The NTSB has published a second update in its investigation of the engine fire which caused the dramatic evacuation of a British Airways 777 on the tarmac at Las Vegas. You can see video of it here:
Their update is:
• Investigators disassembled and documented the GE90 engine at the GE facility in Evandale, Ohio. Group members from the FAA, GE, and Boeing, along with the United Kingdom’s accredited representative from the Air Accidents Investigation Branch and their technical advisor, British Airways, were in attendance.
• Engine examination revealed that a portion of the stage 8-10 spool in the high-pressure compressor (HPC) section had failed, liberating fragments that breached the engine case and cowling. Additional pieces of the HPC spool were recovered from inside the engine and retained for metallurgical examination.
• The NTSB Materials Laboratory examined engine parts gathered from the scene.
• HPC parts recovered during the disassembly of the engine were examined at the GE facility.
• All pieces of the damaged stage 8 disk rim have been collected.
• The fracture initiated in the HPC stage 8 disk web, a part of the stage 8-10 spool. The NTSB will continue metallurgical evaluations of the disk and the fracture features.
• GE is performing high-priority, focused inspections of HPC hardware from other GE90 engines. The inspection data is being gathered to support the investigation and to determine further investigative actions.
It appears that the original view that a failure in the high-pressure compressor caused fragments to breach the engine. GE, who make the engine are reviewing other GE90 engines.