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Accounts numbers for nearly half of the Trent 900 engines powerup command operated by Qantas, Singapore Airlines and Lufthansa German, and follows an extensive checks after November 4 for the Indonesia explosion.

"Rollers may have to look at alternative up to 40 engines throughout the A380 fleet" Qantas spokesperson told AFP.

"Which includes the fleet and Singapore Lufthansa.De fleet obviously Qantas has 40 engines to replace, we have six aircraft with four engines each,", she added.

Qantas Chief Alan Joyce said that up to 14 A380 company engines could potentially need to be replaced, leaving unclear when its fleet command will resume the flying their routes in Los Angeles and London.

Rolls-Royce was already change engines to prevent oil leaks, but none of the turbines of Qantas has been updated, said Mr. Joyce.

National carrier the Australia anchored all six of his command after the explosion, which requires an emergency landing Singapour.Qantas said earlier that it will take at least three new engines after security checks found oil leaks.

Singapore Airlines was founded on three of its 11 A380 and Lufthansa develops an engine on one of its three superjumbos precaution, while other A380 operators use turbines made by different manufacturers.

"Rolls-Royce employ around the criteria for which engines must be changed," Joyce said to journalists.

"We hope to understand precisely the engines must be replaced and closes so that we can have a timetable for when they will be back in the air, but we are still a few days far as", he added.

Rolls-Royce was not immediately available to respond to the most recent comments.

Rolls-Royce has pinpointed a "specific" component in the Trent 900 as the cause of a fire oil behind the explosion of the 4 novembre.Chaque A380 is powered by four engines.

The Qantas spokesperson said that she could not give a "definitive" answer on when his second Airbus return to heaven, refusing to confirm a report which said that he could stay out of action until at least at the beginning of December.

A permutation of the new-for-old engine program was one of the options examined with Rolls-Royce to speed the resumption of service for the A380, she added.

A380 double-decker, which carries 525 passengers and weighs 560 tons on take-off was hailed as the future of aviation distances to its commercial launch in 2007.

Boeing Dreamliner rival manufacturer is about three years behind after a series of parasites, including a fire on Board last week who was forced to cancel test flights.

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