A United Airlines Boeing 777-222 (N217UA/UAL951) from Brussels, Belgium (EBBR) to Washington-Dulles, VA (KIAD) declared a medical emergency due to an ill passenger on board and changed its destination from KIAD to Boston/Logan, MA (KBOS). Information was transmitted to the Boston air traffic services (ATS) unit. No impact on operations.

At takeoff from Runway 24L, a Commutair/United Express Embraer EMB-145XR (UCA4959) from Montreal/Trudeau, QC (CYUL) to Washington-Dulles, VA (KIAD) turned left at 2 000 ft to get out of the wake turbulence of an Air China Ltd. Boeing 787-9 (B7832/CCA880) from Montreal/Trudeau, QC (CYUL) to Beijing, China (ZBAA). No impact on operations and no separation problem.

An EgyptAir Airbus BD-500-1A11 A220-300 (MSR3330) from Montreal/Mirabel, QC (CYMX) to Ostend, Belgium (EBOS) departed assigned altitude without air traffic control (ATC) clearance. Aircraft reported system failure. No loss of separation with a United Airlines Boeing 777-200 (UAL107) from Munich, Germany (EDMM) to Washington/Dulles, VA (KIAD) or impact to operations.

An Ethiopian Airlines Boeing 777-300 (ETH500) from Dublin, Ireland (EIDW) to Washington/Dulles Intl, VA (KIAD) received and read back clearance to go directly to (ALB) Albany, but turned too far to the left off the path. Approximately 10 minutes later, ETH500 was questioned on its route and corrected the heading to go directly to Albany. No impact on operations.

A Sky Regional Airlines Inc. Embraer ERJ 170-200 SU (SKV7711) from Washington/Dulles, VA (KIAD) to Toronto/Lester. B Pearson, ON (CYYZ) experienced a wake encounter behind an Air Canada Embraer ERJ 190-100 IGW (ACA969) from Great Exuma, Bahamas (MYEF) to Toronto/Lester. B Pearson, ON (CYYZ). No operational impact.

Wake encounter experienced by a Mesa Airlines Bombardier CL-600-2C10 (ASH6196) from Washington-Dulles, VA (KIAD) to Toronto/Lester B. Pearson, ON (CYYZ). The other aircraft was a WestJet Boeing 737-800 (WJA2625) from Holguin/Frank Pais, Cuba (MUHG) to Toronto/Lester B. Pearson, ON (CYYZ). No operational impact.

A Sky Regional Airlines Embraer ERJ 170-200 SU (SKV771) from Washington-Dulles, VA (KIAD) to Toronto/Lester B. Pearson, ON (CYYZ) reported wake turbulence behind a Turkish Airlines Inc. Boeing 777-300 (THY17W) from Istanbul, Turkey (LTFM) to Toronto/Lester B. Pearson, ON (CYYZ) on base for Runway 06L at CYYZ. SKV771 landed safely. No further impact.

South ground issued taxi instructions to a Commutair/United Express Embraer EMB-145XR (UCA4949) from Toronto/Lester B. Pearson, ON (CYYZ) to Washington-Dulles, VA (KIAD) while the aircraft was still on a deice pad and control transfer had not yet been affected.

Aviation Incident Report #16525: A Commutair/United Express Embraer EMB-145XR (N12195/UCA4949) from Toronto/Lester B. Pearson, ON (CYYZ) to Washington Dulles, VA (KIAD) was deiced at the Central Deicing Facility (CDF) on Pad 3N. After deicing was complete, Iceman provided the post deice information, and advised the Flight Crew to contact Pad Control for taxi (exit) instructions. Pad Control observed the aircraft start to taxi with a taxi clearance and electronic message boards displaying "HOLD 131.175" with two RED lights. Pad Control was unable to contact the flight on the very high frequency (VHF) airway, and then contacted South Ground via hotline to see if they were speaking to the flight. South Ground was in contact with the flight and was asked to stop the aircraft and have the flight crew switch back to Pad Control frequency. Flight crew contacted South Ground and requested taxi instructions, rather than Pad Control as they were instructed to.

A Champlain Enterprises Embraer EMB-145XR (N11194/UCA4876) from Washington-Dulles, VA (KIAD) to Ottawa/Macdonald-Cartier, ON (CYOW) executed a missed approach on Runway 32, due to an unstable approach. No impact on operations.

After receiving approach clearance and being switched to the tower, a Mesa Airlines Bombardier CL-600-2C10 (ASH6042) from Washington-Dulles, VA (KIAD) to Ottawa/MacDonald-Cartier, ON (CYOW) never called the Tower nor responded to numerous calls. ASH6042 landed Runway 25, exited on Echo and taxied to its gate without talking to the Tower or Ground at all. No impact.

A United Airlines Inc. Boeing 777-200 (UAL950) from Washington-Dulles, VA (KIAD) to Brussels, Belgium (EBBR) requested to turn around and return to KIAD due to a mechanical issue. No assistance required. No impact on operations or emergency declared.

At time 2202Z and just west of 50N050W, a British Airways Boeing 787-9 (GZBKD/BAW293) on a flight from Heathrow/London Intl, UK (EGLL) to Washington/Dulles, VA (KIAD) declared a PAN PAN due to a pressurization issue and requested descent from FL410 to FL350. The flight was recleared to FL340. BAW293 reported the situation good at FL340 and PAN PAN cancelled at 2215Z. Flight continued to its destination and exited the Gander Intl, NL (CYQX) flight information region (FIR) at 2248Z.

Severe turbulence reported by several aircraft including an Air France Boeing 777-300 (AFR054) on a flight from Paris/Charles de Gaulle, France (LFPG) to Washington/Dulles Intl, VA (KIAD).

Severe turbulence reported by several aircraft including a Qatar Airways Boeing 777-300 (QTR707) on a flight from Doha, Qatar (OTHH) to Washington/Dulles Intl, VA (KIAD).

En route, a United Airlines Boeing 787-9 (UAL807) from Washington/Dulles, VA (KIAD) to Beijing, China (ZBAA) reported a medical emergency on board (involving a passager) and asked to be vectored to KIAD. Coordination carried out. No impact.

An Embraer EMB-125XR (N12160/UCA4956) from Montreal/Pierre Elliott Trudeau Intl, QC (CYUL) to Washington-Dulles Intl, DC (KIAD) rejected its takeoff due to an oil pressure problem indication.

A Jazz Bombardier CL-600-2B19 (C-GJZZ/JZA8172) on a flight from Montreal/Pierre Elliott Trudeau Intl, QC (CYUL) to Washington-Dulles Intl, DC (KIAD) rejected two takeoffs due to an indication in the cockpit. The aircraft returned to the gate.

Although it had received and read back clearance to climb to FL230, a Jazz Bombardier CL-600-2B19 (C-GUJA/JZA8172) from Montreal/Pierre Elliott Trudeau Intl, QC (CYUL) to Washington/Dulles Intl, DC (KIAD) called Boston, MA (KBOS) on climb to FL280. No impact.

A United Airlines Boeing 757-200 (UAL127) on a flight from Dublin, Ireland (EIDW) to Washington-Dulles Intl, VA (KIAD) request diversion to Bangor, ME (KBGR) due to a mechanical issue. No emergency or impact on operations.

An Aviation Starlink Learjet 45 (C-GMSY) from Montreal/Trudeau, QC (CYUL) to Montreal/Mirabel, QC (CYMX) lined up and was instructed to prepare itself immediately for takeoff on Runway 24L. C-GMSY taxied slowly. Impact: a Mesa Airlines Bombardier CL-600-2C10 (series 700) (N516LR/ASH6170) from Washington-Dulles, VA (KIAD) to Montreal/Trudeau, QC (CYUL) had to conduct a go-around.

While inbound for Runway 24R, an Endeavor Air Bombardier CL-600-2D24 (EDV5503) from Minneapolis/St. Paul, MN (KMSP) to Montreal/Pierre Elliott Trudeau, QC (CYUL) did not turn at AGNAG towards TIDAS and maintained its heading. Impact: the separation between a Mesa Airlines Bombardier CL-600-2C10 (N513MJ/ASH6138) from Washington/Dulles, DC (KIAD) and EDV5503 was reduced to 2.6 NM and 400 ft, where 3 NM and 1 000 ft are required. No other impact on operations.
UPDATE TSB #A19Q0136: N902XS, an Endeavor Air Canadair CRJ900 (CL-600-2D24) (EDV5503) was flying IFR from Minneapolis—St. Paul/Wold-Chamberlain, MN, to Montreal/Pierre Elliott Trudeau International (CYUL), QC. During its approach to CYUL, the aircraft did not turn towards TIDAS after AGNAG, as prescribed, and instead continued on its course. Separation with N513MJ, a Mesa Airlines Canadair CRJ700 (CL-600-2C10) (ASH6138) flying from Washington-Dulles Intl (KIAD), Washington, DC, to CYUL was reduced to 2.6 NM horizontally and 400 feet vertically, whereas the required separation was 3 NM horizontally or 1,000 feet vertically.

On approach into Montreal/Pierre Elliott Trudeau, QC (CYUL), a Mesa Airlines Bombardier CL-600-2C10 (series 700) (ASH6170) from Washington Dulles (KIAD) to Montreal/Pierre Elliott Trudeau, QC (CYUL) asked that police meet the aircraft due to an unruly passenger on board. Landed at 1842Z. No impact on operations.

A Mesa Airlines Bombardier CL-600-2C10 (Series 700) (N515MJ/ASH6294) from Montreal/Trudeau, QC (CYUL) to Washington-Dulles, VA (KIAD) rejected its takeoff. It took off at 0022Z. No impact.

A Jazz Bombardier CL-600-2B19 (series 200) (JZA8173) from Washington-Dulles, VA (KIAD) to Montreal/Trudeau, QC (CYUL) at 4 000 ft reported that there was a drone in sight at 4 300 ft, downwind. No impact on operations.

A Mesa Airlines Bombardier CL-600-2C10 (series 700) (ASH6259) from Washington-Dulles, VA (KIAD) to Montreal/Trudeau, QC (CYUL) was seen flying at a speed that was incompatible with traffic on approach for Runway 24R and that did not match the instruction given out by air traffic services (ATS) and read back by the aircraft. ATS instructed ASH6259 to conduct a go-around to avoid reducing separation to an inadequate level. No impact on operations.

A Bombardier CL-600-2C10 (series 700) (N508MJ/AH6259) from Washington-Dulles, VA (KIAD) to Montreal/Pierre Elliott Trudeau, QC (CYUL) decided to conduct a go-around due to a possible gear problem. The aircraft landed without incident on Runway 24R at 2343Z. No impact on operations.

A Boeing 777-300ER (N2136U/UAL58) from San Francisco, CA (KSFO) to Washington-Dulles, VA (KIAD) requested to divert due to an ill passenger, but the aircraft did not declare an emergency. No impact on operations.

A Jazz Bombardier CL-600 2B19 (Series 200) (JZA8172) from Montreal/Pierre Elliott Trudeau Intl, QC (CYUL) to Washington-Dulles Intl, VA (KIAD) returned to CYUL due to a pressurisation problem. No impact on operations.

A Mesa Airlines Bombardier CL-600-2C10 (series 700) (N508MJ/ASH6259) from Washington-Dulles, VA (KIAD) to Montreal/Trudeau, QC (CYUL) rejected its approach for Runway 24R, then declared an emergency due to a gear problem. ASH6259 landed without incident at 2343Z and taxied to the gate.
UPDATE: CADORS 2019Q0289 (AOR 244435-V1) was a duplicate of this occurrence and was deleted.
Update: TSB Report #A19Q0017: N508MJ, a Mesa Airlines Bombardier CL-600-2C10 CRJ700, was on instrument flight rules (IFR) flight ASH6259 from Washington-Dulles, VA (KIAD) to Montreal/Trudeau, QC (CYUL). During the approach for Runway 24R at CYUL, there was an anomaly with the landing gear. The flight crew conducted a pull-up and declared an emergency. The aircraft returned, landed without incident, and taxied to the gate.

An RCMP Air Services Branch Pilatus PC-12/47E (C-GMPO) from Montreal/St-Hubert, QC (CYHU) to Washington-Dulles International, VA (KIAD) climbed to 6000 feet when the aircraft was only cleared up to 5000 feet.

A Porter Airlines de Havilland DHC-8-402 (POE244) from Ottawa/Macdonald-Cartier, ON (CYOW) to Toronto/Billy Bishop, ON (CYTZ) had a nose wheel steering issue after landing and was slow to exit runway. A Porter Airlines de Havilland DHC-8-402 (POE726) from Washington/Dulles, VA (KIAD) to Toronto/Billy Bishop, ON (CYTZ) was instructed to go around and returned for landing without issue.

The crew of a Republic Airways Embraer ERJ 170-200LR (RPA3557) on a flight from Washington/Dulles Intl, VA (KIAD) to Toronto/Lester B. Pearson Intl, ON (CYYZ) initiated a go around Runway 06L due to an unstable approach. RPA3557 landed at 1434Z. No operational impact.

Between 2241Z and 2300Z there were 8 missed approaches due to wind shear including a Sky Regional Airlines Embraer ERJ 170-200 SU (C-FRQP/SKV7711) on a flight from Washington/Dulles Intl, DC (KIAD) to Toronto/Lester B. Pearson Intl, ON (CYYZ).

A Sky Regional Airlines Inc. Embraer ERJ 170-200 SU (C-FRQP/SKV7711) from Washington/Dulles, DC (KIAD) to Toronto/Lester. B Pearson, ON (CYYZ) advised they were carrying out a missed approach Runway 24L due to wind shear. Aircraft issued with a heading of 235 degrees and climb to 3000ft. Aircraft observed to take up a heading of approx 270 degrees. Pilot was subsequently instructed to fly heading 180 degrees. Aircraft observed to take up the heading but then started descending. When pilot was queried they advised they were dealing with some weather issues. SKV7711 then diverted to Cleveland, OH (KCLE).

A Mesa Airlines Bombardier CL-600-2C10 (N501MJ/ASH6197) on a flight from Toronto/Lester B. Pearson Intl, ON (CYYZ) to Washington/Dulles Intl, DC (KIAD) was observed to deviate from cleared route (RIGUS 2 DEP) after position DUSOM. The aircraft was tracking direct to PSB instead of via the transition i.e. DUSOM-RIGUS-MIKKY-PSB.

A Mesa Airlines Bombardier CL-600-2C10 (ASH6197) on a flight from Toronto/Lester B. Pearson Intl, ON (CYYZ) to Washington/Dulles Intl, DC (KIAD) on the RIGUS2 departure turned direct to PSB.

A Porter Airlines Inc. de Havilland DHC-8-402 (C-GKQI/POE727) from Toronto/Billy Bishop, ON (CYTZ) to Washington-Dulles, VA (KIAD) reported a traffic alert and collision avoidance system (TCAS) resolution advisory (RA) from a Helicopter Company Inc. Robinson R44 II (C-GSTL) from Toronto/Billy Bishop, ON (CYTZ) to Toronto/Billy Bishop, ON (CYTZ) that had departed the apron earlier. No impact to operations.

A Sky Regional Airlines Embraer ERJ 170-200 SU (SKV7711) on a flight from Washington-Dulles Intl, VA (KIAD) to Toronto/Lester B. Pearson Intl, ON (CYYZ) reported a possible bird strike on landing Runway 24R. Nothing found during inspection. No impact to operations.

A Porter Airlines DHC-8-402 (C-GLQB/POE729) from Toronto/Billy Bishop, ON (CYTZ) to Washington/Dulles Intl, DC (KIAD) reported a green laser strike climbing through 3000 feet after departing Runway 08.

On departure, a Mesa Airlines Bombardier CL-600-2C10 (Series 700) (ASH6197) from Toronto/Lester B. Pearson, ON (CYYZ) to Washington-Dulles, VA (KIAD) was unable to retract the nose gear. ASH6197 declared an emergency and requested a return to CYYZ with emergency equipment on standby. ASH6197 accomplished their checklist and landed on Runway 15L uneventfully. Emergency vehicles met and escorted the flight to the gate. No operational impact.
Update TSB #A19O0108: N510MJ, the Mesa Airlines CL-600-2C10 (ASH6197) was on initial climb out from Lester B. Pearson Intl - Toronto (CYYZ) when the flight crew received a GEAR DISAGREE EICAS message and was unable to retract landing gear. The flight crew declared an emergency and returned to CYYZ and landed uneventfully with ARFF standing by. The operators maintenance placed the landing gear on MEL, pinned it in the down position, and the aircraft flew back to their maintenance facility in Washington Dulles Intl (KIAD) with landing gear extended.

An Air Georgian Limited Bombardier CL-600-2B19 (Series 100) (C-GZJA/GGN7370) from Toronto/Lester B. Pearson, ON (CYYZ) to Washington-Dulles, WA (KIAD) reported a possible bird strike after departing Runway 33R. An inspection vehicle was deployed and did not find any bird. No impact to operations.

A Mesa Airlines Bombardier CL-600-2C10 (N509MJ/ASH6271) on a flight from Washington/Dulles, VA (KIAD) to Toronto/Lester B. Pearson Intl, ON (CYYZ) was instructed to initiate a missed approach to CYYZ Runway 05 due to previous landing aircraft, an American corporately registered Piper PA-46-500TP (N929DA) on a flight from Caldwell, NJ (KCDW) to Toronto/Lester B. Pearson Intl, ON (CYYZ) still exiting the runway.

After landing, a Porter Airlines de Havilland DHC-8-400 (POE718) from Washington/Dulles (KIAD) to Toronto/Billy Bishop (CYTZ) reported getting a TCAS RA from an American, privately registered, Cessna 208B (N101CG) while they were descending for the airport. No action was taken and no impact to operations.

A Porter Airlines Inc. de Havilland DHC-8-402 (C-GLQL/POE727), from Toronto/Billy Bishop, ON (CYTZ) to Washington-Dulles, VA (KIAD), was passed helicopter traffic restricted north of the field and told to remain on tower frequency when being cleared for takeoff. When being switched to the terminal, POE727 said they had received a traffic alert and collision avoidance system (TCAS) climb.

An Air Georgian Limited Bombardier CL-600-2B19 (Series 100) (GGN7371) from Washington-Dulles, VA (KIAD) to Toronto/Pearson, ON (CYYZ) was cleared to taxi on a closed taxiway.

An Air Georgian Limited Bombardier CL-600-2B19 (Series 100) (GGN7370) from Toronto/Pearson, ON (CYYZ) to Washington-Dulles, VA (KIAD) aborted takeoff. As a result, a Delta Air Lines Inc. McDonnell Douglas MD 88 (DAL2259) from Atlanta, GA (KATL) to Toronto/Pearson, ON (CYYZ) was instructed to overshoot when GGN7307 could not vacate the runway in time.

A Mesa Airlines Inc. Bombardier CL-600-2C10 (Series 700) (N503MJ/ASH6142) from Washington-Dulles Int., VA (KIAD) to Ottawa/Macdonald-Cartier Int., ON (CYOW) declared a medical emergency due to an ill passenger on board. ASH6142 landed at 1438Z and requested an ambulance at the gate. No impact on operations.

An Air Georgian Limited Canadair CL-600-2B19 (Series 100) (C-FWRS/GGN7373) from Washington-Dulles Intl, VA (KIAD) to Toronto/Pearson Intl, ON (CYYZ), after hand-off from the Cleveland Air Route Traffic Control Centre (ZOB), did not make contact with the Toronto Centre (CZY) (Grimsby sector) until 25NM inside the airspace. The pilot reported they did not hear any change over instruction. ZOB reported they were unable to contact the aircraft for a frequency change instruction.

While enroute, the pilot of a United Airlines Inc. Boeing 767-300 (UAL959) from London/Heathrow, UK (EGLL) to Washington-Dulles Intl, VA (KIAD) reported mechanical issues and asked to be rerouted to Chicago/OHare Intl, IL (KORD). No emergency was declared. Coordination was carried out. No impact.