January 12, 2021


A Sunwest Aviation Learjet 35A (C-GTJL/CNK633) from Thunder Bay, ON (CYQT) to Halifax/Stanfield, NS (CYHZ) declared an emergency on approach to Runway 23. The aircraft advised of one engine shutdown. The National Operations Centre (NOC) and the Joint Rescue Coordination Centre (JRCC) Halifax were advised. The aircraft landed safely at 1208Z. No impact on operations.
UPDATE: TSB Report #A21A0002: C-GTJL, a Learjet 35A aircraft operated by Sunwest Aviation Ltd., was conducting flight CNK633 from Thunder Bay, ON (CYQT) to Halifax/Stanfield, NS (CYHZ). At an altitude of about 10 000 feet and 20NM West of CYHZ, the flight crew noted a master warning and number 1 engine (Garrett, TFE731-2-2B) power loss, accompanied by low number 1 engine oil pressure, as well as the illumination of left fuel pressure and left generator indications. The flight crew declared an emergency and carried out checklist actions for engine failure in flight and single-engine landing. The flight continued the approach to CYHZ, where the flight landed without further incident. The operator will coordinate with the engine manufacturer to determine the cause of the engine power loss.

December 5, 2020


A Sunwest Aviation Ltd. Learjet 35A (C-GTJL/CNK633) from Vancouver, BC (CYVR) to Calgary, AB (CYYC) commenced a missed approach at 2 miles final for Runway 17R due to a nose wheel landing gear indication. CNK633 landed safely at 0753Z on Runway 17R. No impact on operations.

March 15, 2020


A Sunwest Aviation Learjet 35A (C-GTJL/CNK633) MEDEVAC from Winnipeg/James Armstrong Richardson, MB (CYWG) to Edmonton, AB (CYEG) was 20NM East of CYEG and declared Mayday due to an engine failure. Emergency services were arranged. CNK633 landed safely on Runway 30 at 0146Z. A WestJet Encore de Havilland DHC-8-402 (WEN3132) from Fort McMurray, AB (CYMM) to Edmonton, AB (CYEG) was delayed to allow CNK633 and emergency vehicles to clear the runway.
UPDATE TSB #A20W0023: The Sunwest Aviation Learjet 35, C-GTJL, operating as CNK633 on a flight from Winnipeg (CYWG), MB to Edmonton (CYEG), AB was on a descent through 12 000 feet when the left hand engine (TFE-731-2-2B) started to lose power. The throttle was advanced to try and regain power but the engine power continued to decrease. As the engine continued to lose power, the associated low oil press light came on and triggered the master warning. The crew declared a Mayday and asked for delaying vectors so they could run the associated checklists. Once the engine was secured, the flight crew told ATC they could continue inbound for a single-engine approach and landing. ARFF was requested to stand by for the landing. The landing and taxi to the FBO happened without further incident. Update: The engine was inspected and motored with no faults found. The digital electronic engine control (DEEC) had recorded the engine shutdown but there were no other indications of a fault. The aircraft had been over-wing refueled in Winnipeg (CYWG) MB by two trucks; one on each wing. The fuel request showed that additive was requested and both trucks were capable of providing the same. The aircraft was refueled after the maintenance checks in CYEG and engine test runs were undertaken with no faults found. The aircraft was then flown under a ferry permit back to Calgary (CYYC), AB for further investigation.
UPDATE from Airworthiness: A Civil Aviation Safety Inspector (CASI) looked into this occurrence. Company maintenance personnel performed maintenance checks in Edmonton, AB (CYEG), examining the aircraft fuel system and taking fuel samples for analysis. The aircraft was refueled after the maintenance checks in CYEG and engine test runs were undertaken, with no faults found. The aircraft was then flown under a ferry permit back to Calgary, AB (CYYC) for further investigation. The results of the fuel analysis indicated presence of the required anti-icing agent, however it was not possible to determine concentration of the agent, as some fuel mixing had taken place in the aircraft between the left and right systems prior to samples being taken. The aircraft has been returned to service.

August 7, 2019

Incident at In the vicinity of: CALGARY INTL AB (CYYC)

TSB #A19W0106: C-GTJL, a Learjet 35A operated by Sunwest Aviation Inc., was on a flight from Kelowna (CYLW), BC to Calgary (CYYC), AB. While in cruise, the flight crew observed that the right hand thrust reverser (TR) "UNLOCK" light had illuminated. They did not initially notice any yaw and it did not feel like the TR had deployed. While the flight crew were reviewing the abnormal checklist, they were cleared to descend to 15 000 feet at their discretion. As part of the descent checklist, the TR test button was selected and they noticed the aircraft momentarily yawed to the right. After a brief moment, the aircraft yawed even harder to the right, to approximately 20-30 degrees. The flight crew responded by selecting idle thrust on the right engine, declared a PAN PAN, and actioned the abnormal checklist for "Inadvertent Thrust Reverser Deployment In Flight". They completed the abnormal checklist and the TR unlock light remained illuminated, so the right engine (Garrett, TFE731-2-2B) was shutdown in accordance with the checklist. A single-engine approach and landing was completed into CYYC without further issue. Company maintenance has ordered a replacement pneumatic latch control valve and solenoid.
A Sunwest Aviation Ltd. Learjet 35A (CNK633) from Kelowna, BC (CYLW) to Calgary, AB (CYYC) declared a PAN PAN PAN with the arrival West controller. The pilot indicated they had a thrust reverser deployed warning. The pilot indicated they would be shutting the engine down as a precautionary measure. CNK633 landed without incident on Runway 17R at 2213Z. No impact to operations.

September 1, 2019

Incident at SASKATOON / JOHN G. DIEFENBAKER INTL SK (CYXE) (FOD (foreign object debris), Aerodrome, runway or taxiway shutdown)

A Millennium Aviation Ltd. Piper PA-28-180 (C-FZPX) from Saskatoon/Diefenbaker, SK (CYXE) to Saskatoon/Diefenbaker, SK (CYXE), in the circuit, reported striking a gull on takeoff, at 1856Z. The remains were removed at 1906Z. A Transwest Air Limited Saab 340B (C-GTJX/TW503) from Saskatoon/Diefenbaker, SK (CYXE) to Prince Albert (Glass Field), SK (CYPA) was delayed approximately 10 minutes, and a Sunwest Aviation Learjet 35A (C-GTJL/CNK633) from Saskatoon/Diefenbaker, SK (CYXE) to Calgary, AB (CYYC) was delayed approximately 5 minutes. C-FZPX landed safely at 1917Z.

September 16, 2016

Incident at YELLOWKNIFE NT (CYZF) (Incursion - manoeuvring area)

An Air Tindi Beech B200GT (C-GYKI/DA510-M) from Fort Smith, NT (CYSM) to Yellowknife, NT (CYZF) was taxiing along Bravo when they reported a coyote on the south side of the taxiway. Red 8 (vehicle)was dispatched for wildlife patrol. A Sunwest Aviation Learjet 35A (C-GTJL/CNK633-M) from CYZF to Edmonton, AB (CYEG) was delayed approximately 40 seconds while the wildlife runway patrol was completed.

May 12, 2016

Incident at 45 miles S CALGARY INTL AB (CYYC)

UPDATE: TSB#A16W0052: C-GTJL, a Sunwest Aviation Ltd Learjet 35A, was operating as flight CNK633 from Calgary Intl, AB (CYYC) to Houston/William P Hobby, TX (KHOU). While in the climb through 11 000 feet, the flight crew noticed that the aircraft was left of track and attempted to correct. Crossing 14 000 feet, the aircraft was still deviating left of track so the PIC disconnected the autopilot to correct manually. At this point, the PIC felt significant resistance in the aileron controls. After the crew confirmed that the resistance was felt on both control columns, an emergency was declared. The crew requested shallow vectors only back to CYYC. The fuel in the wing tip tanks was jettisoned and the crew disengaged the yaw damper to aid in roll control. While on an extended downwind leg for Runway 17L, the PIC noticed increased roll control followed by an abrupt freeing of the controls. The crew confirmed that the controls were operating normally but continued with the emergency check list and flew the approach with the autopilot off. The aircraft safely landed at CYYC with ARFF in attendance. Subsequent inspection by the operator?s maintenance found no faults or damage to the aircraft control system and autopilot.
A Sunwest Aviation Learjet 35 (CNK633) from Calgary, AB (CYYC) to Houston, TX (KIAH) reported flight control issues and elected to return to CYYC. The aircraft was required to dump fuel for approximately 1 minute prior to joining downwind for Runway 17L. The aircraft landed safely at 1442Z. Aircraft Rescue and Fire Fighting (ARFF) was on standby. No impact on operations.

March 14, 2015

Incident at Kelowna

TSB#A15P0064: C-GTJL, a Sunwest Aviation Learjet 35A, was on approach into Kelowna, BC (CYLW) when the passengers advised the flight crew that there was smoke present in the cabin. The first officer investigated within the passenger seating area, but was unable to determine the source of the smoke. The flight crew continued the approach into CYLW. After landing, the smoke began to dissipate and the passengers and crew deplaned normally on the ramp. Maintenance determined that a pressurization bleed leaked onto the aircraft insulation and was the source of the smoke.

November 18, 2015

Incident at 60 miles E CALGARY INTL AB (CYYC)

A Sunwest Aviation Learjet 35 (CNK633) from Calgary, AB (CYYC) to Winnipeg/James Armstrong Richardson, MB (CYWG) returned to CYYC after reporting a strange smell in the cockpit. No assistance was requested and no impact on operations.
UPDATE: TSB#A15W0171: The Sunwest Aviation Bombardier Learjet LR35A (C-GTJL) was on the initial climb out of Calgary Intl, AB (CYYC) for a flight to Winnipeg/James Armstrong Richardson Intl, MB (CYWG) when the crew turned on the wing anti-ice system. Shortly after, the crew detected an apparent burning smell. They immediately turned off the anti-ice since icing was no longer a factor. The First Officer went to the cabin but could not identify the source. However, a faint bluish haze could be detected. As the bleed air ducting for the wing heat runs through the cabin, the crew ascertained that this was the source of the problem. At this point, the decision was made to return to CYYC. The aircraft landed without further incident. The subsequent investigation by maintenance personnel revealed a leak in the wing bleed air system. The fault has been rectified and there will be a test flight prior to returning the aircraft to service.

August 25, 2014

Incident at TERRACE BC (CYXT)

A Sunwest Aviation Learjet 35A (C-GTJL/ CNK633) from Grande Prairie, AB (CYQU) to Terrace, BC (CYXT) landed on Runway 33 without any contact with the flight service station (FSS). Aircraft stated they had been on the wrong frequency during the approach. No operational impact.

May 17, 2005


CNK 633, a Lear 35 medevac flight, had departed from Calgary at 0738Z and was 15 NE of Calgary when the crew advised ATC the flight was cancelled by company dispatch and they would return to the airport. Before landing, the crew advised they needed to dump fuel so the a/c was vectored to a position where this could be accomplished safely. The fuel dump commenced at 0744Z from 5059N and 11331W and ended at 0746Z at 5055N and 11316W with cautionary warning broadcast being issued by the TCU controller during the occurrence. The aircraft landed without incident at 0754Z. No impact on other aircraft.
UPDATE Maintenance & Manufacturing advised that the aircraft C-GTJL was doing an organ transfer to Windsor, Ontario for the HOPE program. The flight was cancelled by the customer because of a problem with the organ.

March 9, 2005

Incident at EDMONTON INTL AB (CYEG) (Conflict - loss of separation, ATS operating irregularity)

UPDATE TSB reported that the Sunwest Home Aviation Lear 35A (C-GTJL), operating as CNK 633 had departed the Edmonton City Centre Airport. CNK 663 was climbing southbound to a cleared altitude of FL 250, with a request for FL 340. A Canadian North Fokker 28 (C-FTAY), operating as MPE 462 was en route to Yellowknife at FL 260. The En Route Sector Controller provided approval for the Terminal Controller to clear CNK 633 to climb unrestricted to FL 340. The Terminal Controller was then advised that the climb approval was in reference to MPE 462. However, prior to the Terminal Controller receiving the information about MPE 462, CNK 633 had climbed past FL 250. Separation between the aircraft was 4.3 miles and 700 feet vertical where 5 miles or 1000 feet was required.
UPDATE ANS and Airspace reported that Nav Canada will conduct a Level 2 Operational Safety Investigation concerning this incident.
MPE 462, a Fokker F28, was en route from Calgary to Yellowknife at FL 260 while CNK 633M was climbing out from City Centre Airport en route to Spokane, WA. CNK 633M was cleared to climb to FL 340 and when the two a/c were about 15 NM south of the Edmonton VOR, separation between them deteriorated to 4.3 NM in an area where 5 NM are required. An Operational Safety Investigation by Nav Canada is likely.

February 26, 2004

Incident at en-route from Montréal to Edmonton

Initial information from T.S.B. Initial Notification (#A04C0049): Flight CNK633, a Learjet 35A aircraft owned by Sunwest Home Aviation Ltd., registration C-GTJL, was on a medevac (human organ transport) flight from Montréal to Edmonton. During the climb through 16,000 feet, the flight crew noticed that they were only able to achieve a cabin altitude of 5,000 feet. The flight crew elected to remain at 16,000 feet and diverted the aircraft to Thunder Bay Airport (CYQT) to refuel. After departing Thunder Bay, the pressurization system was able to achieve maximum differential and the aircraft climbed to 39,000 feet.

March 14, 2003

Incident at EDMONTON INTL AB (CYEG) (Conflict - potential, ATS operating irregularity)

UPDATE TSB reported that CPB 202, a Jetstream 3112, registered C-FMIP, was en route on an IFR flight from Calgary to Edmonton at 16,000 feet. CNK 633, a Learjet 35A, registered C-GTJL, was also en route on an IFR flight from Calgary to Edmonton at FL 260. At 1700 MST, the Red Deer Enroute Sector Controller cleared CPB 202 to 10,000 feet and five minutes later, the same Controller also cleared CNK 633 to 10,000 feet. After both aircraft had contacted the Edmonton Arrival Terminal Controller, a potential conflict was detected, and CNK 633, which was overtaking CPB 202, was instructed to stop the descent at 17,000 feet. Both aircraft arrived at their destination without further incident. There was no loss of separation, however safety was not assured when both aircraft were cleared to the same altitude, with a significant speed differential between them.
UPDATE ANS and Airspace reported that Nav Canada will hold an Operational Safety Investigation concerning this occurrence.
CPB 202, a BAe Jetstream 31, was IFR Calgary (YYC) to City Centre Airport (YXD) at 16,000 feet. CNK 633, a Lear 35, was also enroute IFR YYC to YXD at FL 260. At 0002Z, the Enroute Controller cleared CPB 202 to 10,000 feet ASL with instructions to contact the Terminal Controller on 120.5 Mhz. At 0005Z the Enroute Controller cleared CNK 633 to 10,000 feet ASL with instructions to contact the Terminal Controller on 120.5 Mhz. When contacted by CNK 633, the Terminal Controller cleared CNK 633 to maintain 17,000 feet ASL. Both aircraft arrived at YXD without further incident. No loss of separation occurred, however, safety was not assured when the Enroute Controller cleared CNK 633 (which was overtaking CPB 202) to the same altitude.

May 26, 1998

Incident at Calgary, AB

The crew of C-GTJL advised Calgary Tower of a suspected landing gear problem, when they were on approach after a flight from Edmonton. They did a fly-by of the Tower and it appeared that the gear was extended normally, however, the crew requested that CFR be on standby. The crew landed the a/c without further incident at 0028Z. OPI - System Safety UPDATE TSB reported that the company discovered a burned-out light bulb in the gear indicator lights. The bulb was a "grain of wheat" type that could not be changed in-flight. During the fly-by of the Tower, both landing lights were seen to be on, which was an indication that the gear was locked down.