DERG
Thought you may find this interesting:
Rolls-Royce on Thursday quantified the initial cost of dealing with an engine failure that caused a Qantas flight to make an emergency landing last year.
The group announced a £56m dent in full-year profits as the cost of rectifying all the problems on the faulty engine.
Sir John Rose spoke publicly for the first time about the problems with its Trent 900 engine used on the Airbus A380, parts of which exploded last November on a Qantas flight from Singapore to Sydney.
The company said that such “uncontained” engine failures occur roughly once a year in the global civil aviation sector. Rolls-Royce last suffered such an engine fault in 1994.
Now, either news travels slowly to the top of the organization, or there are multiple definitions to the words "uncontained failures".
AO-2010-066
On 30 August 2010 at approximately 2330 Pacific Daylight Time, a Boeing 747-438 aircraft, registered VH-OJP, departed San Francisco International Airport on a scheduled passenger service to Sydney, Australia. As the aircraft passed through 25,000 ft, the aircraft's number-4 engine sustained an internal mechanical failure, resulting in the energetic release of debris and puncturing of the engine casing and nacelle. The engine was shut down and the flight crew returned the aircraft to San Francisco, where it landed without further incident.
The investigation is continuing.
FAA Airworthiness Directive
During 2004, an incident was reported involving uncontained multiple intermediate-pressure (IP) turbine blade release on a Trent 700 engine. The blade release was the result of an overspeed of the IP turbine rotor that was initiated by an internal fire in the high-pressure/intermediate-pressure (HP/IP) bearing chamber. Post-incident analysis and investigation has established that blockage of the HP/IP turbine bearing oil vent tube due to carbon deposits was a significant factor in the failure sequence. The Trent 800 has a similar type design standard to that of the Trent 700 and has also been found in service to be susceptible to carbon deposits in the oil vent tube.