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ASN Wikibase Occurrence # 145871
Last updated: 2 April 2020
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Date:28-MAY-2012
Time:14:25
Type:Silhouette image of generic B77W model; specific model in this crash may look slightly different
Boeing 777-333ER
Owner/operator:Air Canada
Registration: C-FITW
C/n / msn: 35298/638
Fatalities:Fatalities: 0 / Occupants: 325
Other fatalities:0
Aircraft damage: Minor
Location:Toronto-Pearson International Airport, ON (YYZ/CYYZ) -   Canada
Phase: Initial climb
Nature:International Scheduled Passenger
Departure airport:Toronto-Pearson International Airport, ON (YYZ/CYYZ)
Destination airport:Tokyo-Narita Airport (NRT/RJAA)
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.

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.

Sources:

http://tsb.gc.ca/eng/rapports-reports/aviation/2012/a12o0074/a12o0074.asp


Images:

Photo of C-FITW courtesy AirHistory.net


London - Heathrow (EGLL / LHR)
14 September 2019; (c) Stephen Rendle

Revision history:

Date/timeContributorUpdates
28-May-2012 22:06 thaimax Added
28-May-2012 22:11 harro Updated [Aircraft type, Location, Phase, Departure airport, Destination airport, Source, Narrative]
28-May-2012 22:18 RobertMB Updated [Aircraft type, Registration, Cn, Total occupants, Source, Damage, Narrative]
28-May-2012 22:18 RobertMB Updated [[Aircraft type, Registration, Cn, Total occupants, Source, Damage, Narrative]]
13-Dec-2013 20:09 harro Updated [Time, Total occupants, Source, Narrative]

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