Indonesian navy divers have recovered the cockpit voice recorder of a Sriwijaya Air jet that crashed into the Java Sea in January, killing all 62 people on board, Indonesian officials said yesterday.
Indonesian Minister of Transportation Budi Karya Sumadi said that divers retrieved the cockpit recorder at about 8pm on Tuesday, near where the flight data recorder was recovered three days after the accident.
The contents of the voice recorder were not immediately available.
Photo: AP
However, the device might help investigators determine what caused the Boeing 737-500 to nosedive into the ocean in heavy rain shortly after it took off from Jakarta on Jan. 9.
If the voice recorder is undamaged, it might tell investigators what the pilots were doing — or failing to do — to regain control of the plane during its brief, erratic flight.
Searchers have recovered plane parts and human remains from an area between Lancang and Laki islands in the Thousand Islands chain, just north of Jakarta.
The flight data recorder tracked hundreds of parameters showing how the plane was being operated.
Most retrieval efforts ended about two weeks after the crash, but a limited search is continuing for the missing memory unit of the cockpit voice recorder, which apparently broke away from other parts of the device during the crash.
The bright orange voice recorder was taken to Jakarta and given to the Indonesian National Transportation Safety Committee (KNKT), which is overseeing the accident investigation.
“We hope the KNKT could share information about what is contained in this VCR [videocassette recorder] to improve our aviation safety,” Sumadi said.
KNKT Chairman Soerjanto Tjahjono said that the device would be taken to the investigators’ “black box” facility.
It would take five to seven days to dry and clean the device, and to download its data, he said.
Without the data, “it would be difficult to determine the cause of the plane crash,” Tjahjono said. “We would disclose it transparently to avoid similar accidents in the future.”
Rear Admiral Abdul Rasyid Kacong, the navy’s western region fleet commander, said that the voice recorder was buried under 1m of seabed mud at a depth of 23m.
Divers removed debris and carried out “desludging” operations to reach the voice recorder, Kacong said.
Data from a preliminary investigation report, which did not state any conclusions, showed that the plane’s left engine’s throttle lever moved backward on its own while the autopilot was engaged, reducing the power output of that engine before the jet plunged into the sea.
The report provided new details on persistent problems with an autothrottle on the 737-500 Sriwijaya Air jet and the airline’s efforts to fix them.
An autothrottle can be used by pilots to set the speed automatically, thereby reducing workload and wear on the engines.
The 26-year-old jet had been out of service for almost nine months because of flight cutbacks due to the COVID-19 pandemic before resuming commercial flights in December last year.
The disaster has reignited concerns about safety in Indonesia’s aviation sector, which has grown quickly along with the economy since the fall of long-time Indonesian president Suharto in the late 1990s.
The US in 2007 banned Indonesian carriers from operating in the country, but lifted that restriction in 2016, citing improved compliance with international aviation standards.
The EU lifted a similar ban in 2018.
Sriwijaya Air had had only minor safety incidents in the past, although a farmer was killed in 2008 when a plane went off the runway while landing due to a hydraulic issue.
In 2018, a Boeing 737 MAX 8 jet operated by Lion Air crashed shortly after taking off from Jakarta, killing 189 people. An automated flight-control system played a role in that crash, but the Sriwijaya Air jet did not have that system.
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