2019

Incident at 5537N / 11635W

A Canadian Western Airlines Beech 200 (CWA928-M) from Peace River, AB (CYPE) to Edmonton, AB (CYEG) was cleared to FL250 and was observed climbing through FL256. Aircraft was re-cleared to FL270. No impact to operations.

April 28, 2019


An Anderson Air Ltd. Cessna 680 (C-GTOG) from Santa Barbara, CA (KSBA) to Saskatoon/John G. Diefenbaker Intl, SK (CYXE) was given and read back a descent to FL380. The aircraft was subsequently observed on radar descending below FL369. The pilot was queried and agreed the clearance was to FL380. The controller cleared the aircraft further to FL270; no impact to operations.

January 29, 2019


A Flair Airlines Ltd. Boeing 737-800 (FLE809) from Winnipeg/Richardson Intl, MB (CYWG) to Miami Intl, FL (KMIA) declared an emergency (PAN PAN) after shutting down an engine and requesting to return to CYWG. FLE809 landed on Runway 36 without further incident at 1628Z.
Update TSB Report #A19F0044: OK-TSS, a Boeing 737-800 aircraft operated by Smartwings on behalf of Flair Airlines, was conducting flight FLE809 from Winnipeg/James Armstrong Richardson Intl (CYWG), MB to Miami Intl (KMIA), FL with 6 crew members and 63 passengers on board. During the climb after the departure from CYWG, the flight crew noticed a low oil pressure indication on the number 1 engine (CFM56-7B27). The Non-Normal Checklist (NNC) was executed as per the Quick Reference Handbook (QRH) and, after passing FL270 in the climb, the flight crew shut the number 1 engine down and declared a PAN PAN. The aircraft returned to CYWG and landed without further incident. Maintenance personnel carried out an inspection and found an internal oil leak within the engine. The engine was replaced, and the aircraft was returned to service.

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.

October 1, 2018

Incident at 30NM SE LONDON ON (CYXU)

TSB #A18O0137: C-FWRR, a Bombardier CL-600-2B19 (CRJ100) aircraft operated by Air Georgian, was conducting flight GGN7335 from Toronto/Lester B. Pearson Intl (CYYZ), ON to Nashville Intl (KBNA), TN. As the aircraft was climbing through FL270 in the vicinity of London (CYXU), ON, the flight crew received a CABIN ALT master caution message. The flight crew noted that the cabin altitude was at 8500 feet, and requested an immediate descent to 10 000 feet. However, the cabin altitude continued to increase to 10 000 feet, and the CABIN ALT master warning light illuminated. The flight crew donned their oxygen masks, and continued the emergency descent to 10 000 feet as per SOPs. The airspeed was reduced to 250 KIAS, and QRH procedures were followed. The decision was made to continue to destination, and the aircraft subsequently landed uneventfully at KNBA. The operator’s maintenance found the R/H pack duct blown out and deferred it as per MEL procedures. The L/H pack was checked and found to be operational. Part of the follow up actions included the replacement of the duct, as well as the duct check valve. The operator issued an SDR for the duct check valve.

June 11, 2018

Incident at DARID intersection

An Air Canada Airbus A320 (ACA542) from Seattle-Tacoma Int'l, WA (KSEA) to Toronto/Lester B. Pearson Int'l, ON (CYYZ) was given a FL270 or below crossing restriction 25NM north of DARID which was read back. ACA542 began their descent too late in order to make the restriction and advised they would only be able to make FL320. The controller turned ACA542 as a result. There were no conflicts or operational impact.

April 2, 2018


An Air Canada Airbus A320 (ACA413) en route from Montreal/Pierre Elliott Trudeau Int'l, QC (CYUL) to Toronto/Lester B. Pearson Int'l, ON (CYYZ) reported a strong emergency locator transmitter (ELT) signal descending through FL290-FL270 over Peterborough, ON (CYPQ). No other reports. No operational impact.

May 1, 2018

Incident at 4800N / 04806W

A Lufthansa Airbus A330-300 (D-AIKC/DLH415) from Washington-Dulles Intl Airport, VA (KIAD) to Munich, Germany (EDDM) declared a medical emergency, initiated contingency procedures, descended to FL270 and requested to divert to St. Johns Intl, NL (CYYT). Upon reaching FL270, the aircraft was cleared as requested.

March 24, 2018


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.

March 12, 2018

Incident at 4414N / 07155W

A Jazz Bombardier CL-600-2B19 (C-GJZZ/JZA8462) from Montreal/Pierre Elliott Trudeau, QC (CYUL) to Boston Intl., MA (KBOS) declared an emergency due to a flight control issue. Emergency vehicles were deployed. The aircraft landed without incident at 2358Z. No impact on operations.
UPDATE from Airworthiness: A Civil Aviation Safety Inspector (CASI) looked into this occurrence. While in cruise, the Flight Crew experienced airframe buffeting. The aircraft?s speed was reduced and the buffeting dissipated. A PAN PAN declaration was made. The aircraft returned and landed a few minutes later without further incident. Upon arrival, the aircraft was removed from service. During completion of required Aircraft Maintenance Manual (AMM) abnormal occurrence inspection, the left upper horizontal stabilizer visor was found slightly loose with minor damage to the Teflon rub strip. The visor assembly was replaced and the aircraft released to service. Deteriorated sealant was also observed at the front of the wing-fuselage aerodynamic fairings, and new sealant was applied.
UPDATE TSB Report #A18F0056: C-GJZZ, a Bombardier CL-600-2B19 (CRJ200) aircraft operated by Jazz Aviation LP, was conducting flight JZA8462 from Montreal/Pierre Elliott Trudeau Intl, QC (CYUL) to Boston/General Edward Lawrence Logan Intl, MA (KBOS) with 3 crew members and 29 passengers on board. During cruise with the autopilot on, the flight crew reported airframe buffeting at FL270 and operating at an airspeed of 300 knots. No anomalies were reported with the engines or the flight controls. The flight crew declared a PAN PAN and elected to return to CYUL. The flight landed uneventfully.

October 4, 2018


A Government Of Canada, Department Of National Defence aircraft (SNPR03) on a flight from Calgary International, AB (CYYC) departed with a clearance to FL210. The aircraft checked in with the enroute controller while climbing through FL210 for FL270. No impact to operations.

June 13, 2018

Incident at 5028N / 11545W

A 318447 Alberta Ltd. Socata TBM 700 (Series N) (C-FDLE) from Kelowna, BC (CYLW) to Calgary/Springbank, AB (CYBW) commenced descent from FL270 without clearance. Controller issued correction and aircraft climbed back up to FL270. No impact on operations.

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.

November 14, 2018

Incident at 4827N / 05802W

A United Airlines Boeing 777-200 (UAL82) from Newark International, NJ (KEWR) to Indira Gandhi International, India (VIDP) reported severe turbulence. The aircraft descended from FL290 to FL270. No issues were reported by the crew. No impact to operations.

December 7, 2017


A Chrono Aviation Pilatus PC-12/45 (C-GICR/NDL876) on a flight from Pourvoirie Mirage, QC (CPM3) to Montreal/St-Hubert, QC (CYHU) was cleared to FL260 and was observed on the radar at FL270. No loss of separation. No impact on operations.

July 30, 2017

Incident at ALKOB intersection

On route to Teterboro (KTEB), NJ, a Gulfstream IV operated by Pegasus Elite Aviation (PEG13), flying from Bromley (EGKB), England, to Teterboro (KTEB), NJ, reported that its windscreen was cracked. No emergency declared. The aircraft continued its normal flight, but at FL270. No impact.

May 2, 2017

Incident at CYR603 (Communication navigation surveillance/air traffic system)

From May 2 to 5, 2017, the military unit at Valcartier, QC, activated an extension of special use airspace CYR603, above 17 000 ft (surface to FL270), between 1400Z and 2230Z, without ensuring the required coordination beforehand. During those four days, 10 aircraft entered CYR603.

May 25, 2017

Incident at PRINCE GEORGE BC (CYXS) (Communication navigation surveillance/air traffic system)

A Central Mountain Air Dornier 328-100 (C-FCMG/GLR758) on a flight from Prince George, BC (CYXS) to Vancouver, BC (CYVR) on initial contact with the area control centre (ACC) was climbing out of CYXS. The aircraft was given a climb to FL270 and read back FL280. The error was not caught by the controller and the aircraft reached FL280 aprox 20 minutes later and then the error was detected. No impact to operations.

March 25, 2017


After leveling off at FL260, a Republic Airlines Inc. Embraer EMB-175 (N724XX/RPA3601) from Ottawa/MacDonald-Cartier, ON (CYOW) to Newark, NJ (KEWR) descended to FL256 in response to a traffic alert and collision avoidance system (TCAS) warning due to a United Parcel Service Co. Airbus A300B4 605R (N146UP/UPS474) from Louisville, KY (KSDF) to Montreal/Mirabel, QC (CYMX) who was authorized to descend to FL270. Traffic was passed to both aircraft. No impact on operations.

March 5, 2017


A Chrono Aviation Pilatus PC-12/45 (NDL765) from Toronto, ON (CYYZ) to Trois-Rivieres, QC (CYRQ), departing CYYZ, received clearance to 7000 and the aircraft read back 7000 feet. The aircraft was observed climbing through 7400 feet, SD controller queried the aircraft on clearance. NDL765 indicated climbing to FL270. Controller re-cleared the aircraft to 8000 feet. The aircraft was observed climbing to 8400 before returning to 8000 feet. No operational impact.

January 21, 2017

Incident at In the vicinity of: SASUT intersection

An Air Canada Airbus A321-211 (ACA109) from Toronto, ON (CYYZ) to Vancouver, BC (CYVR) was instructed to climb to FL270; read back FL270 and when checking in on the next frequency reported climbing to FL320.

September 30, 2017

Accident at 6137N / 04723W (FOD (foreign object debris), Aerodrome, runway or taxiway shutdown)

UPDATE: TSB Report#A17A0063: F-HPJE, an Airbus 380-800 aircraft operated by Air France, was conducting flight AFR066 from Paris/Charles de Gaulle, France (LFPG) to Los Angeles Intl, CA (KLAX) with 24 crew members and 497 passengers on board. At 1349 UTC while in cruise at FL370, the flight crew declared a MAYDAY when fan and inlet components of the number 4 engine (Engine Alliance GP7270) separated from the engine. The flight crew shut the engine down and diverted to Goose Bay, NL (CYYR) where a landing was carried out without further incident on Runway 26 at 1543 UTC with ARFF standing by. Substantial damage to the number 4 engine inlet section was visible, as well as visible damage to slats and fairings inboard and outboard of the number 4 engine. A runway inspection discovered debris on the arrival runway, which needed to be removed before the runway could be reopened. The Transportation Safety Board (TSB) of Canada, Bureau d'Enquêtes et d'Analyses (BEA) of France, and the National Transportation Safety Board (NTSB) of the USA deployed investigators to CYYR. Advisors from Air France, Airbus and Engine Alliance (specialists from Pratt & Whitney USA and General Electric) also travelled to CYYR to assist. The Flight Data Recorder (FDR) information was used to confirm the area of the engine fan separation to be approximately 150 kilometers southeast of Paamiut, Greenland (territory of Denmark). Danish authorities delegated the investigation to the BEA.
An Air France Airbus A380-800 (FHPJE/AFR066) on a flight from Paris, France (LFPG) to Los Angeles, CA (KLAX) reported fire in the number 4 engine. The engine was shut down. The aircraft offset 15 miles left and descended to FL310. The flight was re-cleared to FL270 direct to Goose Bay, NL (CYYR). The aircraft landed without incident at 1543Z.

May 31, 2017

Incident at In the vicinity of: CLEVELAND, MI

TSB REPORT#A17F0130: C-FTDW, a Boeing 737-800 aircraft operated by Sunwing Airlines, was conducting flight SWG516 from Cancún Intl, Mexico (MMUN) to Toronto/Lester B. Pearson Intl, ON (CYYZ). During the descent while in the Cleveland Center ARTCC (KZOB), the flight was cleared to FL280. ATC notified the flight crew that a Falcon Jet was climbing, but it was restricted to FL270. Initially, a TCAS Traffic Advisory (TA) was received and the flight crew confirmed on the TCAS display; however, there was no visual contact. Subsequently, a TCAS Resolution Advisory (RA) to CLIMB was received. The flight crew complied with the RA and reached an altitude of 28 400 feet before a LEVEL OFF command was received, followed by CLEAR OF CONFLICT. The flight continued to CYYZ without further incident.

April 7, 2017

Incident at Charlotte International Airport, NC (KCLT)

FAA Report: The pilot of Air Georgian Bombardier CL-600 2B19 (GGN7347) on route from Charlotte, NC (KCLT) to Toronto, ON (CYYZ) declared an emergency due to an open door indication and elected to return to Charlotte, NC (KCLT). The aircraft landed safely.
UPDATE: TSB REPORT#A17F0088: C-GKEK, a Bombardier CL-600-2B19 (CRJ200) aircraft operated by Air Georgian, was conducting flight GGN7347 from Charlotte/Douglas Intl, NC (KCLT) to Toronto/Lester B. Pearson Intl, ON (CYYZ). During the climb to cruising altitude after departure from KCLT, the flight crew received a PAX DOOR OUT HNDL warning message when going through FL270. The QRH was consulted and a return to KCLT was executed. The flight crew declared a PAN PAN and the flight landed back in KCLT without further event. Upon touchdown, a cabin crew member noticed that the lower right passenger door alignment mark was not aligned properly. The passenger door handle was deferred as per MEL 52-70-01-1. After returning to CYYZ, the operator?s maintenance discovered that the spring strut required adjustment with the flap ventilation door.

November 7, 2017


At FL270, a NAV CANADA Bombardier CL-600 2B19 (NVC201) on a flight from Inuvik, NT (CYEV) and landing at Inuvik, NT (CYEV) at FL270 en route to Homan, NT (CYHI), called Edmonton radio through FL192 looking for approach clearance to CYHI but did not receive descent clearance out of high level airspace prior to the call. No impact to operations.

February 27, 2017

Incident at 70NM NE IQALUIT NU (CYFB)

After departing Iqaluit, NU (CYFB), a Keewatin Air Beech B200 (C-GYSR/KEW208) from CYFB to Qikiqtarjuaq, QC, (CYVM), was authorized and read back climbing to FL270. The aircraft transferred frequency to the Edmonton, AB, Regional Control Centre (ACC CZEG). Leaving FL262, and on initial contact with CZEG, the aircraft mentioned climbing to FL280. No impact on operations.

September 30, 2017


A United States Air Force McDonnell Douglas F-15 (TABOR33) from Seymour Johnson Air Force Base, NC (KGSB) declared emergency, reason unspecified, no immediate assistance required. TABOR33 and a United States Air Force McDonnell Douglas F-15 (TABOR34) from Seymour Johnson Air Force Base, NC (KGSB) left altitude reservation (ALTRV) request clearance to Westfield, MA (KBAF) at FL270. TABOR33 requested cables at KBAF, TABOR33 and TABOR34 left Flight Information Region (FIR) at 0959Z.

June 28, 2016

Incident at In the vicinity of: N484257 W1201233

A Cargojet Airways Boeing 767-35E (C-GUAJ / CJT572) from Vancouver, BC (CYVR) to Calgary, AB (CYYC) requested a deviation, due to weather, towards the MOLSON military airspace that was active up to 28,000 feet. CJT572 was at FL270 and unable to climb above FL270. The Vancouver East enroute controller provided CJT572 with left or right turn options to avoid MOLSON. The aircraft was slow to turn and came within 2.0 NM of the MOLSON airspace. CJT572 subsequently returned to CYVR due to fuel and landed safely at 0435Z.

December 24, 2016


An Air Canada Embraer ERJ 190-100 IGW (C-FHNL / ACA1119) from Toronto, ON (CYYZ) to Regina, SK (CYQR) requested to stop climb at FL270. ACA1119 declared PAN and elected to return to CYYZ but did not want equipment and could taxi to gate on own. ACA1119 landed Runway 15L at 0604Z without further incident.

December 23, 2016

Incident at TORONTO / LESTER B. PEARSON INTL ON (CYYZ) (Diversion)

TSB Report#A16O0183: C-FHNL, an Embraer ERJ 190 aircraft operated by Air Canada, was conducting flight ACA1119 from Toronto/LBPIA, ON (CYYZ) to Regina Intl, SK (CYQR). While climbing through FL270 after departure, the flight crew received an EICAS message DOOR SERV AFT OPEN. Initially, the cabin altitude was at 6 500 feet and climbing at 500 fpm, then it remained at 7 700 feet. The flight crew carried out the QRH checklist and declared a PAN PAN to get below 10 000 feet. The flight returned to CYYZ for an uneventful approach and landing. The operator?s maintenance removed the forward upper guide ramp as per AMM 53-23-25-001-A. Additionally, a sheared elastic pin was discovered and replaced, along with the flanged bushing. The forward upper guide was re-installed as per AMM 53-23-25-400-801-A. The aircraft was checked serviceable and returned to service.

December 19, 2016

Incident at In the vicinity of: OWEN SOUND / BILLY BISHOP REGIONAL ON (C (ELT)

WestJet (WJA658) reported an emergency locator transmitter (ELT) signal while descending through FL270, Southeast bound.

November 23, 2016

Incident at WIARTON ON (CYVV)

A 650584 Alberta Inc. Israel Astra SPX (C-FRJZ) from Hamilton, ON (CYHM) to Toronto, ON (CYYZ) doing aerial work was cleared to FL270 and read back FL270. The aircraft was observed on radar climbing to FL282 before returning to FL270. No operational impact.

May 3, 2016

Incident at In the vicinity of: DEBUM INTERSECTION

A Cargojet Airways Boeing 727 200 (CJT573) from Ottawa, ON (CYOW) to Hamilton, ON (CYHM), westbound in the vicinity of the DEBUM fix, reported severe turbulence from FL250 to FL270.

October 6, 2016

Incident at 100NM S CALGARY INTL AB (CYYC)

A WestJet Boeing 737 600 (WJA482) from Vancouver, BC (CYVR) to Winnipeg, MB (CYWG) advised they were non reduced vertical separation minimum (RVSM) due to loss of traffic alert and collision avoidance system (TCAS). WJA4842 was cleared down to FL270. No impact on operations.

September 13, 2016


At 1607Z, a Calm Air Aerospatiale ATR 42-300 (C-GDSS/CAV552) from Repulse Bay, NU (CYUT) to Rankin Inlet, NU (CYRT) reported having a traffic alert and collision avoidance system (TCAS) alert and conflict resolution with an Air Nunavut Beech 200 (C-GZYO/BFF201) from CYRT to Hall Beach, NU (CYUX). CAV552 was flying at FL220 when the TCAS advisory sounded. The pilot made a broadcast on 126.7 and no response was heard. At 1605Z, their TCAS indicated the target passing FL199. CAV552 made a right turn, to avoid the traffic and their conflict resolution sounded a climb alert. The pilot reported climbing to FL224-FL225. CAV552 was able to establish contact with BFF201 to confirm it was their aircraft that was in the vicinity and in a climb to FL250. The pilot of CAV552 reported no broadcasts heard on 126.7 prior to the conflict resolution. No impact on operations.
UPDATE TSB #A16C0105: C-GDSS, an ATR 42-300 aircraft operated by Calm Air, was conducting flight CAV552 from Repulse Bay, NU (CYUT) to Rankin Inlet, NU (CYRT). At approximately 47 nautical miles North East of CYRT and level at FL220 in uncontrolled airspace, the flight crew observed a TCAS advisory. The flight crew made a broadcast on 126.7 MHz stating their location; however, there was no response from the other aircraft. As the target passed through FL199, CAV552 started a right turn. Subsequently, a TCAS RA climb alert was issued and CAV552 initiated a climb through FL225 where the RA ceased. The flight crew noticed the traffic below their left wing and eventually established contact on 126.7 MHz with C-GZYO, a Beech King Air 200 operated by Air Nunavut as flight BFF201 from Rankin Inlet, NU (CYRT) to Hall Beach, NU (CYUX). BFF201 had been cleared by ATC to climb to FL270 into controlled airspace. While climbing through FL210, the flight crew observed CAV552 in the right turn. BFF201 had been in communication with ATC and did not hear CAV552's initial advisory on 126.7 MHz. C-GZYO was not equipped with a TCAS.

April 3, 2016

Incident at In the vicinity of: BEAVER CREEK YT (CYXQ)

A United States Air Force McDonnell Douglas KC-10 (HOIST90) from Eielson Air Force Base, Alaska (PAEI) to McGuire Field (Joint Base Mc Guire Dix Lakehurst) Wrightstown, NJ (KWRI) informed air traffic control (ATC) that they were unable to continue on flight plan. Aircraft turned back to PAEI and needed to descend to FL270. No emergency declared.

October 21, 2016

Incident at GOOSE BAY NL (CYYR)

UPDATE: Aviation Incident Report#14518: Goose Bay Airport (CYYR) reported a medical diversion involving a Norwegian Air Shuttle Boeing 787-9 (NAX76096) with an unconscious passenger.
A Norwegian Air Shuttle Boeing 787-9 (GCIXO/NAX7096) from Los Angeles, CA (KLAX) to London, England (EGKK), an eastbound oceanic flight routing 55N050W 56N040W, declared a medical emergency at 0840Z at position 5513N04612W. The aircraft carried out contingency lateral offset of 15nm and descended to FL270. Reaching FL270 the aircraft diverted to Goose Bay, NL (CYYR). The flight landed at 1012Z.
UPDATE: JRCC SARSUM Halifax Report: (543197N 0542834W - 210NM ENE of Goose Bay). Gander Centre reported that NAX7096, a Boeing B787 flying from Los Angeles, CA to London, England had a medical emergency on board and had returned to Goose Bay. The passenger that had lost consciousness. When the aircraft landed, Doctors on scene declared the patient deceased from an apparent cardiac event.

July 9, 2016


A Turkish Air Force Airbus A400M (TUAF807) from Burlington, NJ (KWRI) to Gander, NL (CYQX) declared Pan Pan and requested lower altitude. The pilot indicated that they lost the number one engine and requested FL270, not declaring an emergency. The aircraft was given descent to FL270 and they advised that no assistance was required and that they were continuing to their destination. Gander (QX) area control centre (ACC) and Joint Rescue Coordination Centre (JRCC) Halifax were advised. TUAF807 left Moncton, NB (QM) airspace at 0140Z. No impact to operations.

February 19, 2016


The Pilot of an Air Canada Airbus A320-211 (C-FTJS/ACA1216) from Halifax, NS (CYHZ) to Fort Lauderdale, FL (KFLL) informed air traffic control (ATC) that due to temperature indicator for landing gear it needed to be extended and speed reduced. 50NM west of CYHZ, the flight requested lower due to airspeed, and descended from FL270 to FL213. 80NM west of CYHZ, the problem was resolved and the flight proceeded normally. No impact to operations.