At Kitchener/Waterloo, ON (CYKF), the control tower opened late due to staffing shortages. The CYKF Class C airspace reverted to Class E for approximately 3 hours. Impact unknown.

At Kuujjuarapik, QC (CYGW) the original NOTAM for Runway 03/21 indicated that the runway was closed from 140000Z to 141900Z. At approximately 1420Z, a replacement NOTAM (NOTAMR) was received indicating that Runway 03/21 was closed until 141700Z. At 1523Z, a cancellation NOTAM (NOTAMC) was received indicating that Runway 03/21 was open (Quebec City (YQB) flight information centre (FIC) was advised by e-mail by the Kativik Regional Government (KRG) and Kuujjuaq; ground personnel not advised). An Air Inuit Ltd. de Havilland DHC-8-314 (C-FOAI/AIE802), from Montréal/Pierre Elliott Trudeau, QC (CYUL) to Kuujjuarapik, QC (CYGW) landed on Runway 03 at 1647Z when the runway was considered officially open. At 1650Z, a vehicle (ST32) requested permission to drive on the runway to finish the work. The vehicle was not aware that Runway 03/21 was reopened as of 1523Z. Runway 03/21 closed from 1650Z to 1705Z by NOTAM via voice communication.

A WestJet Encore Ltd. de Havilland DHC-8-402 (WEN3270) from Calgary, AB (CYYC) to Regina, SK (CYQR) departed, then reported a pressurization issue and requested to return to CYYC, with no assistance required. The tower contacted the Security Operations (IOC) unit with a code orange. The aircraft landed safely at 0141Z. No impact to operations.
UPDATE from Airworthiness: A Civil Aviation Safety Inspector (CASI) looked into this occurrence. On climb-out through approximately 10,000, the crew received a fuselage door warning light. The aircraft levelled at 13,000 to carry out the checklist. The right-hand (RH) emergency exit (E-exit) door was indicating "open" on the doors page. At 13,000, the cabin altitude (ALT) was reading 4000 ground level. Operations (OPS) check of the forward (FWD) E-exit door was accomplished in accordance with (IAW) aircraft maintenance manual (AMM) 52-24-00, with no fault found. Proximity Sensing Electronics Unit (PSEU) values checked IAW AMM 32-61-00, with no faults found for the E-exit door. Pressurization run carried out (C/O) IAW AMM 21-31-00. No faults found. Aircraft is serviceable at this time.

The CYGT community aerodrome radio station (CARS) missed two weather observations. The CARS of CYXN had no (NIL) weather (WX) observations published from 1300Z to 1400Z. The stations were called, with no response heard (NRH). The stations were closed via NOTAM at 1419Z. Subsequently, CYXN was opened and a cancelling NOTAM (NOTAMC) was issued at 1607Z. The CARS of CYLK did not publish weather observations from 1500Z until 1600Z. The station was called, with NRH. The station was closed via NOTAM (i.e. NOTAMed closed) at 1616Z.

The community aerodrome radio station (CARS) of Igloolik, NU (CYGT) missed its first two observations. At 1215Z, the station was closed via NOTAM from 1000Z to 2100Z. CYGT then called to open. NOTAM cancelled. At 1452Z, the CARS of Naujaat, NU (CYUT) was closed from 1145Z to 2215Z. CYUT then called to open at 1330Z. NOTAM cancelled. The CARS of Aklavik/Freddie Carmichael, NT (CYKD) missed its first two observations. At 1415Z, the station was closed via NOTAM from 1300Z to 2300Z. CYKD opened the station at 1552Z. The CARS of Lutselke, NT (CYLK) missed its first two observations. At 1520Z, the station was closed via NOTAM from 1400Z to 0000Z. The CARS of Wrigley, NT (CYWY) missed its first two observations, and was closed via NOTAM from 1200Z to 2200Z at 1520Z. CYUT hours of operations were extended, and a NOTAM was issued from 0124Z to 0520Z. The CYUT call out was subsequently ended, and the NOTAM was cancelled.

The community aerodrome radio station (CARS) at CYZS advised the station opened at 1244Z. NOTAM cancelled. The CARS at CYUT advised opening at 1430Z. NOTAM issued. The CARS at CYHI advised it was closed. NOTAM issued for closure. The CARS at CYKD was closed due to missed weather, NOTAM issued. The CARS at CZFM was closed due to missed weather, NOTAM issued. CZFM CARS open at 1555Z; NOTAM cancelled. The CARS at CYRA was closed due to missed weather, NOTAM issued. The CYRA CARS was open from 1600Z to 0000Z. The CARS at CYLK was closed due to missed weather, NOTAM issued. The CARS at CYGT extended its hours from 2155Z until 0200Z. NOTAM issued.

The Regina, SK (CYQR) tower was not operating as per published hours. The tower opened at 1245Z as opposed to the published opening time of 1200Z. Alternate services provided (Class E) by the Regina flight service station (FSS).

A privately registered Aero Commander 112TC on a flight from Edmonton, AB (CYEG) reported issues with the door and window, advising that, as a result of these issues, it was very cold in the cabin. The aircraft requested a straight-in approach for Runway 30 at Grande Prairie, AB (CYQU). No other assistance was required. The aircraft landed safely at 1823Z. No impact on operations.

The Montreal/Mirabel, QC (CYMX) control tower opened 35 minutes late, at 1135Z. Impact: Advisory service hours were extended to 1135Z and airspace was temporarily changed to Class E.

The control tower at Edmonton/Villeneuve, AB (CZVL) opened 12 minutes late. Airspace remained Class E.

No impact on operations as a result of the Fort McMurray, AB (CYMM) tower opening late, according to the Peace River flight service station (FSS). Class E from 1300Z to 1445Z.

All runways and Taxiways J, A, E, F and G were closed due to foreign object debris (FOD) created by an Atlas Air Boeing 747-400 (N415MC/GTI551) on a flight from Halifax/Stanfield Intl, NS (CYHZ) to Anchorage, AK (PANC) that taxied for and departed Runway 23. Runway 14/32 open at 0717Z. Runway 05/23 open at 0754Z. No aircraft delayed.

A privately registered Cessna 210A disappeared from radar and went no radio (NORDO). A prime target was observed inbound to Toronto/Buttonville Municipal airport, ON (CYKZ) on the approximate route the Cessna 210A would follow. The tower stayed open late to ensure the Cessna 210A landed safely using the light gun.

UPDATE: TSB Report#A18O0006: C-GBZR, a Boeing 767-38E aircraft operated by Air Canada rouge, was conducting flight ROU1823 from Toronto/Lester B. Pearson Intl., ON (CYYZ) to Honolulu/Daniel K. Inouye Intl., Hawaii (PHNL) with 8 crew members and 274 passengers on board. During climb, the flight crew selected the landing gear up, and received a GEAR DISAGREE EICAS message. The crew noticed that the left main landing gear was indicating green, with a door open indication. The aircraft climbed to 9000 feet ASL, and orbited north of CYYZ where the crew declared a PAN PAN before returning to CYYZ. The operator?s maintenance performed several cycles of the landing gear, and determined that the left main landing gear actuator was unserviceable. The actuator was replaced and subsequent cycles determined that no further fault existed.
An Air Canada Rouge Boeing 767-38E (C-GBZR/ROU1823) on a flight from Toronto/Lester B. Pearson, ON (CYYZ) to Honolulu, HI (PHNL) declared a PAN PAN after departing Runway 23 due to a possible gear door issue. The aircraft requested Aircraft Rescue and Fire Fighting (ARFF) and landed Runway 23 at 0240Z without incident.

A Calgary Flying Club Piper PA-34-200T (C-GXAR) from Calgary/Springbank, AB (CYBW) to Calgary/Springbank, AB (CYBW) departed on an IFR training flight. Two minutes after departure, C-GXAR informed departure that they needed to return due to an open door. C-GXAR cancelled IFR and joined the circuit. No impact on operations.
UPDATE from Flight Operations: A Civil Aviation Safety Inspector (CASI) looked into this occurrence. Door became unlatched inflight. Aircraft returned and landed to address the unlatched door issue.

The community aerodrome radio station (CARS) at CYLK open from 0400Z to 0700Z.

The CYLK community aerodrome radio station (CARS) opened one hour late.

The community aerodrome radio station (CARS) at CYLK did not open for published hours from 1500Z to 0100Z.

A privately registered Cozy III, on a local flight from Mont-Joli (CYYY), QC, left Runway 06 via Taxiway C (closed). The flight service station (FSS) confirmed that the Cozy III was clear for the arrival of a privately registered Cessna 172N, from Chicoutimi (CYRC), QC, to Mont-Joli (CYYY), QC. The Cessna 172N landed. The FSS asked the two aircraft to backtrack on Runway 06 in order to leave at Taxiway G (open). An Air Cadet League of Canada Cessna 305A (C-FTGC/ SDOG60), on a local flight from Mont-Joli (CYYY), QC, was advised and confirmed that it would lengthen its flight to enable the two aircraft to backtrack and leave the runway. The Cessna 172N did not respond to the request to backtrack on the runway and headed to Taxiway C (closed) and then to Taxiway D (closed). Glider landing activities were taking place on Taxiway D (closed). The people responsible for glider activities on Taxiway D notified the FSS that they had indicated to the Cessna 172N to reintegrate Runway 06 via Taxiway E (closed) since an Air Cadet League of Canada Schweizer SGS2-33A (C-FZIQ), on a local flight from Mont-Joli (CYYY), QC, was inbound for landing on Taxiway D (closed). The Cessna 172N and the Cozy III eventually left Runway 06 on Taxiway G (open). It was not possible to contact the Cessna 172N during ground taxi.

An Air Canada Embraer E190 (ACA513) on a flight from Toronto/Lester B. Pearson, ON (CYYZ) to Chicago/O'Hare, IL (KORD) declared Pan Pan and advised of an open door indication. The flight requested to return to Toronto.
UPDATE: TSB Report#A17O0117: The Air Canada Embraer E-190 aircraft (AC513, C-FNAW) was on the climb out from Lester B. Pearson Intl Toronto (CYYZ) when the crew received an unsafe main cabin door indication, followed by the crew not being able to pressurize the aircraft. A PAN PAN was declared with ATC and the aircraft returned to CYYZ. The landing was uneventful with ARFF on stand by. Maintenance replaced the Proximity Sensor Electronic Module 1 (PSEM) IAW AMM Task 32-61-01 PB 401 and system was checked serviceable. The aircraft was returned to service.

Tower opened late at 1422Z while the airspace remained Class E. No operational impact.

1400Z and 1500Z weather observations were missing. NOTAM issued. The community aerodrome radio station (CARS) at CYLK opened at 1641Z. NOTAM cancelled.

CYLK community aerodrome radio station (CARS) was not open during published hours.

TSB Report#A17W0106: an Amateur Built Just Aircraft Highlander, had departed from Ponoka Industrial (Labrie Field), AB (CEH3) for a private farm strip about 3 nautical miles East of CEH3. Shortly after leveling off after takeoff, the pilot heard a bang from the engine (Rotax 914 EFI/Turbo) and a strong smell of oil. The pilot headed for an open field and, during the descent, saw flames coming from the engine cowling area. The engine was shut down and the descent speed was increased in an attempt to extinguish the flames; however, that was unsuccessful. The pilot completed a forced landing and, after evacuation, attempted to extinguish the fire without success. The fire consumed the entire aircraft except for the vertical and horizontal stabilizers. Regional fire fighting services were on scene within 10 minutes. The pilot, who was the sole occupant, was uninjured.

The community aerodrome radio station (CARS) at CYLK was closed during published open hours from 1500Z to 2000Z.

The community aerodrome radio station (CARS) at CYLK did not open. CARS observer/communicator called to NOTAM the station closed until July 13th 2017 at 0000Z.

The community aerodrome radio station (CARS) at CYLK did not open. NOTAM issued and reported to National Systems Control Centre (NSCC).

A privately registered Piper PA-34-200T, on a local flight form Calgary/Springbank, AB (CYBW) departed Runway 26 and had to return to land due to an open door. No operational impact.

The following community aerodrome radio station (CARS) were not operating on published hours for calendar day April 15th, 2017. CYGZ CARS NOTAM'd closed. CYGH CARS late opening and NOTAM'd closed 4 hours early. CYSY CARS NOTAM'd closed. CYGT CARS NOTAM'd extended hours from 1100Z to 1500Z and 2030Z to 0130. CYLK CARS NOTAM'd closed. CYRA CARS NOTAM'd closed.

The following community aerodrome radio station (CARS) were not operating on published hours for calendar day April 21st, 2017: CYGT CARS NOTAM closed. CYGZ CARS NOTAM closed. CYPC late opening. CYSY closed early. CYLK late opening.

The following community aerodrome radio station (CARS) were not operating on published hours for calendar day April 18th, 2017. CYSY opened from 1100Z to 1300Z and from 2300Z to 19/0700Z. CYLK closed from 1400Z to 0000Z.CZFN closed from 1500Z to 2300Z.

The community aerodrome radio station (CARS) at CYJF closed from 1400Z to 2200Z. CYLK CARS closed from 1400Z to 1500Z and 2200Z to 0000Z. CYGZ CARS closed from 2100Z to 0000Z. CYGT opened from 2200Z to 0100Z. CYHK opened from 0100Z to 0400Z.

CYJF community aerodrome radio station (CARS) closed from 1400Z to 2200Z. CYLK CARS closed from 1400Z to 1600Z. CYHI CARS open from 0900 to 1200Z.

The following community aerodrome radio stations (CARS) were not operating on published hours for calendar day April 6th, 2017: CYGZ CARS 1 hour late opening. CYLK CARS late opening. Opened at 1735Z instead of at 1400Z. CYRA CARS 52 minutes late opening. CYFR CARS closed 6 hours early at 1600Z.

The following community aerodrome radio stations (CARS) were not operating on published hours: CYGT did not open, NOTAM'ed closed. CYGH NOTAM'ed closed from 1800Z to 2300Z by Observer/Communicator (O/C) request. CYLK missed first two weather observations. NOTAM'ed closed. CZFN NOTAM'ed closed by air traffic service (ATS). CYRB closed by NOTAM until 031400Z, did not open. NOTAM'ed closed until 041400Z. Site opened at 1816Z, NOTAM cancelled. CZFM extended hours of operations from 1230Z to 1300Z by O/C request.

The following community aerodrome radio station (CARS) were not operating on published hours: CYGT missed the first three weather observations; NOTAM'd closed at 1115Z. Site re-opened and NOTAM cancelled at 1245Z. CYGZ NOTAM'd closed due to no weather observations. CYSY NOTAM'd closed from 2000Z to 2300Z by Observer/Communicator (O/C) request. CYLK missed the first two weather observations; NOTAM'd closed at 1520Z. Site re-opened and NOTAM cancelled at 1611Z. CYHI missed first weather observation.CYWY NOTAM'd closed by O/C request.

The following community aerodrome radio station (CARS) were not operating on published hours: CYGT was late opening, hours of operations from 1319Z to 2000Z vice 0900Z to 2000Z. CYBB missed 2300Z weather observation, extended hours of operations from 0000Z to 0300Z. CYLK missed first weather observation. CYGZ NOTAM'ed closed from 1700Z to 0000Z by observer/communicator (O/C) request.

On March 28th 2017 the following community aerodrome radio stations (CARS) were not operating on published hours: CYGT NOTAM'ed closed due to no weather observations. CYHK missed first two weather observations, site NOTAM'ed closed. Site opened 1345Z, NOTAM cancelled. CYBB hours of operations extended from 0100Z to 0200Z. CYLK NOTAM'ed closed due to no weather observations.

The following community aerodrome radio stations (CARS) were not operating on published hours for calendar day March 27th 2017: CYLK CARS NOTAM closed from 1400Z to 0000Z. CYGT CARS 3 hours late opening.

On March 23rd 2017 the following community aerodrome radio station (CARS) were not operating on published hours: CYGT closed from 09001Z to 2000Z. CYPC opened from 0000Z to 0100Z. CYLK closed 1400Z to 0000Z. CZFN closed from 1500Z to 2300Z.

The following community aerodrome radio station (CARS) were not operating on published hours for calendar day March 17th 2017: CYGT 2 hours late opening. CYGZ closed 1 hour early. CYHK NOTAM closed from 1200Z to 0000Z. CYLK NOTAM closed from 1400Z to 0000Z. CYHI NOTAM closed 1 hour early. CYWY NOTAM closed from 1400Z to 2200Z.

On March 12th 2017 the following community aerodrome radio station (CARS) were not operating on published hours: CYPC was NOTAM closed from 1300Z to 1800Z then NOTAM open from 1900Z to 2100Z. CYSY NOTAM closed from 1300Z to 1800Z. CYLK NOTAM closed from 1400Z to 0000Z. CYGT NOTAM closed from 1600Z to 2030Z but was opened from 1900Z to 2300Z for a callout.

The following community aerodrome radio stations (CARS) were not operating on published hours: CYUX NOTAM'ed closed from 1200Z to 0000Z by Observer/Communicator (O/C). Site opened at 1600Z. CYGH extended hours of operations from 0100Z to 0300Z. CYLK NOTAM'ed closed due to no weather observations. CYHI extended hours of operations from 0100Z to 0200Z.

The following community aerodrome radio station (CARS) were not operating on published hours for February 15th 2017. CYGH 1 hour late opening. CYLK NOTAM'd closed from 1500Z to 0100Z. CYHI NOTAM'd closed from 1500Z to 0100Z. CYGT 1 hour late opening then NOTAM closed from 1400Z to 1700Z.

The following community aerodrome radio station (CARS) were not operating on published hours for February 5 2017. CYGH NOTAM closed 1400Z-1900Z. CYSY 1 hour late opening. CYKD NOTAM extended hours of operation 2100Z-0000Z. CYLK 1 hour late opening.

On January 25 2017 the following community aerodrome radio station (CARS) were not operating as per published hours. CYSY late opening. NOTAM closed 1400Z-1700Z.CYLK NOTAM closed 1500Z-0100Z.

On January 16 2017 the following community aerodrome radio station (CARS) were not operating on published hours. CYHK NOTAM closed 1300Z-0100Z. CYPC 2 hours late opening. CYLK NOTAM closed 1500Z-0100Z.

The following community aerodrome radio station (CARS) did not operate on published hours January 13 2017. CYGT opened late at 1216Z. Extended hours from 2200Z-0124Z. NOTAM published. CYSY closed. NOTAM published. CYHI closed at 0005Z NOTAM published. CYLK opened late at 1700Z. CYWY closed. NOTAM published. CZFN closed. NOTAM published. CYYH opened late at 0341Z. NOTAM published.

The following community aerodrome radio station (CARS) did not operate on published hours January 11 2017. CYGT CARS closed until 2100Z. NOTAM issued. CYHK CARS opened late at 1410Z. CYSY CARS opened late at 1600Z. CYLK CARS opened late at 1600Z. CYHI CARS closed 0000Z-0100Z. NOTAM issued. CZFN CARS closed until 0000Z. NOTAM issued

The following community aerodrome radio station (CARS) were not operating on published hours for calendar day Jan 6 2017. CYGT NOTAM closed 1100Z-2200Z. CYHK NOTAM closed 1300Z-2015Z. CYPC NOTAM closed 1400Z-1900Z. CYLK 1 hour late opening. CYHI NOTAM closed 2 hours early. CYYH NOTAM closed 070305Z-071530Z.