Rescue crews have put no time limit on the search for the missing Malaysia Airlines plane, Australian Prime Minister Tony Abbott has said.
Ten aircraft and 10 ships are scouring the sea south-west of Perth for debris from the airliner.
Several floating objects have been found during the search in recent days, but none is believed to belong to the missing plane.
The signal from the plane’s flight-data recorder will only last about 30 days after the Malaysia Airlines’ flight disappeared on March 8 with 239 people on board.
The search teams are deploying a special tool known as a "towed ping locator" to find the recorder, which will be used once debris from the plane has been found.
