The Australian airline, Qantas, has said it has found "slight anomalies" on three Airbus A380 engines and is keeping its fleet¹ of six passenger jets² grounded for further checks.

澳洲航空公司称已在三架A380空中客机的引擎上发现一些“小异常”并将对另外六架客机进行进一步检查。

Chief executive³ Alan Joyce said there "was oil where oil shouldn't be on the engines" of two of the super-jumbos（庞然大物） .

Qantas was "trying to check what the cause of that would be", he added.

A similar engine broke apart in flight on Thursday, forcing a Qantas A380 to make an emergency landing⁴ in Singapore.

After the incident - the first since the aircraft came into service in 2007 - the airline began checking their Rolls-Royce Trent 900 engines.

On Monday, Mr Joyce said engineers had found oil in three engines, which was unusual given that they were only two years' old.

"These are new engines on new aircraft and they shouldn't have these issues at this stage, so it's given us indication⁵（指示，象征） of an area for us to focus into," he told the Australian Broadcasting Corporation⁶.

"We are keeping an open mind on it but... We think it could have been a materials issue on the engine, or a design issue."

Mr Joyce said he hoped to have the A380s back in the air soon.

"We still believe with the progress we are making - this is days not weeks - but we will take as long as it needs to in order that we are absolutely comfortable the aircraft is safe to fly," he added.

In an unrelated incident on Friday, a Qantas Boeing 747 - also equipped with Rolls-Royce engines - was forced to return to Singapore with an engine problem after taking off.

Mr Joyce said it was "not a safety issue" and that there were no plans to ground the airline's fleet of 747s.

Rolls-Royce, the British firm which makes the engines for the Qantas planes, saw its share price fall by nearly 5% on Friday.