September 24, 2019

Incident at 45NM BAIE-COMEAU QC (CYBC)

A French registered Dassault Falcon 900EX (FWWFY) from Goose Bay, NL (CYYR) to Little Rock, AR (KLIT) declared an emergency due to a cracked windshield. The aircraft requested to descend and land at Montreal/Pierre Elliott Trudeau, QC (CYUL). Necessary measures were taken with the adjacent sectors. No impact on operations.
Update: TSB Report A19Q0160: a privately registered Falcon 900LX (F-FWWY) was on an instrument flight rules (IFR) flight from Goose Bay, NL (CYYR) to Bill & Hillary Clinton National/Adams Field, U.S. (KLIT) with just 2 pilots on board. While the aircraft was cruising at FL430 approximately 45 NM west of YBC, a crack appeared on the middle windshield in the 3 right-side windshields. The crew declared an emergency and diverted to Montreal/Pierre Elliott Trudeau, QC (CYUL). The aircraft landed without incident. There were no injuries or damage.

April 15, 2019


An American corporately registered Hawker Beechcraft Hawker 4000 (N400VR/DCM4000) from Keflavik, Iceland (BIKF) to Toronto/Lester B. Pearson, ON (CYYZ) had equipment suffix W indicated on the flight plan. The aircraft advised when issued descent from FL430 that they were negative reduced vertical separation minimum (RVSM). When queried the pilot reported that the aircraft was capable and FAA approved but the paperwork was incomplete for International Operations.

September 2, 2019

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

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

May 31, 2019

Incident at 5200N / 05200W

A Worldwide Jet Charter Gulfstream Aerospace Gulfstream IV (N310/WWI31) from Springfield-Beckley, OH (KSGH) to London/Luton, UK (EGGW) declared an emergency and started to descend from F430 due to smoke in the cockpit and pressurization issues. The flight was cleared direct Gander, NL (CYQX) and landed without incident at 1225Z. No traffic or impact to operations.
UPDATE: CADORS 2019A0647 (AOR 249759-V1) was a duplicate of this occurrence and was deleted.
Update TSB #A19A0032: N310, a Gulfstream IV aircraft operated by Worldwide Jet Charter, was conducting flight WWI31 from Springfield-Beckley Municipal (KSGH), OH to London/Luton (EGGW), UK. While in cruise flight at FL430, the flight crew noted smoke in the cockpit. The flight crew were unable to pinpoint the origin of the smoke, but noted that it was blue with no noticeable odor. An emergency was declared, the oxygen masks were donned, the aircraft diverted to Gander Intl (CYQX), NL, and the flight crew started to descend to 15 000 feet. As the aircraft was descending, the smoke dissipated and one of the pilots removed their oxygen mask to enable clear radio communication. The aircraft landed without further incident 35 minutes after the incident started, with ARFF standing by. The operator’s maintenance determined that the smoke was actually water vapour caused by the decompression. An operational flight was conducted, and the aircraft was returned to service.

April 29, 2019

Incident at 4641N / 06338W (ELT)

A Talon Air Gulfstream Aerospace 5 (TFF967) from London, United Kingdom (EGGW) to Republic, NY (KFRG) reported a weak emergency locator transmitter (ELT) at FL430. Joint Rescue Coordination Centre (JRCC) Halifax was advised.

August 2, 2018

Incident at 5039N / 06531W

A Sardinian Sky Service Cessna 560XL (SSR438) on a transborder flight from Goose Bay, NL (CYYR) to Teterboro, NJ (KTEB) was observed climbing from FL430 to FL435 without clearance. The aircraft was queried and they reported encountering moderate to severe turbulence. The flight was able to return to FL430. No reported damage or injuries.

March 9, 2018

Incident at 6313N / 04222W

An American corporately registered Gulfstream GVI (N922H) on a flight from Helsinki Vantaa Airport, Finland (EFHK) to Morristown, NJ (KMMU) reported moderate to severe turbulence with flight level fluctuation between FL420 and FL430.

November 22, 2018


A Chartright Air Bombardier BD-700-1A11 (HRT819) from Halifax, NS (CYHZ) to Toronto, ON (CYYZ) was cleared to FL430. The aircraft was observed climbing to FL435. No loss of separation.

October 5, 2018


Severe turbulence at FL430 was reported by an American, corporately registered Gulfstream GV (N808JG) from West Palm Beach, CA (KPBI) to Santorini (Thira), Greece (LGSR). The aircraft descended to FL410 and reported that it was smooth. No damage or injuries were reported. The Halifax Flight Information Centre (FIC) was advised.

May 29, 2018

Incident at 5630N / 05400W

An American, corporately registered Cessna 525B (N866ST) from Goose Bay, NL (CYYR) to Reykjavík, Iceland (BIRK) was observed on the radar descending from a cleared flight level of 45,000 (FL450) to a flight level of 43,000 (FL430). The aircraft was advised to climb immediately to a flight level of 45,000 (FL450), and the aircraft complied. The flight continued without further incident. No loss of separation.

February 2, 2018

Incident at 4514N / 03816W

A VistaJet Bombardier BD-700-1A10 (VJT813) made a controller-pilot data link communications (CPDLC) request for FL430 and was told to StandBy. The flight made a mistake when it received StanBy and climbed to FL430. The aircraft was re-cleared to FL430 via CPDLC. Nil traffic.

January 5, 2018

Incident at 5400N / 04200W

An American corporately registered Dassault Mystere Falcon 900 (N24FJ) on a flight from Farranfore, Ireland (EIKY) to Morristown, NJ (KMMU) requested climb to FL430, was given clearance to reach not later than 1134Z. Flight accepted the clearance and failed to meet the restriction and advise of such. Flight advised of significant wind shear between 30W and 40W.

December 18, 2017


On initial contact, a McCain Foods Limited Learjet 45 (C-FRYS) from Florenceville, NB (CCR3) to Toronto, ON (CYYZ) was seen climbing into FL436 while it had been cleared for FL430 by the Boston air route traffic control centre (ARTCC). C-FRYS received a new clearance for FL430. No impact.

December 9, 2017

Incident at SEPT-ÎLES QC (CYZV) (ELT)

Halifax called because Gander had reported that an aircraft at FL430 had heard an emergency locator transmitter (ELT) signal above Sept-Îles, QC (CYZV). The loud and clear signal could be heard by CYZV. The ELT signal stopped at 1215Z. Searches carried out at the airport could not help identify the ELT involved. The signal came back at 1226Z, was very faint, was heard only on the emergency radio, and stopped at 1245Z.

March 15, 2017


A Government of Canada, Department of National Defense McDonnell Douglas CF-18 Hornet (KUGR21) from Mirabel, QC (CYMX) to Thunder Bay, ON (CYQT) reported a pressurization problem and requested to descend from FL430 to FL380 (negative reduced vertical separation minimum (RVSM)). The pilot did not declare an emergency. No impact on operations.

February 19, 2017


UPDATE from Airworthiness: A Civil Aviation Safety Inspector (CASI) looked into this occurrence. The aircraft experienced a low oil pressure indication on the right hand (R/H) engine. The crew followed the check list and shut down the engine. The aircraft diverted to CYYZ. Upon inspection it was discovered that the oil cap had come loose and oil had been lost through the servicing port. The cap was most likely not completely sealed when the crew last serviced it and then came loose in flight. The engine has been inspected in consultation with Williams International. An unrelated accessory pad leak had been identified during the inspection. The leak will be repaired and the aircraft will be released.
UPDATE: TSB Report#A17O0021: C-FASY, a Cessna 525B aircraft operated by AirSprint, was conducting flight ASP489 from London, ON (CYXU) to Naples Municipal, FL (KAPF). During cruise flight at FL430, the number 2 engine oil pressure began to fluctuate. The flight crew followed QRH procedures and reduced engine power to less than 80% N2. Shortly after, the flight crew received an OIL PRESSURE LOW R CAS message, and shut down the engine (Williams FJ44-3A). A decision was made to return to CYYZ where the aircraft landed uneventfully with ARFF standing by. A subsequent walk around revealed that the oil filler cap was not secured leading to a loss of oil.
An Airsprint Cessna 525B (ASP489) from London, ON (CYXU) to Toronto, ON (CYYZ) declared MAYDAY due to right engine failure. Aircraft given priority, emergency vehicles on standby. Aircraft landed safely Runway 33R at 1940Z.

August 3, 2017

Incident at 5354N / 04040W

At 1708Z, the automatic dependent surveillance (ADS) reports from an American corporately registered Gulfstream GIV-X (N228RE) on a flight from Shannon, Ireland (EINN) to Bedford, MA (KBED)indicated FL403 and the aircraft continued to climb to FL430. The climb was not expected and clearance was not issued. No other traffic affected.

July 7, 2017

Incident at NOVOK intersection

A Provincial Aerospace Cessna 750 (C-FJIC/SPR600) enroute from Belize City, Belize (MZBZ) to St. John's, NL (CYYT) with routing DRYED NOVOK CARAC reported on frequency with Moncton area control centre (ACC) and progressed NOVOK at time 0338Z at FL430. The controller was unable to radar identify the aircraft due to a failed transponder. The crew indicated that they had problems earlier with the transponder. The crew troubleshot the problem and at time 0410Z and were able to get transponder working and the aircraft was radar identified. There was no traffic, separation was not affected.

April 4, 2016


Update TSB#A16Q0038: A Bombardier CL30 (C-GOXV/ CDR325) took off from Montréal/Pierre Elliott Trudeau Intl Airport (CYUL) to conduct a local check flight with three occupants on board. At FL430, the left aileron trim tab became defective during a check of its operation. The trim stopped working at an angle of 18.8°. The crew completed the appropriate checklist and then declared an emergency. The aircraft returned to land without further incident. Examination of the aircraft revealed that the trim?s servo-actuator (S/N 638) was defective.
A Bombardier BD-100 Challenger 300 (CL30) (CDR325) on a local flight from Montreal (CYUL), QC declared a PAN PAN PAN and requested return from flight test area to CYUL because of manoeuvrability issues. Aircraft rescue and fire fighting (AARF) deployed. Aircraft provided priority and landed safely Runway 06R and taxied off runway at 1820Z. Minor delays to other customers. National operations centre (NOC), Area Control Operations (MACCO), Joint rescue coordination centre (JRCC) Trenton advised.
UPDATE from Construction: A Civil Aviation Safety Inspector (CASI) looked into this occurrence. The CASI contacted the operator involved for more information and was provided with additional details of this occurrence. Mechanical failure, aircraft component defective. Component removed and replaced with new unit. The company completed an evaluation on similar aircrafts, no failure were found. The CASI was satisfied with the information provided and advised that no further follow-up action by Transport Canada was required at this time.

May 6, 2016

Incident at 12NM NE EPSAT INTERSECTION (ATS operating irregularity)

An American corporately registered Cessna 525C (N65DD) from Burlington, VT (KBTV) to Alpine, WY (K46U) checked in with the Toronto Picton Controller while climbing to FL430. The Controller read back "roger climbing to FL450" and N65DD read back climb to FL450. N65DD was in Montreal Area Control Centre (ACC) airspace and climbed without coordination.

September 9, 2016

Incident at In the vicinity of: 680244/573432 (Communication navigation surveillance/air traffic system)

A Premium Jet Gulfstream G5 (PJZ121) from Zürich, Switzerland (LSZH) to Los Angeles, CA (KLAX) was instructed to climb to FL430 from FL400 while in airspace under the jurisdiction of Reykjavik without prior coordination. No impact on operations.

November 21, 2016

Incident at 442946N 560333W

A Mexican corporately registered Gulfstream GV-SP (XAFEM) from Madrid, Spain (LEMD) to General Escobedo, Mexico (MMAN) crossed NANSO at FL430 and advised they were in severe turbulence. The aircraft climbed to FL450 . Halifax flight information centre (FIC) was notified.

March 11, 2015

Incident at In the vicinity of: 6100N 04100W

UPDATE: TSB Report#A15A0014: The private Cessna 525, registration N86LA, was on a flight from Goose Bay, NL to Keflavik, Iceland . While at FL430, the crew advised that they were concerned about the weather at destination, and requested to divert to Narsarsuaq, Greenland. ATC was unable to give them a clearance due to traffic. Ten minutes later, N86LA declared an emergency indicating they had low fuel. ATC could not provide a clearance until reaching FL270. The aircraft descended without any risk of collision and was cleared to Narsarsuaq when reaching FL270. N86LA landed without incident.
At 1200Z, an American corporately registered Cessna 525 (N86LA) from Goose Bay, NL (CYYR) to Keflavik, Iceland (BIKF) advised that they were worried about the weather at destination BIKF, and requested to divert to Narsarsuaq, Greenland (BGBW). The aircraft was advised that an air traffic control (ATC) clearance could not be granted due to traffic and to advise intentions. Traffic was passed to N86LA. At 1210Z, the aircraft declared an emergency indicating low fuel. Aircraft was advised that an ATC clearance could not be provided until reaching FL270. Upon reaching FL270 aircraft was cleared direct to BGBW. N86LA landed without incident at 1256Z.

August 26, 2014


An American corporately registered Gulfstream G-1159A (N200AB) from Glasgow (EGPF) to Bangor, ME (KBGR), at FL430, advised that the on board emergency locator transmitter (ELT) was signalling and he was unable to shut it off.

September 14, 2014

Incident at 10 NM N RENNY intersection

An American corporately registered Dassault Falcon 2000EX (N696SB) from Harrisburg, PA (KMDT) to Stockholm (ESSB) was issued an amendment to the oceanic clearance which included a climb restriction to FL430. The aircraft was observed climbing through FL415. The controller instructed the aircraft to maintain FL410 and reconfirmed the oceanic clearance amendment. No impact on operations.

April 30, 2014

Incident at 10 NM S SAINT JOHN NB (CYSJ)

A United States Air Force Gulfstream G5 (SPAR70) from Stuttgart (EDDS) to Andrews Field, ME (KADW). The pilot reported severe turbulence at FL430. The aircraft descended to FL400 and reported smooth passing through FL420. Flight information centre (FIC) advised.

April 14, 2014

Incident at 45N050W

UPDATE: TSB Report#A14A0031: The Lyon Aviation Gulfstream G-4 (N317MJ) aircraft was en route from Nassau (MYNN) to Farnborough England (EGLF). While cleared to 45N 050W deviated north of track by 25 miles. The pilot confirmed the INS showed on course but Gander ACC corrected their course to 50W. Three other aircraft, a Swedish military G4 and two other US registered aircraft a G200 and GLF4 (registration N929AW and N663PD) were all involved in similar events at the same location 050W. The two G4 crews reported that the FMS flight in their plan entries 5050"N" were incorrectly entered as "N"5050. Apparently, this misplacement of the "N" caused the Gross Navigational Error.
An American corporately registered Gulfstream G IV (N317MJ) from Nassau (MYNN) to Farnborough (EGLF) was on a routing in part BOBTU RAFIN VODOR 45N050W 49N040W FL430...After passing BOBTU, the aircraft was cleared direct 45N050W but was observed offset left of track. Pilot confirmed he was on course to 45N050W but N317MJ progressed 45N050W 25 NM north of track. Pilot confirmed aircraft inertial navigation system (INS) showed flight was on course. N317MJ was given a 25 NM offset to the south which corrected the error. No traffic. Exited the Gander oceanic control area (OCA) at 0328Z. Shanwick advised.

December 29, 2012

Incident at en-route over Virginia

UPDATE Follow-up information received from Flight Operations - West [2013/02/20]: A Civil Aviation Safety Inspector (CASI) reviewed this occurrence and advised that it has been referred to Aviation Enforcement for further action.
Initial information received from T.S.B. Daily Notification [#A12F0169]: The Chartright Air Inc. Gulfstream/Astra SPX (G-100), registration C-GGHZ, was en-route from Liberia (Daniel Oduber Quirós) International Airport, Guanacaste Province (Costa Rica) (MRLB) to Ottawa (M-CIA) (CYOW), when at FL430, over the state of Virginia, USA, the flight crew received a bleed air leak warning on the left engine (Garrett TFE731-40R-200G). The QRH was followed and the left engine was shutdown and then re-started successfully. There was no further warning light indication and the aircraft carried on to the planned destination and landed without further incident. The operator's maintenance organisation is exploring the reason for the bleed air warning light.

August 4, 2013

Incident at 100 miles west of REDBY Intersection, NL

An American corporately registered Gulfstream G IV from Naples, Italy (LIRN) to Bangor, ME (KBGR) (N808MF) was approximately 100 miles west of REDBY intersection at FL430 when it reported a pressurization problem involving a door seal. The aircraft descended to F240 and diverted to Gander, NL (CYQX). No emergency was declared and aircraft landed at 1956z without further incident.
TSB A13A0092: The Gulfstream Aerospace G-IV aircraft, registration N808MF, was on a flight from Naples, Italy to Bangor, Maine. While at FL430 in cruise flight, approximately 150 nm west of Mary's Harbour, NL a squeal noise began and increased in volume until a pop was heard and an immediate increase in cabin altitude began. The crew contacted Gander ACC to report the problem; then requested and received clearance to descend to FL240 and divert to Gander, NL (CYQX). Cabin altitude could be maintained at the lower flight level. The flight landed at CYQX without incident. Maintenance discovered a damaged entry door seal rain guard.

July 14, 2013

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

A Mexico Registered Gulfstream Aerospace Gulfstream 5 G-1159D (GLF5) enroute from Marseille Provence Airport, France (LFML) to Adolfo Lopez Mateos International Airport, Mexico (MMTO) was at FL430 and flight planned over JEBBY. The Moncton controller coordinated an altitude of FL450 with New York Oceanic controller but did not clear the aircraft to FL450. The aircraft progressed JEBBY at FL430. No other aircraft were in the area and no impact on the operation.

May 10, 2013


An Austria corporately registered Bombardier BD-700-1A10 (GLJ32DD) from Charleston, SC (KCHS) to Nice (LFMN) received an oceanic clearance from Gander Clearance Delivery and started to climb from FL410 to FL430 wrong way. Moncton controller observed the aircraft through FL416 and queried the crew. The crew was informed that the oceanic clearance was not an ATC clearance to climb while in domestic airspace. The Aircraft was given climb to FL430 and coordinated with Gander ACC. No other traffic and no affect on operations.

April 18, 2013


An Executive Jet Management Gulfstream G5 (EJM312) from KTEB to EIDW reported continuous moderate-severe turbulence FL430. Climbed to FL450, reported smooth ride.

July 5, 2012

Incident at over Toronto

The American, corporately-registered Key Equipment Finance Inc. (c/o PCMT Aviation LLC) Cessna 750 aircraft (N747XJ) was on an IFR flight from Brunswick Executive Airport, ME (U.S.A.) (KBXM) to Denver (Rocky Mountain) Metropolitan Airport, CO (U.S.A.) (KBJC). The aircraft was passing overhead of Toronto when the flight crew advised the Toronto ACC Sector Controller of a cracked windshield and declared an emergency at 2339Z. The aircraft descended from FL430 to an altitude of 9,000 feet and the flight crew elected to divert to land at Buffalo (Niagara) International Airport, NY (U.S.A.) (KBUF). The aircraft re-entered American air space at approximately 2354Z. Ops. impact -- unknown.

March 8, 2012

Incident at 20NM north of London International Airport on J16 (Conflict - loss of separation, ATS operating irregularity)

UPDATE According to the TSB Final Report A12O0030 authorized for release on 21 June 2013: A Cessna Citation X (registration N217AL, serial number 750-0217), operated by XO Jet, was on an instrument flight rules flight from Norman Y. Mineta San Jose International Airport in San Jose, California, to Laurence G. Hanscom Field Airport in Bedford, Massachusetts. The aircraft was cleared by Oakland Air Route Traffic Control Center to maintain flight level 430, an altitude normally reserved for westbound aircraft. A Gulfstream V (registration N128GV, serial number 665), operated by Executive Jet Management, was on a westbound instrument flight rules flight from Bradley International Airport in Windsor Locks, Connecticut, to San Francisco International Airport in San Francisco, California, and was also cleared to maintain flight level 430. The routing for both aircraft included the portion of J16 airway between Peck VOR (very high frequency omnidirectional radio range) and London VOR on reciprocal tracks. At 1342 Eastern Standard Time, the 2 aircraft responded to traffic alert and collision-avoidance system resolution advisories, and passed each other separated by 1 nautical mile laterally and 900 feet vertically. No damage or injuries occurred.
UPDATE Supplemental information received from T.S.B. Daily Notification [#A12O0030]: The American, privately-operated Xojet, Inc. Cessna 750 aircraft (N217AL) was en-route between San Jose, CA (U.S.A.) (KJSC) and Bedford, ME (U.S.A.) (KBED) at FL430. The American, privately-operated Gulfstream V aircraft (N128GV) was en-route between Bradley-Windsor Locks, CT (U.S.A.) (KBDL) and San Francisco International Airport, CA (U.S.A) (KSFO) at FL430. 20NM northwest of the London VOR (YXU) on airway J16, the two aircraft crossed paths separated by one (1) mile laterally and 900 feet vertically, in an area where five (5) miles lateral or 2,000 feet vertical separation is required. Transport Canada will appoint a Minister's Observer for this occurrence.
The American registered to Xojet Inc. Cessna 750 (N217AL) was on an IFR flight from Norman Y. Mineta San Jose International Airport San Jose, California, USA (KSJC) to Laurence G Hanscom Field Airport Bedford, Massachusetts, USA (KBED). The American registered to Wilmington Trust Co Trustee Gulfstream G-V (N128GV) was on an IFR flight from Bradley International Airport Windsor Locks, Connecticut, USA (KBDL) to San Francisco International Airport San Francisco, California, USA (KSFO). Separation was not assured between N2171L and N128GV at FL430 20 northwest of YXU J16.

April 21, 2011

Incident at over southern Ontario (Communication navigation surveillance/air traffic system)

Initial information received from the Federal Aviation Administration: The American, corporately-registered Blakenergy Aviation LLC Gates Learjet 55 aircraft (N551MF) was on an IFR flight from Houston to Montréal. The Federal Aviation Administration reported that the aircraft was out of radio contact with ATC for 45+ minutes. The aircraft entered Canadian airspace north of Cleveland, OH, on course at FL430. Attempts were made to contact the flight crew on the emergency frequency, the Guard frequency and via ROD VORTAC. Contact was re-established with the flight crew at 2032Z by Cleveland ARTCC staff. The flight crew acknowledged the frequency change from ZME-ZID. Facility reporting was timely. The Federal Aviation Administration noted that a pilot deviation report would be filed.

March 19, 2011

Incident at 54N 50W

A privately operated Dassault Falcon 2000EX, enroute from London (EGGW) to Teterboro (KTEB) at 43,000 ft., reported 40W with 11 minutes spacing with traffic following at same speed. At 50W spacing had reduced to eight minutes where 10 minutes separation was required with the following traffic. The pilot advised that the aircraft flight management system had reduced the speed automatically. The aircraft was re-cleared to M080. TSB Case Closed.
UPDATE TSB: A11A0009: The privately operated Dassault Falcon 2000EX, was on a flight from London, England to Teterboro, New Jersey and cruising at FL430 with traffic following at 11 minutes lateral spacing. At approximately 350 nm northeast of Gander, NL spacing was noticed to have reduced to 8 minutes where 10 minutes is required. The pilot reported that the aircraft flight management system had reduced the speed and was subsequently given an airspeed clearance to provide and maintain separation.

August 18, 2009

Incident at 25 NM Northeast of Nanaimo (Communication navigation surveillance/air traffic system, ATS operating irregularity)

UPDATE / Add Info from TSB: A09P0263 - The corporate Grumman GLF4 aircraft, N904TC, was en route from Aspen, Colorado to Kenai, Alaska at FL430. The aircraft was handed off from Seattle to Vancouver North but the altitude on the data strip was FL400. The aircraft was subsequently handed off to Vancouver West but the West Controller was not advised of the revised altitude. On initial contact the West Controller became aware of the revised altitude and revised the strip, but an operating irregularity had occurred and safety was not assured.
The private American-registered Tersoro Aviation Co. Gulfstream IV, was on an IFR flight from Aspen CO (KASE) to Kenai, AK (PAEN), and was at FL430 at the time the handoff occurred between Seattle and Vancouver North. Original altitude on the flight data strip was FL400. The West Sector was not advised of the revised altitude. The West Sector Controller, on initial contact with aircraft, became aware of the revised altitude. There was no operational impact.

August 6, 2009

Incident at 28NM north of Buffalo (ELT)

NAV CANADA staff at Toronto ACC received two (2) reports of an active ELT signal from the flight crews of two (2) overflying aircraft: EJA313, westbound at FL430, reported hearing a strong ELT signal 28NM north of Buffalo at 1424Z. The signal abruptly ended at 1426Z when the aircraft was 31NM north of Buffalo. UAL664, westbound at FL380, reported hearing a strong ELT signal 40NM west of Buffalo at 1424Z. The signal abruptly ended at 1426Z when they were 55NM southwest of Buffalo. Source unknown.

September 9, 2008

Incident at South and West of London (ELT)

ELT reports received by Toronto ACC and London FIC, ASH7051 FL340 10 West YXU, EJA253 FL430 TEB BFI 45 SE ECK, NOJ10 40 S YXU CNS7 PDK FL340, N620TC 10 SE YZR 140 descending to DET all reported strong ELT. RCC advised.

May 19, 2008


While enroute at FL430 the pilot advised of pressurization difficulties and requested a rapid descent to 14,000ASL. No assistance was required and N473KT landed Calgary without incident at 2335z.

December 12, 2008

Incident at 46N040W 0104 44N050W 0220 FL430

UPDATE TSB: A08A0158: A G450 aircraft, registration N500J, was in cruise at FL430 from Shannon, Ireland to West Trenton, NJ when, at 2128 AST, the crew requested a descent to FL380 and the aircraft was cleared for the descent. At 2133 the crew declared an emergency due to low fuel temperature and possible ice in the fuel, and requested further descent to FL350. The aircraft was cleared to descend to FL 360, due to traffic at FL350. No further assistance was required.
An American registered Gulfstream G4, enroute from Shannon (EINN) to Trenton (KTTN), declared an emergency due to low fuel temperature and possible icing in the fuel. The aircraft requested descent to 38,000 ft and again to 35,000 ft. Air Traffic Control (ATC) clearance was issued to maintain 36,000 ft. (traffic at 35,000 ft). The aircraft made contact with Gander High domestic on VHF at 02:19Z. No further assistance was required. TSB Case Closed.

June 24, 2007

Incident at vicinity of Windsor (ELT)

NAV CANADA staff at Toronto ACC were advised by Windsor Airport (CYQG) control tower staff of a strong ELT signal on a bearing of 150º from the airport. The signal ended at 0043Z. The flight crew of BAW24R reported hearing an active ELT signal 0025Z when they were 20NM north of KLANT intersection at FL350. The pilot of N54DC reported hearing an active ELT signal at 0025Z while over North Bay at FL430.

October 17, 2006

Incident at LOGSU (Moncton ACC)

N534QS, Gulfstream G5, enroute to Le Bourget (LFPB), received an oceanic clearance from Gander, clearance delivery in part "After LOGSU maintain FL450". Aircraft then returned to Moncton ACC frequency and advised controller "We've just received our clearance and we're leaving FL430 for FL450" The Moncton controller immediately corrected the pilot, prior to the aircraft vacating the altitude. The procedure requires that the pilot obtain a further clearance to the oceanic altitude after receiving oceanic clearance. The controller verified that the aircraft was requesting 45,000 ft. at that time, and subsequently cleared the aircraft up. Nil TSB.

June 11, 2006

Incident at 52N 40W, FL430

At 11:06Z N526EE, Gulfstream G5 enroute from Farnborough (EGLF) to White Plains (KHPN) at position 52N 40W, FL430, reported a crack in the outer windscreen and requested descent to 35,000 ft. or lower. ATC was initially unable to issue a descent clearance due to the opposite direction traffic. At 11:20Z clearance was issued to descend to 35,000 ft. with an advisory of lower flight levels available. N526EE elected to maintain 35,000 ft. and continued to destination without incident. Nil TSB.

August 2, 2005

Incident at FL430 entroute from Prince Rupert - Los Angeles (ATS operating irregularity)

N413QS an American registered Gulfstream G-IV at FL 400 was given FL430 in error due to N516QS on frequency level FL430. Controller misheard N413QS checking in at FL 400 and acknowledge FL430. The pilot of N 413QS then acknowledge FL430 and climbed.The controller observed opposite direction traffic closing when N 413QS reported a TCAS RA. The aircraft were separated by required separation both laterally (approx 7 nm)and vertically (1900 feet) when the passed each other.

November 5, 2004

Incident at 50N050W 10 minutes East (Conflict - loss of separation, ATS operating irregularity)

VPCVL, a Lear 45, was routing KOBEV 50N050W 52N040W at FL450. N283S, a Bombardier Global Express, was routing 51N040W 50N050W KOBEV at FL430. Shortly after passing 50W VPCVL was observed in descent. The pilot was contacted and was instructed to return to FL450 due to traffic. The pilot had descended to FL440 and then returned to FL450 as instructed and advised ATC that he had descended due to a weight problem. The westbound traffic (N283S) had been cleared to FL390 as a precaution. Update: During the course of the in-depth ATC investigation, that followed, it was revealed there was ATS involvement with a loss of separation. TSB Evaluating

February 16, 2004

Incident at GOOSE BAY NL (CYYR)

TSB Update - A corporate aircraft call sign LX-PAT type LearJet31A was enroute Sondre Stromfjord to Goose Bay at FL430. At 1445Z position 4640N 6230W the crew declared an emergency due to warm air temperature and unable to maintain assigned altitude. ATC was unable to provide descent clearance due to traffic but advised that FL270 would be available. Crew advised that they were in an emergency descent following flight contingency procedures. Aircraft reported at FL270 and was cleared to Goose Bay. Flight landed without further incident 1541Z.
AT 1445Z LXPAT a LearJet31 AT FL430 routing SF 60N/55W (1425Z) PORGY (1500Z)declared an emergency due to warm air temp and advised that they must descend as soon as possible. ATC was unable due to traffic at FL380,350, 330 and 280. The aircraft was advised that an IFR clearance would be available at FL270. The aircraft then reported they were in an emergency descent following in flight contingency procedures. The aircraft reported at FL270 at 1455Z and ATC clearance direct Goose Bay was issued. The aircraft landed Goose Bay at 1541Z.

August 20, 2003

Incident at VANCOUVER INTL BC (CYVR) (ATM - other)

N404XT a Gulfstream 4 at FL430 nowthwest bound on an IFR flight plan was apparently NORDO. Seattle advised no contact. The aircraft crossed the US/Canada border at 0035Z. Calls were made on all frequencies including 121.5. Aircraft was not squawking 7600. NORAD advised. Aircraft contacted at 0115Z Pilot advised he must of missed a frequecy change.

March 24, 2003


A Gulfstream 4 enroute from Gander to Teterboro at FL430 reported a cracked windshield in the vicinity of Stevenville Nfld. And requested descent to FL250. N493QS continued to destination and exited Canadian airspace at 1631Z. RCC was advised. TSB - NIL

March 11, 2002

Incident at 120 west of Toronto (CYYZ) (ATS operating irregularity)

120 west of Toronto (CYYZ) - At approximately 1400Z, Cleveland Centre advised Toronto Centre that Steelhead ATCAA would be active from FL180 to FL500 between 1500Z and 1630Z. This information was not posted to the sectors until 1500Z. Once informed it was active, ATC sterilized the aispace but Air Canada flight 791 (ACA791) was in Steelhead (FL390) until 1500:36 and N260CH was in Steelhead (FL430) until 1501:48.