Indonesia recovers data from doomed Lion Air flight

Data has been recovered from the black box of the doomed Lion Air jet, with the last information recorded around the time the plane lost contact.

Tyres and turbines from the crashed Indonesian Lion Air jet have been found, but not the fuselage. Source: AAP

Indonesian authorities have downloaded data from a back box recorder of the Lion Air jet that crashed into the Java Sea last week, officials say.

"We have successfully retrieved information from the flight data recorder," said Nurcahyo Utomo, the head of an investigation being led by Indonesia's transport safety committee.

Officials unload pieces of wreckage. Source: AAP

Utomo said investigators - including from the US, Singapore and Australia - had retrieved 69 hours of data from 19 flights carried out by the Boeing 737 aircraft, including the JT610 flight that crashed into waters off Karawang, West Java.

The last recorded data is from October 29 at 6.31am Western Indonesia Time, Utomo told a press conference on Sunday.

The Lion Air plane took off from Jakarta's Soekarno Hatta airport at 6.20am and lost contact with air traffic control about 13 minutes later as it crashed into the sea off Tanjung Karawang, about 70 kilometres east of Jakarta.

All 189 people on board were killed.

Utomo said search and rescue divers were still searching for the second black box, which contains the voice cockpit recording.

He said a strong signal from the second black box was detected on Saturday but divers were unable to locate it, possibly because it was buried in mud.

The national search and rescue agency Basarnas has so far handed over 105 body bags containing human body parts retrieved from the search area.

However police forensic teams have only been able to identify 14 bodies.

Officials handle body bags containing remains of passengers from the Lion Air flight. Source: AAP

Head of Basarnas Muhammad Syaugi told a press conference on Sunday that the agency has extended the search operation by three days as divers continue to search for more remains and the plane's main fuselage.

So far, the operation has only managed to collect parts broken off from the aircraft's main body, including the front and back tyres and two turbines.

"Hopefully with increased synergy between the police, the military and the search and rescue agency, we can soon conclude the search operation," Syaugi said.

The operation will use remotely operated underwater vehicles.