AN Air Canada plane has landed after being forced to return to Sydney airport when smoke billowed out in a galley on board.

Air Canada Flight AC34 departed Sydney Airport at at 10.25am en route to Vancouver and Toronto and reportedly experienced a fire in the galley which could not be contained.

Fuel was dumped over Hornsby and Longreef before the plane returned to Sydney.

Listen to Australian Air Traffic Control

At 11.53am the captain reported that he had completed the fuel dump.

The plane landed shortly after 12.10pm on Thursday, a spokesman the Australian Transport Safety Bureau said.

It is understood the passengers were taken off the plane and stood in a waiting area while the aircraft refuelled.



The plane departed Sydney Airport again at 1.50pm.

"Air Canada reported smoke in the cabin and conducted a fuel dump," the ATSB spokesman told AAP.



He said the incident would be investigated further.



A spokesman for Sydney Airport told AAP said the plane was doing an "air return".



"It's doing an air return... an air return usually means they are coming back as a precaution," he said.

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Air Canada's general manager for Australia and New Zealand, Jeannie Foster, said there was smoke in the plane but no fire.



"There was some smoke seen in the cabin by the crew, actually it was coming from the oven," she told Macquarie Radio.

media_camera The Air Canada flight lands safely at Sydney International Airport after dumping fuel. Picture: Phil Hillyard



"It was just smoke coming from an oven, there were no injuries."



There were 264 passengers on board the flight, including four infants.



"The captain didn't declare an emergency," Ms Foster said.



"Obviously he has had to dump fuel as it is a 15 hour flight to Canada... and you can't land with a heavy plane."



Fire and Rescue NSW told AAP it wasn't a "major incident" and emergency crews were not called out to the airport. It is not known if any dangerous cargo was on board the Boeing 777-233LR.

Here is a Youtube clip inside the Boeing 777-233LR taking off from Sydney in 2009.

Two years ago, at least 11 passengers and four crew members were injured when the Air Canada Flight 34 from Sydney to Vancouver hit severe turbulence caused by a thunderstorm about one hour northeast of Honolulu.

Meanwhile, an Asiana Airlines Boeing 744 cargo plane has crashed in waters off South Korea's southern Jeju island killing two, Yonhap news agency reports.



Debris from the aircraft, which had taken off from Incheon at 3.05am local time on Thursday, headed for Pudong in east China, was found by a coast guard patrol boat in the sea about 107 kilometres west of Jeju city, Yonhap said.



The plane carrying a pilot and one crew disappeared from radar at 4.09am while returning to Jeju airport after reporting mechanical trouble, it said.

Originally published as Air Canada plane lands, fire out