Taken from The Age: http://www.theage.com.au/travel/travel-news/new-problem-hits-qantas-a380-engine-20110218-1az5z.html Air-safety inspectors are investigating oil problems with an engine on a Qantas A380 superjumbo after pilots decided to reduce its thrust to idle about two hours out of London. The pilots of the A380 noticed a gradual decrease in the amount of oil the number-four engine was using while flying over India's capital, New Delhi, on Tuesday during a service from Singapore. The crew decided as a precaution to reduce the engine's thrust to idle about two hours' flying time away from Heathrow airport. The Australian Transport Safety Bureau said an engineering inspection later found that an external oil line on the engine had not been correctly refitted after it had been removed for testing. The Rolls-Royce Trent 900 engine was one of many inspected in the weeks after a Qantas A380 suffered a midair engine explosion shortly after take-off from Singapore late last year. Qantas said today that the latest problem "is not related in any way" to the QF32 incident on November 4, which forced the airline to ground its superjumbo fleet for weeks. It stressed that the engine was placed on idle thrust and was not shut down at any stage during the flight. The A380 involved in the latest incident – the third that Qantas took delivery of – remains in service. The ATSB is continuing its investigation. Qantas has estimated that the grounding of its A380 fleet late last year cost it $80 million. That figure does not include a $100 million repair bill for the Nancy Bird Walton, the A380 that sustained the midair engine explosion. That superjumbo – the only one still grounded – is likely to return to the air by the end of the year. Qantas expects that repair bill to be covered by insurance and "contractual arrangements" with Rolls-Royce. The airline remains locked in negotiations over damages with Rolls-Royce, but has reserved the right to pursue the engine maker through the courts in Australia if talks break down.