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Indonesian officials hold the box containing the flight-data recorder of Sriwijaya Air flight SJ-182 after it was retrieved from the Java Sea on Jan. 12, 2021.

Dita Alangkara/The Associated Press

Divers looking for a crashed plane’s cockpit voice recorder were searching in mud and plane debris on the seabed between Indonesian islands Wednesday to retrieve information key to learning why the Sriwijaya Air jet nosedived into the water over the weekend.

Indonesian navy divers on Tuesday recovered the flight data recorder from the jet that disappeared Saturday minutes after taking off from Jakarta with 62 people aboard. The information on both black boxes will be key to the crash investigation.

The 26-year-old Boeing 737-500 had resumed commercial flights last month after almost nine months out of service because of flight cutbacks caused by the coronavirus pandemic.

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The U.S. Federal Aviation Administration sent an airworthiness directive requiring operators of various Boeing 737 aircraft models, including the 737-500, to carry out engine checks before they can be flown again after being out of service. The order followed reports of engines shutting down in midflight because of corrosion in a key valve.

Indonesian divers believe they are close to finding the cockpit voice recorder of a Sriwijaya Air jet that plunged into the sea shortly after takeoff with 62 people onboard. Divers retrieved the plane's flight data recorder from the seabed on Tuesday. Reuters

Director General of Air Transportation Novie Riyanto said the plane was inspected on Dec. 2, including checks for engine corrosion, and was declared airworthy by Indonesia’s Transportation Ministry on Dec. 14. It resumed commercial flights on Dec. 22, according to ministry data. After returning to service, the plane made 132 flights, including the last one, according to aviation-data firm Flightradar24.

Aviation experts said planes that are parked for long stretches can be returned to flight safely.

“It depends on how the airline maintains the aircraft while it is grounded,” said William Waldock, an aviation-safety expert at Embry-Riddle Aeronautical University in Prescott, Arizona. He said airlines should run engines periodically and perform other maintenance. “It tends to keep everything lubricated, and it reduces the likelihood of corrosion building up in places you don’t want it to be.”

John Goglia, a former member of the U.S. National Transportation Safety Board, said preparing a long-grounded jet can be an intensive and expensive chore, taking a team of mechanics up to two weeks to check engines and make sure that electronic, hydraulic and fuel systems are operating and free of contamination.

“My initial thought” on learning about the plane’s long grounding, “was if they did the proper due diligence,” Goglia said, “because sometimes that stuff doesn’t show up for a little while.”

Navy officials have said the two black boxes were buried in seabed mud under tons of sharp objects in the plane’s wreckage, slowing the search efforts. A signal that may be from the cockpit voice recorder was detected near where the flight data recorder was recovered, between Lancang and Laki islands in the Thousand Island chain just north of Jakarta.

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At least 160 divers were deployed Wednesday to boost the search for the recorder that holds conversations between pilots.

More than 3,600 rescue personnel, 13 helicopters, 54 ships and 20 raft boats are searching in the area where the jet crashed and have found parts of the plane and human remains.

So far, the searchers have sent nearly 90 body bags containing human remains to police identification experts and anguished family members have been providing samples for DNA tests to the disaster victim identification unit who on Tuesday said they had identified four victims.

Indonesia’s aviation industry grew quickly after the nation’s economy was opened following the fall of dictator Suharto in the late 1990s. Safety concerns led the United States and European Union to ban Indonesian carriers for years, both since lifted due to better compliance with international aviation standards.

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