New details about the crashed Lion Air jet's previous flight cast more doubt on the Indonesian airline's claim to have fixed technical problems, as hundreds of personnel searched the sea for a fifth day Friday for victims and the plane's fuselage.
Underwater footage on Friday showed debris from the plane wreckage strewn across the sea floor as divers continued their search efforts for bodies and debris.
Hundreds of personnel and dozens of vessels including specialized ships with sonar and other detection technology are involved in the search effort in seas northeast of Jakarta.
Four ping locators - which are lowered into the sea to listen for the black box's signal - are now being used to locate the cockpit voice recorder after an additional unit was contributed by the US.
The brand new Boeing 737 MAX 8 plane plunged into the Java Sea on Monday, just minutes after taking off from the Indonesian capital, Jakarta, killing all 189 people on board.
More than 60 body bags containing human remains have been sent to police medical experts for identification since the search began, but as of Thursday only one victim has been identified and buried.
Families of those on board have offered their DNA for testing.