A Qantas airline jumbo jet has made an emergency landing in Singapore because of an engine problem.

The Boeing 747-400 turned back shortly after take-off from Changi Airport, airline officials said.

It comes a day after a Qantas Airbus A380 was forced to make an emergency landing at the same airport after one of its engines exploded.

Qantas grounded its six-strong fleet of A380s and an investigation is under way into what caused the blowout.

The latest incident affected Sydney-bound flight QF6, which was carrying more than 400 passengers.

"Shortly after take-off the captain experienced an issue with one of its engines," a Qantas spokeswoman said.

The plane managed to land safely, she said.

Passengers who were onboard the flight said they heard a bang shortly after take-off

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