Countries around Asia on Tuesday stepped up the search for an AirAsia plane carrying 162 people that is presumed to have crashed in shallow waters off the Indonesian coast, with Washington also sending a warship to help find the missing jet.
Soelistyo, head of Indonesia's search and rescue agency, told local television the search area between the islands of Sumatra and Borneo would be expanded. The air force said authorities would investigate an oil spill sighted on Monday.
Authorities would also begin scouring islands in the area as well as land on Indonesia's side of Borneo. So far the focus of the search has been the Java Sea.
The Airbus A320-200 operated by Indonesia AirAsia lost radar contact in poor weather on Sunday morning during a flight from the Indonesian city of Surabaya to Singapore. The plane could be at the bottom of the sea, Soelistyo said on Monday.
What happened to Flight QZ8501, which had sought permission from Indonesian air traffic control to ascend to avoid clouds, is still a mystery. Online discussions among pilots have centered on unconfirmed secondary radar data from Malaysia that suggested the aircraft was climbing at a speed of 353 knots, about 100 knots too slow in poor weather, and that it might have stalled.
Around 30 ships and 21 aircraft from Indonesia, Australia, Malaysia, Singapore and South Korea would search around 10,000 square nautical miles on Tuesday, officials said. They said the sea there was only 50 to 100 (150 to 300 feet) meters deep, which would be a help in finding the plane, which was carrying mainly Indonesians.
The US military said the USS Sampson, a guided missile destroyer, would be on the scene later on Tuesday. The US Defense Department said assistance to Indonesia "could include some air, surface and sub-surface detection capabilities".
"We stand ready to assist in any way possible," Pentagon spokesman Mark Wright said.
China's Defence Ministry said it had sent a warship to the South China Sea and planes "have begun preparatory work" for search operations. There have been no confirmed signs of wreckage so far.
Officials said one of the possible oil slicks seen on Monday turned out to be a reef and that while searchers had picked up an emergency locator signal off the south of Borneo no subsequent signal was found.
The plane, whose engines were made by CFM International, co-owned by General Electric and Safran of France, lacked real-time engine diagnostics or monitoring, a GE spokesman said. Such systems are mainly used on long-haul flights and can provide clues to airlines and investigators when things go wrong.
The plane's disappearance comes at a sensitive time for Jakarta's aviation authorities, as they strive to improve the country's safety reputation to match its status as one of the airline industry's fastest growing markets.
It also appears to be a third air disaster involving a Malaysian-affiliated carrier in less than a year, further denting confidence in that country's aviation industry and spooking air travelers across the region.
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