As colleague Bradley Perrett reported
, ATSB issued an interim factual report
confirming that a manufacturing defect in an oil feed pile was behind the Qantas A380 Rolls Royce Trent engine failure last November 4. Here are links to the report
and the accompanying ATSB release
The details, per the report:
Recent examination of components removed from the failed engine at the Rolls-Royce plc facility in Derby, United Kingdom, has identified the presence of fatigue cracking within a stub pipe that feeds oil into the High Pressure (HP) / Intermediate Pressure (IP) bearing structure. While the analysis of the engine failure is ongoing, it has been identified that the leakage of oil into the HP/IP bearing structure buffer space (and a subsequent oil fire within that area) was central to the engine failure and IP turbine disc liberation event.
Further examination of the cracked area has identified the axial misalignment of an area of counter‑boring within the inner diameter of the stub pipe; the misalignment having produced a localised thinning of the pipe wall on one side. The area of fatigue cracking was associated with the area of pipe wall thinning.
The report includes a detailed photo of the cracked pipe.