The Australian Transport Safety Bureau, coordinating the multinational search for flight MH370, the missing Malaysia Airlines Boeing 777, had planned to complete the mission this month.

But winter weather has slowed down the sea-bed search for the main aircraft wreckage.

The ATSB says: “It is now anticipated it may take until around August to complete the 120,000 square kilometres, but this will be influenced by weather conditions over the coming months, which may worsen. More than 105,000 square kilometres of the seafloor have been searched so far. In the event the aircraft is found and accessible, Australia, Malaysia and the People’s Republic of China have agreed to plans for recovery activities, including securing all the evidence necessary for the accident investigation.”

The ATSB statement continues: “Consistent with the undertaking given by the Governments of Australia, Malaysia and the PRC in April last year, 120,000 square kilometres will be thoroughly searched. In the absence of credible new information that leads to the identification of a specific location of the aircraft, Governments have agreed that there will be no further expansion of the search area.”

The investigators have now examined half a dozen pieces of floating wreckage that washed up on beaches, mostly on the shores of islands in the western Indian Ocean or off south-eastern Africa. The have all been determined either to be definitely or almost certainly from the missing Malaysia 777. They include a flaperon, a wing flap section a flap track fairing, a part from a horizontal stabiliser, a piece of engine cowling, and a section of laminate material from the cabin trim of the aircraft.

So the aircraft is in the Indian Ocean, but if it is not found in the area where the sparse data the authorities have at their disposal suggest it should be, they have decided that the search will stop there.