ASN Wikibase Occurrence # 145871
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Narrative:The Air Canada Boeing 777-333ER aircraft (registration C-FITW), operated as flight AC-001, commenced the take-off from runway 23 at Toronto-Lester B. Pearson International Airport, Ontario. The aircraft, with 16 crew members and 309 passengers on board, was en route to Narita International Airport in Tokyo, Japan. During the initial climb-out, at approximately 1590 feet above ground level, the number 2 engine failed (GE 90-115B, serial number 906-456). The flight crew followed the Quick Reference Handbook procedures and secured the engine. Air traffic control was notified of the event, and the flight crew declared an emergency. After jettisoning fuel to reduce the aircraft weight down to the maximum landing weight, an uneventful landing was carried out at Toronto-Lester B. Pearson International Airport. Emergency services stood by for the landing and escorted the aircraft back to the gate. There were no injuries, but the underside of the right wing received minor damage from engine debris ejected through the exhaust. Several automobiles on the ground were also damaged from the falling debris. There were no reported injuries.
|Fatalities:||Fatalities: 0 / Occupants: 325|
|Aircraft damage:|| Minor|
|Location:||Toronto–Lester B. Pearson International Airport, Ontario (YYZ) -
|Phase:|| Initial climb|
|Nature:||Passenger - Scheduled|
|Departure airport:||Toronto-Pearson International Airport, ON (YYZ/CYYZ)|
|Destination airport:||Tokyo-Narita Airport (NRT/RJAA)|
|Confidence Rating:|| Information verified through data from accident investigation authorities|
Findings as to causes and contributing factors:
During shroud production, a change to a higher-intensity laser resulted in a variation in the shape and size of the shroud cooling holes. Over a period of time in service, these cooling holes eroded, which resulted in both degraded shroud cooling and a super-heated zone. This, in turn, increased the rate of erosion until the shroud integrity was reduced to the point of failure.
Damage to high-pressure turbine shrouds and hangers, which was likely present during the last borescope inspection, went undetected prior to the occurrence. As a result, the engine was not removed from service.
The number 2 engine shut down during the initial climb-out due to a failure of the high-pressure turbine stage 1 shroud.
Other occurrences involving this aircraft
|11 Dec 2018
|| Hong Kong-Chek Lap Kok International Airport (HKG)
||Updated [Aircraft type, Location, Phase, Departure airport, Destination airport, Source, Narrative]|
||Updated [Aircraft type, Registration, Cn, Total occupants, Source, Damage, Narrative]|
||Updated [[Aircraft type, Registration, Cn, Total occupants, Source, Damage, Narrative]]|
||Updated [Time, Total occupants, Source, Narrative]|
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