August 1, 2017

Incident at 5140N / 11343W (ELT)

A Canadian North Inc. Boeing 737-700 (MPE1602) heard a strong emergency locator transmitter (ELT) signal climbing through FL215. The signal was lost 3 minutes later ,55 miles north of Calgary, AB (CYYC) climbing through FL295.

March 1, 2014

Incident at 80 SE CALGARY INTL AB (CYYC)

UPDATE: TSB Report#A14W0031: The Air Canada Embraer ERJ 190-100 IGW (C-FHNP) was operating as flight ACA196 from Kelowna (CYLW) to Toronto (CYYZ). In the climb through FL295, the crew received an EICAS warning for an over wing emergency exit. The QRH checklist was actioned and a visual inspection of the door was completed. Cabin pressurization remained normal throughout the flight. The crew elected to divert to Calgary (CYYC) and declared a precautionary PAN PAN. ACA196 landed without further incident with ARFF on standby. Maintenance carried out door handle operational checks and confirmed normal operation.
TCU advised an Air Canada Embraer E190 (ACA196) from Kelowna, BC (CYLW) to Toronto, ON (CYYZ) was 80 miles southeast of Calgary, AB (CYYC) diverting due to a pressurization door indication, declared and "PAN". ARFF dispatched. Landed runway 17R at 2301Z. No impact on operations.

June 29, 2012

Incident at 18NM northeast of Sault Ste. Marie Airport (CYAM) (Communication navigation surveillance/air traffic system)

The Air Canada Airbus A-320 aircraft (operating as flight ACA116) was on a scheduled IFR flight from Vancouver International Airport (CYVR) to Toronto (LBPIA) (CYYZ). NAV CANADA staff at Toronto ACC reported that at 2014Z, the ACA116 flight crew was cleared to descend from FL370 to FL350. The flight crew read back the clearance correctly. At 2016Z, ACA116 was observed (on radar) descending through FL295 without clearance. When questioned, the flight crew confirmed FL295 and advised that they were climbing back to FL350 again (without clearance). Ops. impact -- none.

May 31, 2008

Incident at 65NM west-northwest of Toronto (Other operational incident, ATS operating irregularity)

*** Note:*** this occurrence was also reported as A.O.D.R. 94378-V2. The Air Canada [type of aircraft data not supplied by NAV CANADA] aircraft (operating as flight ACA103) was on a scheduled IFR flight from Toronto (LBPIA) (CYYZ) to Vancouver International Airport (CYVR). The Pinnacle Airlines, Inc. Bombardier CL-600-2C10 (RJ700) Regional Jet aircraft (operating as flight FLG4755) was on a scheduled IFR flight from Rochester (Greater Rochester) International Airport, NY (U.S.A.) (KROC) to Minneapolis-St. Paul (Wold Chamberlain) International Airport, MN (U.S.A.) (KMSP). FLG4755 was level at FL300 while ACA103 was climbing to FL290 to cross under FLG4755 (approximately 65NM west-northwest of Toronto). After ACA103 was level at FL290, a conflict alert activated and radar indicated FL295 for 10 seconds. Both flight crews confirmed that they were level at their respective altitudes and did not receive any alerts. This was a system anomaly and a loss of separation did not occur.

February 6, 2005

Incident at about 30NM east of London (ATS operating irregularity, ATM - other, ATM - NAVAIDS/radar)

The AMR American Eagle Airlines Inc. Embraer EMB-146ER aircraft (N674RJ, operating as EGF4248) was on a scheduled IFR flight from Rochester Airport, NY (U.S.A.) (KROC) to Chicago (O'Hare) International Airport, IL (U.S.A.) (KORD). The (Air Canada) Jazz Air Limited Partnership Canadair Regional Jet aircraft (C-GKEU, operating as JZA8678) was on a scheduled IFR flight from Toronto (LBPIA) (CYYZ) to Dallas (Fort Worth) International Airport, TX (U.S.A.) (KDFW). EGF4248 was level at FL300 westbound, approximately 30NM west of London. JZA8678 was climbing to FL290 to pass under EGF4248. Out of approximately FL280 - the NAV CANADA sector controller had a ""CON"" alarm with conflict altitude FL295 highlight (blocking out actual altitude of JZA8678). The Sector Controller confirmed the aircraft altitudes but found this to be extremely disturbing. It was reported that this type of occurrence - directly to CON - happens repeatedly with system confidence being badly undermined. NAV CANADA staff examined the radar data on the Toronto, London and Hamilton sources and no altitude errors were observed. JZA8678 climbed to and maintained FL290. The RSiT tape has been secured.

March 8, 2004

Incident at SMITHERS BC (CYYD) (ATS operating irregularity)

At approximately 1920Z Zip Air flight WZP6344, a Boeing 737-200 had just progressed the Smithers (YYD) VOR enroute from Vancouver to Whitehorse. This aircraft is not RVSM capable so was issued descent as follows: ""Maintain FL280 descent at pilots discretion, cross DUXAR at FL280."" The clearance was read back by WZP6344. A position handover occurred. The new controller was advised of and acknowledged that WZP 6344 had received descent clearance with crossing restriction but had not yet been issued communication instructions. With WZP 6344 approximately 80NM north of YYD communication instructions were provided to the aircraft along with a reminder to cross DUXAR at FL280. WZP6344 responded that he ""checked remarks"". 1943Z (approx): Controller observed WZP6344 approximately 2NM south of DUXAR at FL300. A transmission was made to WZP6344 to confirm descent would begin. No response was heard from the aircraft, however WZP 6344 was observed to immediately commence descent. WZP6344 crossed the FIR boundary at FL295 and subsequently leveled FL280 approximately 10NM north of the FIR boundary. The EG sector controller was advised of this occurrence and stated that there was no operational impact.

November 30, 2000

Incident at near Ottawa (TCAS alert, Other operational incident, Conflict - potential)

AFL304 AIRBUS A310 AEROFLOT IFR from Toronto (LBPIA) (CYYZ) to Moscow (Sheremetyevo) International Airport, Russian Federation (UUEE) CIC235 AIRBUS A30B I.C.C. CANADA IFR cargo flight from Montréal International (Mirabel) Airport (CYMX) to Dayton (James M. Cox Dayton International) Airport, OH (U.S.A.) (KDAY) A TCAS alert caused the flight crew of AFL304 to initiate a climb from level flight at FL290 to FL295. Traffic, CIC235 (which had been passed to them previously) was at their 12 o´clock position and approximately 10 miles, opposite direction, climbing to FL280. No other traffic was in the vicinity. Ops. impact -- unknown.

June 1, 2000

Incident at Gander Oceanic (CYQX)

ESKAN71 LR35 FL290 reported at 5418N03743W that a DC10 at FL295 Westbound was 500 feet above the flight and that theyhad visually avoided the DC10. ATC advised that there was no known traffic in the vicinity above the flight. Possible traffic was GCO21 DC10 FL280 rout;ing 55/30 0448 54/40 0534 52/50 0623. When asked the GCO21 confirmed maintaining FL280. At 0620z checking with ESKAN71 through Shanwick, the flight advised he had also received a TCAS Alert. TSB Evaluating. TSB file # A00A0089

April 16, 1994


The aircraft was eastbound on an assigned heading, climbing from FL300 to FL330 when a resolution advisory was received due to westbound traffic at FL310, five (5) to six (6) miles north of FAB990. FAB descended to FL295. Ops. impact -- none.

July 6, 1994

Incident at S Heath Point

Aircraft enroute Mildenhall to Dover was unable to maintain pressurization due to loss of pressure pack. Aircraft unable to communicate with Moncton so squawked 7700 and descended. Aircraft was able to communicate with Moncton as it descended through FL295 and was approved for FL200. Aircraft continued to Dover. No conflictions.