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.

April 24, 2020


A Skycare Air Ambulance Swearingen SA226-AT (C-GCPX) from Sioux Lookout, ON (CYXL) to Round Lake (Weagamow Lake), ON (CZRJ) was observed on radar at FL180 without clearance. When queried, the pilot descended to their cleared altitude of A170. No impact to operations.

February 18, 2020

Incident at 5516N / 11204W

A North Cariboo Flying Service Ltd. de Havilland DHC-8-311 (C-GLWN/NCB1791) from Primrose, AB (CFN6) to Edmonton, AB (CYEG) was cleared to FL180. Aircraft was observed climbing above FL180, and was subsequently cleared to FL240. No impact to operations.

November 11, 2019


A Sky Jet M.G. Beech 200 (C-GNBB/VSL445) on a MEDEVAC flight from La Romaine, QC (CTT5) to Sept-Îles, QC (CYZV) was seen on the radar at FL180 without having received clearance. No impact on operations.

October 27, 2019


A Nolinor Aviation Boeing 737-2B6C (C-GTUK/NRL637) from Rivière-aux-Saumons, QC (CTH7) to Montreal/Mirabel Intl, QC (CYMX) requested to stay at FL180 due to a broken windshield. The aircraft did not declare an emergency. No impact on operations.

June 24, 2019

Incident at SILVI intersection

A Royal Air Maroc Boeing 777-300 (A7BEC/RAM208) from Casablanca, Morocco (GMMN) to Montreal/Trudeau, QC (CYUL) descending via FL180 was the target of a blue laser coming from the right-hand side. The first officer was temporarily blinded. There was no evasive manoeuvre.

March 25, 2019

Incident at TOXIP intersection

A WestJet Boeing 737-7CT (C-GWBF/WJA574) from Winnipeg/Richardson, MB (CYWG) to Ottawa/Macdonald-Cartier, ON (CYOW) that was cleared to descend to FL180, passed the limit of CYR543, which was active up to FL180, by 3.5 NM and 600 ft. After verification, there was no activity in CYR543. No impact on operations.

March 4, 2019

Incident at 5226N / 06754W (ELT)

An American, corporately registered Cessna 525 (N793CJ/JSL21) from North Bay, ON (CYYB) to Wabush, NL (CYWK) reported an emergency locator transmitter signal (ELT) at position 5226N/06754W, at an altitude of FL180. The signal was lost on approach to CYWK. The Joint Rescue Coordination Centre (JRCC) Halifax (HZ) was advised. No impact on operations.

June 30, 2019

Incident at 5748N / 12857W

An Air Spray (1967) Ltd. Lockheed 188A (C-FVFH/ASB489) from Prince George, BC (CYXS) to Whitehorse, YT (CYXY) was cleared to 16000 while in controlled airspace (WICA). Aircraft checked in with Whitehorse (XY) radio (RDO) when 50NM from Dease Lake, BC (CYDL) at FL180. Controller had radio confirmation that the aircraft was at FL180. Aircraft confirmed FL180, and the controller re-cleared the aircraft to FL180. No impact to operations.

February 7, 2019


TSB report #A19F0034: C-GLQQ, a Bombardier DHC-8-400 aircraft operated by Porter Airlines, was conducting flight POE122 from Newark/Liberty Intl (KEWR), NJ to Toronto/Billy Bishop Toronto City (CYTZ), ON with 4 crew members and 27 passengers on board. As power was reduced once the aircraft reached its initial cleared altitude of 14 000 feet after the departure from KEWR, the flight crew noticed an unusual noise coming from the engines. Simultaneously, a POWERPLANT message was received, which prompted the flight crew to execute the QRH. In the absence of abnormal engine indications, the flight crew continued to monitor the situation, and contacted the operator’s maintenance via ACARS. Following a step climb to FL180, the number 2 Propeller Electronic Control (PEC) caution light illuminated, and the number 2 propeller RPM rose to 1060. The flight crew executed the QRH one more time, shut the number 2 engine (Pratt & Whitney Canada PW150A) down, declared an emergency, and elected to divert the aircraft to Wilkes-Barre/Scranton Intl (KAVP), PA where it landed without further incident with ARFF standing by. Following an inspection, the aircraft taxied to the terminal building. Maintenance personnel determined that the number 2 Beta Feedback Transducer (BFT) failed, causing the propeller to initially go into an underspeed condition, followed by an overspeed condition. It was held at higher than normal propeller speeds (1060) by the Over Speed Governor (OSG) until the flight crew shut the engine down. The incident has been entered into the operator’s Safety Management System for further investigation.

May 7, 2019


An Air Canada Airbus A330-343 (C-GHKX/ACA139) from Toronto/Pearson, ON (CYYZ) to Calgary, AB (CYYC) advised of an oxygen supply issue in the cockpit and requested a decent to FL180 as a precautionary measure. The request was accommodated, no impact to operations.

November 1, 2019

Incident at 4245N / 05814W

The pilot of a Volga-Dnepr Airlines Antonov AN-124 (VDA2406) from Gander, NL (CYQX) to NASA Shuttle Landing Facility, FL (KTTS) stated that they required an immediate descent to FL180 due to cargo issues. The aircraft was issued alternate instructions to accommodate their concerns and the flight carried on to destination without further incident. No emergency or impact to operations.

June 28, 2018

Incident at 4723N / 06952W

At FL370, a United States Air Force Boeing CC-177 Globemaster III (RCH564) from New York Stewart International, NY (KSWF) declared an emergency due to a cabin pressurization issue. The aircraft descended to FL180 and asked if it could return to KSWF. No impact on operations.

May 31, 2018

Incident at 4711N / 07038W

A Government of Canada, Department of National Defence Lockheed C-130 (CF3840) from Charlevoix, QC (CYML) to Trenton, ON (CYTR) reported a drone flying eastbound from position 4711N 07038W FL180. No impact on operations.

January 29, 2018


While on its way to Chicoutimi/St-Honoré, QC (CYRC), at FL190, a Max Aviation Beech B100 (C-GMNL/MAX180) from Montreal/St-Hubert, QC (CYHU) to Chicoutimi/St-Honoré, QC (CYRC) requested to return to CYHU due to a problem with engine #1. The aircraft requested to go directly to the airport and land on the runway against the wind. It did not declare an emergency. The air traffic controller (ATC) handled the situation as an emergency and called emergency services at the destination. MAX180 landed on Runway 24R at CYHU at 1830Z without incident. No impact on operations.
UPDATE TSB Report #A18Q0011: C-GMNL, a Max Aviation Inc. Beechcraft B100 (MAX180), was on an instrument flight rules (IFR) flight from Montreal/St-Hubert, QC (CYHU) to Chicoutimi/St-Honoré, QC (CYRC) with 9 passengers and 2 crew members. During the climb, while passing FL180, the inter-turbine temperature of the left engine (Garrett TPE331-6-252B) increased over the limit. The crew reduced the power to minimum and diverted to CYHU. The engine was kept running and the aircraft landed on Runway 24R without incident with aircraft rescue and fire fighting (ARFF) services on alert. No one was injured and the aircraft was not damaged.

June 25, 2018

Incident at 0NM N NADPI intersection

Duplicate report of 2018P1052 (AOR 234327-V1)
TSB #A18W0088: C-GFFI, a privately operated Piper PA31, was conducting an IFR flight from Edmonton, AB (CYEG) to Tofino, BC (CYAZ) with 1 pilot and 4 passengers on board. While in cruise in IMC at FL180 the left engine (Avco Lycoming TIO-540-A2C) lost power. The pilot attempted to restore power but was unsuccessful. The aircraft was unable to maintain altitude on one engine and a controlled descent and turn back to CYEG was initiated by the pilot. The area minimum altitude (AMA) in the area of the descent was 13 900 feet. The pilot declared an emergency by relaying a message through another aircraft as radio contact was lost with ATC due to terrain and being below 14 000 feet. The pilot relied on a synthetic vision terrain depiction on a personal electronic device to ensure adequate separation from terrain. While descending through 10 000 feet the pilot was able to restart the engine and the flight continued uneventfully to CYEG. Maintenance did not find any issues with the engine and the aircraft was returned to service.
A Morgan Oilfield Services Ltd. Piper PA-31 (C-GFFI) on a flight from Edmonton International, AB (CYEG) and landing at Edmonton International, AB (CYEG) advised of engine failure and requested descent. The aircraft was unable to maintain altitude and descended below the minimum IFR altitude without clearance. Using communication relay through another aircraft, C-GFFI declared MAYDAY but subsequently advised that no emergency response was required, cancelling MAYDAY. The aircraft landed without issue at 1610Z.

March 27, 2018

Incident at 13NM PRINCETON BC (CYDC)

A Horizon Air Industries, Inc. de Havilland DHC-8-400 (QXE2429) from Kelowna, BC (CYLW) to Seattle, WA (KSEA) that was climbing to FL240, requested to stop climb at FL180 due to pressurization indication and then subsequently required descent. Traffic at 17 000 feet responded to a traffic alert and collision avoidance system (TCAS) and started descent and was instructed to continue descent to 14 000 feet. QXE2429 was instructed to turn left to accommodate descent to 12 000 feet. QXE2429 squawked emergency code subsequently landing safely in Seattle, WA (KSEA) at 1359Z.

October 12, 2018

Incident at 70NM E TORONTO / LESTER B. PEARSON INTL ON (CYYZ) (Communication navigation surveillance/air traffic system)

Separation was compromised when an Air Canada Airbus A330-300 (ACA7140) from Montreal/Pierre Elliott Trudeau, QC (CYUL) to Toronto/Lester B. Pearson, ON (CYYZ) descended through FL180, 3NM ahead of a WestJet Encore de Havilland DHC-8-402 (WEN3533) from Montreal/Pierre Elliott Trudeau, QC (CYUL) to Toronto/Lester B. Pearson, ON (CYYZ) at 17200 ASL.
Update TSB Report #A18O0152: Approximately 70nm east of Lester B. Pearson Intl-Toronto (CYYZ) an Air Canada Airbus A330-300 aircraft (flight ACA7140) was cleared by ATC to descend to 17,000 feet. Approximately 3nm behind the A330 was a WestJet Encore DHC-8-402 (flight WEN3533) descending through 17200 feet. Separation between the two aircraft reduced to 3nm in an area where 5nm or 1000 feet is required.

July 7, 2018

Incident at BOXUM intersection

A Jazz de Havilland DHC-8-102 (JZA8338) from Sault Ste. Marie, ON (CYAM) to Toronto/Lester B. Pearson Int'l, ON (CYYZ) encountered wake turbulence through FL180 from an Air Canada Boeing 787-9 (ACA118) from Vancouver Int'l, BC (CYVR) to Toronto/Lester B. Pearson Int'l, ON (CYYZ). There was no operational impact.

June 24, 2018


A Chrono Aviation Beech 1900 (NDL191) from Montreal/Pierre Elliott Trudeau Int'l, QC (CYUL) to Timmins/Victor M. Power, ON (CYTS) began a descent from FL200 without a clearance. Through FL180, NDL191 was then cleared down to 6000 feet. No operational impact.

November 2, 2018

Incident at Erie (KERI)

TSB #A18F0261: C-GBHO, an Airbus 319-100 aircraft operated by Air Canada Rouge, was conducting flight ROU1735 from Liberia/Daniel Oduber Quirós Intl (MRLB), Costa Rica to Toronto/Lester B. Pearson Intl (CYYZ), ON. During cruise flight, the flight crew received reports of significant turbulence in the vicinity of Pittsburgh Intl (KPIT), PA. As a result, the cabin was secured early, all passengers and crew were instructed to remain seated with seatbelts fastened, and an early descent to FL230 was initiated due to ride reports which indicated more favourable conditions at that altitude. In the vicinity of Erie Intl/Tom Ridge Field (KERI), PA, the flight encountered significant turbulence which caused an abrupt change in altitude and airspeed, with the aircraft climbing to FL235. ATC was notified, and a lower altitude was requested and granted. Upon reaching FL180, flight conditions were smooth and the flight was subsequently completed uneventfully. No persons were injured, nor was any damage caused to the aircraft as a result of the turbulence encounter. The operator’s maintenance inspected the aircraft and found no faults. The aircraft was returned to service.

April 9, 2018

Incident at KENKI intersection

An American corporately registered Cessna 208 (N767XP) appeared on the radar at a flight level of 18 000 feet (FL180), although estimates indicated 17,000 feet. When questioned by air traffic control (ATC), the pilot stated that they received clearance at flight level of 18 000 feet (FL180) 10 minutes after take-off. No impact on operations.

April 2, 2018

Incident at 5118N / 11431W

UPDATE from Airworthiness: A Civil Aviation Safety Inspector (CASI) looked into this occurrence. The aircraft was flown to a maintenance base on a Ferry Permit. The Aircraft Maintenance Engineers (AMEs) performed an inspection and determined that low nitrogen pressure in the shock strut was causing insufficient strut extension to activate the weight off wheels switch. The strut seals were reconfigured, the strut was serviced and the aircraft was returned to service.
An Air Partners Cessna Citation 10 (SDE571) from Calgary, AB (CYYC) to Grande Prairie, AB (CYQU) was cleared to FL260 and on climb requested lower at FL180 due to a gear issue. No further assistance required. No impact to operations.

February 14, 2018


A Calm Air Aerospatiale ATR 42-300 (CAV240) on a flight from Winnipeg/James Armstrong Int'l, MB (CYWG) to Sanikiluaq, NU (CYSK) received authorization to descend to FL180. The aircraft was supposed to call back passing FL180 but did not. No impact to operations.

January 14, 2018

Incident at TALOYOAK NU (CYYH)

At 0011Z, Taloyoak, NU (CYYH) community aerodrome radio station (CARS) operator reported a Canadian North de Havilland DHC-8-106 (C-GRGO/ MPE478) from Kugluktuk, NU (CYCO) to Taloyoak, NU (CYYH) declared an emergency on approach due to haze in the cockpit. The aircraft landed without incident.
UPDATE from Airworthiness: A Civil Aviation Safety Inspector (CASI) looked into this occurrence. The #2 Engine developed an internal oil leak which allowed smoke to enter the bleed air supply to the aircraft pressurization system. Engine has been replaced, and will be sent to shop for assessment and repair. The Operator is handling this occurrence through their safety management system (SMS).
UPDATE: TSB Report#A18C0003: C-GRGO, a Bombardier DHC-8-100 aircraft operated by Canadian North Inc, was conducting flight MPE478 from Kugluktuk, NU (CYCO) to Taloyoak, NU (CYYH) with 3 crew members and 14 passengers on board. On descent through FL180 into CYYH, the flight crew noticed a haze in the cockpit that was becoming light smoke. The crew declared an emergency and continued the approach. When the aircraft was descending though 10000 feet, the smoke started to clear. The aircraft landed without incident. After landing, no source of the smoke was found. The operator's maintenance inspected the aircraft and determined the aircraft was safe to ferry to Yellowknife, NU (CYZF) for further maintenance.

July 11, 2018

Incident at 4928N / 04757W

A Lockheed C-130 (Hercules) (KING04) from Portsmouth, NH (KPSM) to Shannon, Ireland (EINN) reported an oil pressure fluctuation. The aircraft declared a mechanical emergency and requested to turn back to St. John's, NL (CYYT). The aircraft descended to FL180 as a precaution and landed safely at CYYT at 0147Z.

May 24, 2018

Incident at 69NM SYDNEY NS (YQY) VOR/DME (Communication navigation surveillance/air traffic system)

A WestJet Encore de Havilland DHC-8-402 (C-GEWR/WEN3484) from Halifax/Stanfield International, NS (CYHZ) to Sydney/J.A. Douglas McCurdy, NS (CYQY), at a flight level of 19,000 (FL190), began overtaking a Jazz de Havilland DHC-8-311 (C-GABP/JZA8816) from Halifax/Stanfield International, NS (CYHZ) to Sydney/J.A. Douglas McCurdy, NS (CYQY) at 17,000, QY altimeter 29.75. WEN3484 was issued a descent to flight level 18,000 (FL180), which is not a usable flight level for the altimeter setting.
UPDATE to narrative: An Aviation Safety Program Analyst looked into this occurrence and the narrative was replaced with "A WestJet Encore de Havilland DHC-8-402 (C-GEWR/WEN3484) from Halifax/Stanfield International, NS (CYHZ) to Sydney/J.A. Douglas McCurdy, NS (CYQY), at FL190, began overtaking a Jazz de Havilland DHC-8-311 (C-GABP/JZA8816) from Halifax/Stanfield International, NS (CYHZ) to Sydney/J.A. Douglas McCurdy, NS (CYQY) at 17,000, QY altimeter 29.75. WEN3484 was issued a descent to FL180, which is not a usable flight level for the altimeter setting."

August 16, 2017

Incident at 4543N / 07249W

UPDATE: JRCC Trenton SARSUM Report#[T2017-01957]:(462117N 0724077W - Trois Riviers Quebec). Multiple 121.5 emergency locator transmitter (ELT) reports in the Montreal area. Heard on the ground in St-Hubert (emergency receiver only), St-Jean, Trois-Rivieres. 1 report of an aircraft flying very low altitude near Ham Nord, Sauvetage et recherche aériens du Québec (SERABEC) crew were unavailable until 2100Z. No associated overdue aircraft at this time 1845Z. 424 Sqn Herc tasked to home the signal and stood down prior to departure after ELT located on the ground in Trois Rivieres, QC (CYRQ). False alarm.
In descent on standard terminal arrival (STAR) for Montréal/Pierre Elliott Trudeau (CYUL), QC, at FL180, a Jazz Aviation de Havilland DHC-8-400 (JZA8548) reported hearing a loud and clear emergency locator transmitter (ELT) signal. Several aircraft and control towers north and south of Montréal then reported the ELT signal. Joint Rescue Coordination Centre (JRCC) Trenton was notified. At 1830Z, JRCC Trenton confirmed that an amateur-built, privately registered Wagaero Wagabond had taken off from St-Mathias (CSPS), QC, at 1715Z and had landed at Trois-Rivières (CYRQ), QC, at 1800Z with its ELT on. No impact on operations.

March 16, 2017

Incident at 40NM N ÎLES-DE-LA-MADELEINE QC (CYGR) (Communication navigation surveillance/air traffic system)

The controller cleared a Government of Quebec de Havilland DHC-8-315 (C-GURM/QUE40) from Îles-de-la-Madeleine, QC (CYGR) to Havre St-Pierre, QC (CYGV) to FL160. The estimated altitude was passed via the Canadian Automated Air Traffic System (CAATS) at FL180 and not updated by controller prior to radar termination and transfer to the Montreal area control centre (CZUL). No impact to operation.

March 10, 2017

Incident at 50NM S VAL-D'OR QC (CYVO) (Aerodrome, runway or taxiway shutdown)

A Max Aviation Beech B100 (C-GPRU/MAX130), from St-Hubert (CYHU), QC, to Val-d'Or (CYVO), QC, declared an emergency due to the loss of engine no. 2. Airport rescue equipment was deployed. The aircraft landed at CYVO without incident at 2245Z. The aircraft was unable to taxi and had to wait to be towed. Impact: Takeoff by a Nolinor Aviation Boeing 737-200 (NRL953) was delayed by approximately 15 min. The National Operations Centre (NOC), Air Operations Centre, and Manager, ACC Operations (MACCO) were notified.
UPDATE: TSB#A17Q0028: A Max Aviation Beech B100 (C-GPRU/MAX130) was flying IFR from Montréal/St-Hubert, QC (CYHU) to Val-d'Or, QC (CYVO) with 7 passengers and 2 flight crew members on board. While descending to CYVO, the flight crew was unable to reduce the power on the right engine (Garrett TP331-6-252B) and as they passed through FL180, they shut down the engine as a precaution. The flight crew declared an emergency and the aircraft landed on Runway 36 without incident. Aircraft rescue and firefighting services (ARFF) were on standby. No one was injured and the aircraft did not sustain any damage. The right engine fuel control unit (FCU) was replaced, and after a ground check, the aircraft was returned to service.

March 14, 2017


UPDATE: TSB Report#A17C0029: C-GZVJ, a Beech 1900D aircraft operated by Wasaya Airways, was conducting flight WSG952 from Sioux Lookout, ON (CYXL) for Thunder Bay, ON (CYQT) with a crew of two and 13 passengers on board. During the initial climb, both the electric and manual elevator trim jammed and the flight crew had to apply control input in order to maintain the flight profile. The flight crew elected to continue their flight to CYQT and requested a block altitude between FL180 and FL190 for possible flight oscillations. No emergency was declared and the aircraft landed without further event at CYQT. The operator's maintenance inspection of the elevator trim system revealed an inoperative electric clutch plate. The electric clutch plate was replaced and the aircraft was returned to service. The operator submitted a service difficulty report with Transport Canada.
At approximately 1745Z, a Wasaya Airways Beech 1900D (WSG952) from Sioux Lookout, ON (CYXL) to Thunder Bay, ON (CYQT) reported a mechanical issue and advised proceeding to destination (CYQT). No emergency declared. No impact to operations.

March 10, 2017


A primary target at FL180 flying between 440kts and 480kts followed a WestJet Encore de Havilland DHC-8-400 (WEN3407) from Fredericton, NB (CYFC) to Toronto, ON (CYYZ) for 5 minutes. WEN3407 reports not having noticed it. No impact.

December 3, 2017

Incident at Chicago O'Hare International Airport (KORD)

TSB Report#A17F0312: C-FMZD, an Embraer ERJ 190-100 aircraft operated by Air Canada was conducting flight ACA514 from Chicago/O'Hare Intl, IL (KORD) to Toronto/Lester B. Pearson Intl, ON (CYYZ) with 4 crew members and 46 passengers on board. During the climb through FL180 after departure from KORD, the flight crew received a TCAS RA message to DESCEND. The instruction was followed, and ACA514 continued to destination without further incident.

June 25, 2017

Incident at 144NM SW Albuquerque International Airport (KABQ)

TSB Report#A17F0148: C-FSBC, a Cessna 650 aircraft operated by Chartright Air, was conducting flight HRT92 from Scottsdale, AZ (KSDL) to Wichita/Dwight D Eisenhower National, KS (KICT). During cruise flight at FL370, the right engine flamed out without warning. The flight crew declared an emergency, descended to FL180 and requested a diversion to Albuquerque Intl Sunport, NM (KABQ). During the checklist procedures, the flight crew attempted to relight the right engine. The engine did start, however it did not provide full power. The aircraft landed without further event at KABQ with ARFF standing by. The operator is conducting a full investigation under their SM program.

October 17, 2017

Incident at VOKIM intersection

A Government of Canada, Department of National Defence Lockheed C-130 (ATLS339) from Calgary, AB (CYYC) to Comox, BC (CYQQ) was cleared to FL220 enroute, the aircraft levelled at FL210 and began to descend while requesting FL200. When controller cleared ATLS339 to FL200, the aircraft was already through FL206. ATLS339 continued to descent through FL200 and requested FL180. Controller was unable to clear FL180 and cleared ATLS339 to A170 block A190. When controller cleared ATLS339 to descend, the aircraft was already through FL193. ATLS339 levelled at A170 and continues en route. No impact to operations.

June 16, 2017


At 2103Z, a Beaver Air Beech B200 (C-FTYO/ MA01) from St Theresa Point, MB (CYST) to Winnipeg, MB (CYWG) was observed on radar at FL180 without an Air Traffic Control (ATC) Clearance. MA01 was subsequently issued a clearance and was advised to contact the Shift Manager after landing. No impact to operations. No traffic in the vicinity.

February 11, 2017


An Alkan Air Beech 200 (C-FAKN) from Nanaimo, BC (CYCD) to Whitehorse, YT (CYXY) descended below FL180 into uncontrolled airspace and cancelled instrument flight rules (IFR). It reached 40NM from CYXY and entered Class B airspace laterally at 13 500 feet without a clearance.

January 13, 2017

Incident at IQALUIT NU (CYFB)

Following takeoff from Iqaluit (CYFB), NU, a Skyservice Business Aviation Learjet 45 (C-GMCP), from Iqaluit (CYFB), NU, to Québec (CYQB), QC, reported that a landing gear door remained open. No emergency declared. C-GMCP initially requested FL180 but after contacting its maintenance service, C-GMCP requested a higher flight level. C-GMCP landed without incident at 1757Z. No impact on operations.

January 9, 2017


A Buffalo Airways Lockheed L 188 (BFL1409) from Yellowknife, NT (CYZF) to Fort Good Hope, NT (CYGH) needed to descend from FL200 due to a pressure indication. The flight was unable to contact Air Traffic Control (ATC) so had to descend without a clearance. BFL1409 stabilized at FL180. ATC was advised once in range of the next assigned frequency and issued a new clearance at FL180. No traffic. No impact to operations.

November 5, 2017


A CANLink Aviation Beech C90A (C-FSXG) on a flight from Moncton/Greater Moncton, NB (CYQM) to Montreal/Pierre Elliott Trudeau (CYUL), QC, was cleared to FL180. When level, mode C on display showed the aircraft at FL183. The aircraft confirmed on altimeter setting 2992 and tried a second transponder with same result. The pilot was instructed to turn off mode C and they advised that they would inform their company as well. No impact to operations.

July 18, 2017

Incident at 6300N / 00030W

Coordination error. An American Socata TBM 700 (N755JG) from Narsarsuaq, Greenland (BGBW) to Goose Bay, NL (CYYR) was coordinated at FL280 but instructed to enter Kangerlussuaq, Greenland (BGSF) below FL180.

July 5, 2017

Incident at 4424N / 06450W

An American corporately registered Gulfstream GVI (N919SB) on a flight from (KATW) requested clearance to return to KATW due to a mechanical issue. Boston, MA, Center advised and they stated they would give the aircraft routing after ALLEX to KATW. The aircraft descended from FL370 to FL180. The flight exited Moncton, NB (CZQM) airspace at 0120Z.

May 17, 2017

Incident at 4706N / 05745W

A WestJet Encore Bombardier DHC-8-402 (C-FJWE/WEN3421) from St. John's, NL (CYYT) to Halifax/Stanfield, NS (CYHZ) descended without clearance from FL200 to FL180 due to severe turbulence. The flight advised air traffic control (ATC) during descent. The flight was subsequently cleared at FL180. No traffic. No other impact to operations.

March 18, 2017

Incident at 50N045W

A United States Air Force Lockheed C-130 Hercules (RCH267) from Glasgow, Scotland (EGPK) to St. John's, NL (CYYT) requested to lower due to aircraft performance. Flight was advised it was unable to lower due to traffic. Flight advised offsetting 15NM to the right off course and descending from FL240 to FL180.

January 6, 2017


UPDATE: TSB Report#A17A0001: N2679C, a Lockheed 382G-44K-30 (C-130) aircraft operated by Gulf Air Group Inc, was enroute from Portland Intl. Jetport, ME (KPWM) to Terceira/Aeroporto das Lajes, Portugal (LPLA) at FL230 with 5 crew members on board. About 80 nm West of Halifax, NS (CYHZ), the crew noticed a fluid leak on the number 1 engine propeller. The crew requested a return to KPWM and descended to FL180. The crew performed the Engine Shutdown procedures in accordance with the Airplane Flight Manual and declared an emergency. The aircraft continued to destination without further incident. The operator?s maintenance discovered that the number 1 propeller pump housing assembly forward lip seal was leaking. The pump housing assembly was replaced and the aircraft was returned to service.
An American corporately-registered Lockheed C-130 (Hercules)(N2679C) from Portland, ME (KPWM) to Portugal (LPLA) was enroute at FL230 when the crew advised the controller that they wanted to return to KPWM. No assistance was required at that time. The aircraft turned around and descended to FL180. Five minutes later N2679C declared an emergency and informed that they had to shut down an engine. 5 souls on board and 4 hours 30 minutes of fuel. N2679C exited Moncton airspace at 1557Z. No impact on operations.

November 21, 2016


A loud and clear emergency locator transmitter (ELT) signal was heard about 3 NM south of Mirabel (CYMX), QC, at FL180. After verification, the source was a Bell Helicopter Textron Canada Ltd. Bell 505 (C-FTVQ) on the ground at Textron. No signal since 1316Z. No impact on operations.

November 10, 2016

Incident at 91 NM S LA GRANDE-4 QC (CYAH)

After being authorized outside of airspace below FL180, a de Havilland DHC-8-402 (C-GHQP HYD162), from Bagotville (CYBG), QC, to La Grande (CYAH), QC, was seen deviating east of its authorized route while the aircraft was still in controlled airspace at FL250. No impact on operations.

October 10, 2016

Incident at Overhead VLV VOR

TSB #A16Q0125: C-GIJZ, a de Havilland DHC-8-402 aircraft operated by Jazz, was conducting flight JZA8512 from Charlottetown, PE (CYYG) to Montreal/Pierre Elliot Trudeau Intl, QC (CYUL). During cruise flight overhead the Beauce VOR (VLV) at FL240 with the seat belt sign on, the flight encountered severe turbulence that lasted for approximately 3 to 4 minutes. The autopilot disengaged, followed by large changes in pitch and roll. The flight crew requested a descent to FL180 where the conditions were reported to be smooth. As the first officer was unable to reach the flight guidance control panel, the captain tried to regain control of the aircraft during which there was a lot of yaw, pitch and roll oscillations. Once the flight reached FL180 in smooth air, the flight crew contacted the cabin crew to inquire on their status and the one of the passengers. The flight attendant reported that a trolley cart tripped over, however there were no injuries. The flight proceeded to CYUL with no further issues. The operator downloaded the data from the flight data recorder to confirm that the limits of the aircraft maintenance manual have not been exceeded. Based on the data extracted, none of the limits were exceeded. No further action was required as per AMM 05-50-11.

August 23, 2016

Incident at In the vicinity of: MONTRÉAL / PIERRE ELLIOTT TRUDEAU INTL Q

At the Boston transfer, an Embraer ERJ 170-200 SU operated by Sky Regional (SKV7702) from Houston (KIAH) TX to Montreal (CYUL) QC reported descent to FL180, despite having been authorized for FL280 and correctly re-reading this. In addition, SKV7702 deviated from STAR HAABS3 by 17 miles to the South of the DAVDA holding point. No impact.

April 29, 2016

Incident at 20 S LONDON ON (YXU) VOR/DME

UPDATE: TSB#A16O0056: C-FMDO, a privately operated Piper PA-46-500TP aircraft from Toronto/Buttonville Municipal, ON (CYKZ) to St. Louis/Spirit of St. Louis, MO (KSUS), was at FL210 when the pilot and the passenger became light headed. The aircraft descended to FL180 and oxygen masks were donned. When an odor started to develop in the cabin, the decision to divert to London, ON (CYXU) was made and the pilot declared an emergency. The aircraft landed uneventfully with ARFF standing by. Maintenance personnel completed pressurization checks, cleaned the outflow valves, and ordered replacement passenger oxygen generators. No faults were found with the pressurization system.
A Promanex Inc. Piper PA-46-500TP (C-FMDO) from Buttonville, ON (CYKZ) to St. Louis, MO (KSUS) reported smoke in the cockpit, declared an emergency and rerouted to London. The aircraft landed safely. (Duplicate AOR 199958-V1)