|Quoting 474218 (Reply 3):|
As for 38 incidents of shorted windshield heater wiring and/or cracked windshields cased by shorted wiring or a 10 year period on a fleet of over 600 aircraft does not seem does not seem out of the ordinary at all.
The Transport Canada incident database must have at least 50 reports involving cracked windshields and related electrical issues in the last 12 months alone, and that's only Canadian-registered aircraft or aircraft in Canadian airspace. There are about 10 reports involving AC
A319/320/321s alone in the past 12 months. There must be many hundreds of such incidents worldwide.
Some examples from the Transport Canada reports::
ACA1281, Airbus 319 operated by Air Canada, was IFR from Montreal (CYUL) to Phoenix (KPHX). About 75 NM west of Montreal, the crew reported a cracked windshield and asked to return to Montreal/. No emergency was declared or priority requested.
Airbus A319 registered C-FYKC operated by Air Canada and flown as flight number ACA0974 took off from Montreal (CYUL) en route to Bridgetown, Barbados (TBPO). In cruise flight at FL370 at about 150 NM NW of Bermuda the captain's windscreen cracked. As a precaution, per QRH, the flight descended to FL230. An emergency was declared with New York Oceanic and diversion was requested to Bermuda (TXKF). ARFF met aircraft at landing which was uneventful. Windscreen replaced as per MM 56-11-11.
Air Canada Jazz (C-FGRM) DHC 8 102, was inbound to Cranbrook (CYXC) from Vancouver (CYVR) when the right hand windshield erupted in flames arcing and smoke in the terminal block connector area. The windshield heat was shut off and the event ceased. No fire extinguisher was required and none of the windshield plies shattered. Passenger announcements were made due to the smoke. No emergency was declared and the flight continued to Cranbrook where an uneventful landing was carried out. The total time since new for the windshield was 7563 hours.
AWE722, US Airways Boeing 757-200, enroute from Philadelphia (KPHL) to Dublin (EIDW), requested clearance to return to Philadelphia due to a windshield heating issue. No emergency was declared.
AAL65, American Airlines Boeing 767-300 enroute from Zurich (LSZH) to New York (KJFK) requested an emergency descent due to a cracked windshield. Air Traffic Control (ATC) cleared AAL65 to 24000 ft. The flight crew later advised that operations were normal, requested a climb to 30000 ft and proceeding to the destination. The aircraft was cleared as requested.
Air Canada Jazz DHC8-102 (C-GONY) departed Calgary (CYYC) for Kamloops (CYKA) and was in cruise at FL240 about 75 NM northeast of Kelowna when the crew observed a flash of light and heard a loud bang coming from the First Officer's front windshield which subsequently shattered. The crew declared an emergency and elected to divert to Kelowna (CYLW) where the aircraft landed without further event, with Aircraft Rescue and Fire Fighting in attendance. Company maintenance arranged to complete the replacement of the windscreen in Kelowna.
Aruba-registered privately-operated Airbus A319 (P4-MIS), was on an IFR flight from Moscow Vnukovo (UUWW) to White Plains/Westchester (KHPN). At 0006Z, the crew reported a crack in the windshield and requested to descend from FL360 to FL240. No emergency was declared or priority requested. The flight continued to its destination.
JZA3023, Air Canada Jazz Boeing 757-200 (registration C-GJZT), enroute from Punta Cana, Dominican Republic (MPDC) to Toronto (CYYZ) was in cruise flight at FL360 over the Atlantic Ocean approximately 300NM northeast of the Bahamas when it experienced arcing in the First Officer's windscreen. The windscreen heat was turned off. About two minutes later, there was a bang and the windshield shattered. The flight crew declared an emergency, descended the aircraft to 10,000 feet, and diverted to Nassau, landing without further incident about one hour later. Maintenance staff replaced the right-hand forward windscreen and the window heat controller and the airplane was returned to service.
Air Canada Boeing 767-300, C-FXCA, operating as ACA64, took off from Incheon, South Korea for Vancouver. About an hour after reaching cruising altitude the flight crew noticed a smell of electrical fumes within the cockpit. They switched off the gasper and recirculation fans and the smell subsided. About four hours later, the smell re-appeared with minor wisps of smoke emanating from underneath the captain's glareshield. As the source appeared to be the forward window (L1) heat connector, the window heat was selected off and the smoke quickly subsided. The aircraft landed at Vancouver without further event. Maintenance replaced the captain's L1 windscreen and window heat connector, and after testing the aircraft was returned to service.
Air Canada Airbus A320 (operating as ACA1142) was on a scheduled IFR flight from Calgary (CYYC) to Montréal (CYUL). The flight crew reported a cracked windshield to Toronto ACC and requested permission to descend. Toronto ACC staff descended the aircraft and transferred the flight to Montréal ACC. The aircraft landed at its destination without incident.
Air Canada Airbus A319 (operating as flight ACA756) was on a scheduled IFR flight from San Francisco (KSFO) to Toronto (CYYZ). The aircraft was en-route, flying over Nebraska, when the flight crew declared an emergency due to a cracked windshield. The flight diverted to Minneapolis (KMSP) and landed without incident at 0018Z.
Air Canada Airbus A320 (operating as flight ACA591) was on a scheduled IFR flight from Toronto (CYYZ) to Las Vegas (KLAS). The flight crew declared an emergency due to a crack in the left side windshield and diverted to Minneapolis (KMSP) where the aircraft landed without incident.
United States Air Force Boeing KC-135R aerial tanker aircraft, operating as TOPCAT4, was on an IFR flight from McGuire Air Force Base, NJ (KWRI) to Alpena, MI (KAPN) when the aircraft experienced a cracked windshield 35 miles northwest of the London VOR (YXU). The flight crew requested descent from 24,000 feet to 10,000 feet for precautionary purposes.
A Portuguese registered Gulfstream G-V operated by NetJets Europe, departed Calgary for Houston, but subsequently returned to Calgary due to a cracked windshield.
Air Canada Jazz Bombardier CL-600-2D15 (CRJ-705) (operating as flight JZA8923) was on a scheduled IFR flight from Québec City (CYQB) to Toronto (CYYZ). The aircraft was approximately 15NM east of Simcoe when the flight crew reported a cracked windshield at 2345Z. The aircraft landed without incident at 0005Z.
Air Canada Airbus A320 (operating as ACA 169) was en route from Toronto to Vancouver and when approximately 65 NM east of Sioux Narrows, the first officer's outer window panel started to arc. While the crew was carrying out the related QRH items the window panel cracked. The crew declared an emergency and requested to divert to Winnipeg, where they carried out an overweight landing. ARFF vehicles were standing by. Company maintenance performed an overweight landing check and replaced the damaged window panel.
Air Canada Flight ACA159, Airbus A321, registration C-GIUF was en route from Toronto to Edmonton. While in cruise, the crew received an "ANTI ICE R WINDSHIELD" indication. Shortly after that the right windshield cracked. The crew elected to divert to Winnipeg where the aircraft landed without further incident. The #2 window heat computer and right windshield was replaced and the aircraft was returned to service.
JZA 389, Air Canada Jazz DHC-8-311, was en route from Fort McMurray (CYMM) to Edmonton (CYEG) when the crew reported a cracked windshield and requested a slow descent. No emergency was declared and no services were requested. JZA 389 landed safely at 0218z.
MPE438, Boeing 737-200C, registration C-GNDU operated by Canadian North, departed Rankin Inlet (CYRT) for Iqaluit (CYFB). At 150 miles west of Iqaluit at FL310, the crew heard a loud bang and observed the First Officer's side windshield had severely cracked. The crack ran through the center and several other cracks radiated from it. An emergency descent to 11,000 ft.was started immediately and code 7700 was selected. The aircraft flew to CYFB and landed without further problems.
Air Canada Airbus A320 (C-FZUB) was operating as ACA1160 on a flight from Edmonton to Toronto. After takeoff, the crew received an R WINDOW ECAM (window heat system) message. While climbing through FL00 the right hand number 3 windshield cracked. ACA1160 diverted to Calgary for maintenance where the aircraft landed overweight. Maintenance replaced the window and window heat computer. The maximum vertical acceleration on landing was recorded as 1.5G, therefore no further inspection regarding an overweight landing was required.
Air Canada Airbus A320, C-GJVT, had departed Halifax for Toronto when, just after departure, the flight crew advised that the aircraft had a cracked windshield. They requested and received a clearance to return to Halifax and landed safely without further incident with ARFF standing by. Maintenance personnel replaced the windshield and heat controller.
TSC722, Air Transat Airbus A310-304, enroute from Toronto (CYYZ) to London Gatwick (EGKK), routing between 50N 040W and 51N 030W at FL340, at approximately 32W, declared PAN PAN PAN due to a cracked windscreen and requested clearance to a lower altitude. TSC722 descended to 25,000 ft. and diverted to St. John's (CYYT), landing safely at 08:01Z without further incident.
VIR3J, Virgin Atlantic Airways Airbus A340-600, enroute from London (EGLL) to New York (KJFK) at 40,000 ft., reported a cracked windshield and requested clearance to descend. The aircraft was cleared to 22,000 ft. No assistance was required.
At 16:30Z, RCH7045, United States Air Force C-17, enroute from Goose Bay (CYYR) to Travis Air Force Base, CA (KSUU), advised of a windshield crack and requested a destination change for maintenance. The flight was cleared as requested. No emergency was declared.