Indonesian search team raises tail of crashed AirAsia plane

The tail of AirAsia QZ8501 passenger plane is seen on the deck of the Indonesian Search and Rescue (BASARNAS) ship Crest Onyx after it was lifted from the sea bed, in the Java Sea January 10, 2015. [Photo/Agencies]

Strong winds, currents and high waves have been hampering efforts to reach other large pieces of suspected wreckage detected by sonar on the sea floor, and to find the remaining victims.

On Friday, Supriyadi said the pings were believed to have been detected about 1 km (half a mile) away from the tail.

If the recorders had become separated from the tail they could be covered in mud, making the search in the murky water that much more difficult, he said.

"The pings can only be detected within a radius of 500 metres (1,640 feet) so it can be a large area to cover," he said.

If and when the recorders are found and taken to the capital, Jakarta, for analysis, it could take up to two weeks to download data, investigators said, although the information could be accessed in as little as two days if the devices are not badly damaged.

While the cause of the crash is not known, the national weather bureau has said seasonal storms were likely to be a factor.

The plane was travelling at 32,000 feet (9,753 metres) and had asked to fly at 38,000 feet to avoid bad weather. When air traffic controllers granted permission for a rise to 34,000 feet a few minutes later, they received no response.

The pilots did not issue a distress signal.

The Indonesian captain, a former Air Force fighter pilot, had 6,100 flying hours and the plane last underwent maintenance in mid-November, said the airline, which is 49 percent owned by Malaysia-based budget carrier AirAsia.

The AirAsia group, including affiliates in Thailand, the Philippines and India, had not suffered a crash since its Malaysian budget operations began in 2002.