The Boeing 767 with 234 passengers on board returned to Perth, in Western Australia, 10 minutes after taking off to fly to Melbourne, the Australian Associated Press said.

“Soon after take-off, the flight crew detected some vibration in the left-hand engine of the Boeing 767 aircraft,” Qantas spokesman Simon Rushton told AAP.

The incident came a day after Qantas grounded its entire fleet of Airbus A380 superjumbos after a mid-air blowout a week earlier on one of the planes' Rolls-Royce engines prompted serious safety worries. The Boeing was powered by GE engines, AAP reported, and Rushton told the news agency last week's A380 blowout had not influenced the crew's decision to turn back.

“Our flight crews are absolutely trained to respond in a very conservative way to any in-flight issues and that's exactly what they did in this case,” Rushton said.

Rolls-Royce on Friday pinpointed the failure of a “specific component” in its Trent 900 engine as the cause of an oil fire which forced the A380 to make an emergency landing last week.

Singapore Airlines put three of its A380s out of action on Wednesday to replace engines after finding unexpected oil stains during tests, while Germany's Lufthansa said it would replace one A380 engine as a precaution.

Singapore Airlines said on Friday it has put one of its three affected A380 aircraft back into service after precautionary engine changes. SIA spokesman Nicholas Ionides said the second aircraft is expected to return to service by Saturday.

“Singapore Airlines has completed precautionary engine changes as prescribed by Rolls Royce on one of our three A380 aircraft, which has returned to service,” Ionides said in an e-mail statement. “A second A380 is expected to be returned to service by tomorrow (13 Nov 2010), after an engine change is completed. Work on the third A380 aircraft is ongoing,” he added without elaborating when the third aircraft will return to service.