Created Monday, Mar 28th 2022 09:56Z, last updated Wednesday, May 8th 2024 12:47Z
A United Boeing 767-300, registration N675UA performing flight
UA-134 from Newark,NJ (USA) to Zurich (Switzerland) with 123 people on board, was enroute at FL370 over the Atlantic Ocean about 570nm west of Shannon (Ireland) when the crew reported the failure/damage of the right hand engine (PW4060), drifted down to FL250 and later FL200 and decided to divert to Shannon. The crew advised they would taxi off the runway and to the apron, no inspection on the runway or taxiway was necessary. The aircraft landed safely on runway 06 about 95 minutes after leaving FL370.
The Irish AAIU reported that a fan blade separated from the right hand engine, the aircraft also suffered damage to the right hand elevator with fragments of the fan blade being embedded in the elevator.
On May 8th 2024 the AAIU released their final factual report without conclusions but stating:
The Engine Manufacturer considered that the most likely sequence of events was:
1. No.1 Bearing distress caused by spalling in the outer, and likely spalling in the inner race (the exact cause of the spalling could not be determined).
2. No.1 oil supply tube fractured in high cycle fatigue, due to vibration in its first fundamental frequency range.
3. Inadequate lubrication to No. 1 bearing caused by No. 1 oil supply tube fracture.
4. No. 1 Bearing oil starvation and overheating, leading to raceway and ball wear.
5. Aft axial shift of low-pressure shaft causing rotor clashing.
6. Multiple engine surges.
7. Impact of released turbine blade on horizontal stabiliser.
8. Engine in-flight shutdown actioned by the Flight Crew.
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