SYDNEY - QANTAS will keep its A380 fleet grounded for at least another 72 hours after discovering that engine oil leaks were the likely cause of an engine blowout during a Singapore-Sydney flight last week.

The airline's chief executive Alan Joyce said yesterday that leaks had been found in an engine of an A380 grounded at Changi Airport as well as in engines of two other superjumbos.

'On three of the engines, what we found are slight anomalies - oil where oil should not be on the engines,' he told a news conference here.

'We are just trying to check what the cause of that would be... At this stage Qantas does not expect to operate the A380 fleet for at least another 72 hours.'

Qantas, which has a fleet of six A380s, expects to clear its backlog of passengers and resume flights by today by switching to other planes and chartered aircraft, Mr Joyce said.

About 500 passengers remained stranded in Los Angeles while there were 30 in London, according to the airline.

A380s kept grounded