By Cindy Silviana

JAKARTA (Reuters) – Indonesian authorities announced on Monday that they would immediately begin to download the contents of a cockpit voice recorder (CVR) from a Lion Air plane that will Crashed into the sea near Jakarta more than two months ago, killing the 189 people on board.

This accident was the world's first of a Boeing Co 737 MAX aircraft and the deadliest of 2018, and the recovery of the second black box of the aircraft in the Java Sea north of Jakarta on Monday could provide an account of the last acts of the pilots of the condemned jet.

"We have our own laboratory and staff to do it," Haryo Satmiko, deputy chief of the Transportation Safety Committee, told Reuters.

Satmiko said that it had taken up to three months in the past to download, analyze and transcribe the contents of the recorders.

Contact with flight JT610 was lost 13 minutes after takeoff of the capital, Jakarta, on 29 October, heading north, towards the mining town of Pangkal Pinang.

A preliminary report of the Indonesian Transport Safety Commission concerned the maintenance and training of airlines, as well as the reaction of a Boeing anti-stall system and a recently replaced sensor, but did not give any cause to the accident.

A group of victims' parents urged the Transportation Safety Committee to reveal "everything that has been registered" and work independently.

Lt. Col. Navy Agung Nugroho told Reuters that a weak recorder signal had been detected several days ago and that it had been found buried in soft mud at bottom of the sea, in a water of about 30 meters deep.

"We do not know what damage there is, but it bears obvious scratches," Nugroho said.

The photos provided by a transport agency official showed bright orange flaking paint stains on the CVR's memory unit, but no significant dents.

Nurcahyo Utomo, a security committee investigator, told reporters that downloading the data should not take more than five days. However, in case of a problem, the CVR would be sent to the manufacturer.

"We hope this will be possible as soon as possible, as all Boeing operators are waiting," Utomo said, adding that the investigators hoped to complete the full report in the year following the crash.

After the recovery of the CVR, officials said it was not planned to continue searching for other parts of the wrecked aircraft, including an angle of attack sensor suspected of being defective.

The Navy Nugroho said that human remains had been found near the location of the CVR, about 50 meters from the other flight data recorder (FDR), the other recorder of Flight data (FDR), three days after the accident.

The investigators brought a naval ship last week after an effort of 38 billion rupees over ten days ($ 2.70 million). An effort funded by Lion Air failed to find the tape recorder. Bureaucratic bickering and funding problems hindered initial research.

The CVR of L3 Technologies Inc. was designed to send acoustic pings for 90 days after a fall in the water, according to an online manufacturer 's brochure.

This would mean that after January 27, the investigators could have faced a much bigger problem by finding the buried CVR with much of the wreckage in the mud at the bottom of the sea.

Boeing did not respond immediately to a request for comment.

Since the accident, Lion Air has had to deal with tight control over its maintenance and training standards, and relatives of the victims have engaged in at least three lawsuits against Boeing.

(Additional report of Agustinus Beo Da Costa, Writing of Fergus Jensen and Tabita Diela, Edition of Robert Birsel and Darren Schuettler)