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A Chinese Ilyushin IL-76 lands in Perth after returning from the search for missing Malaysia Airlines Flight 370. Photo: AP

Tropical cyclone halts air search for Malaysian Airlines Flight MH370

A tropical cyclone caused the air search for the missing airliner to be suspended on Tuesday, as a US submarine neared the end of its undersea search

A tropical cyclone heading south over the Indian Ocean caused the air search for the missing Malaysian Airlines Flight MH370 to be suspended on Tuesday, as a US submarine drone neared the end of its undersea search without finding any sign of wreckage.

The daily air and sea sorties have continued for a week since Australian authorities said they would complete that component of the search for the jet aircraft, which disappeared on March 8 with 239 people on board.

But on Tuesday, hours after authorities said up to 10 military aircraft and 10 ships would join the day’s search, they said the air search had been suspended because of poor weather as a result of Tropical Cyclone Jack.

“It has been determined that the current weather conditions are resulting in heavy seas and poor visibility, and would make any air search activities ineffective and potentially hazardous,” the Joint Agency Co-ordination Centre said in a statement.

The ships involved in the day’s search about 1,600 kilometres northwest of the Australian city of Perth would continue with their planned activities, the centre added.

The setback occurred as the US$4 million US Navy unmanned submarine Bluefin-21 was scheduled to complete its mission with search officials confirming the device had yet to find any sign of wreckage from the flight.

The authorities have found no conclusive evidence of the aircraft’s ultimate location but believe sonar signals, or “pings”, detected in the Indian Ocean search area several weeks ago may have emanated from the plane’s “black box” recorder.

But after more than a week of daily sweeps of the largely unmapped stretch of ocean floor some 4.5 kilometres deep, the drone is yet to produce any sign of wreckage, officials said on Tuesday.

The Australian Navy ship HMAS Perth is refuelled at sea during the ongoing search. Photo: Reuters

On April 18, the Joint Agency Co-ordination Centre said that the Bluefin’s search of the target area, a circle with a 10-kilometre radius, would probably end in as little as five days.

As the remote-controlled submarine was expected to complete its ninth mission on Tuesday, four days after the co-ordination centre gave the five-day time frame, the centre confirmed that it had covered about two thirds of its target search area and had found “no contacts of interest”.

The dawning prospect of the Bluefin-21, initially seen as the search’s most promising aid, completing its mission without a trace of the missing aircraft has authorities under pressure to determine what strategy to take next.

The daily search involving some two dozen nations is already shaping up to be the most expensive in aviation history.