The plane was carrying 181 people from Thailand to South Korea when it issued a mayday call and belly-landed before hitting a barrier and bursting into flames, killing everyone aboard except two flight attendants pulled from the burning wreckage.
South Korean and US investigators, including from Boeing, have been combing over the crash site in southwestern Muan since the disaster on Sunday.
Both of the plane’s black boxes were retrieved, and for the cockpit voice recorder, “the initial extraction has already been completed,” said Deputy Minister for Civil Aviation Joo Jong-wan.
“Based on this preliminary data, we plan to start converting it into audio format,” he said, meaning investigators would be able to hear the pilots' final communications.
The second black box, the flight data recorder, “was found with a missing connector,” Joo said.
“Experts are currently conducting a final review to determine how to extract data from it.”
People watch the news regarding the plane crash at Seoul station. Photo / Getty Images
Officials initially pointed to a bird strike as a possible cause of the disaster, but they have since said the probe was also examining a concrete barrier at the end of the runway, which dramatic video showed the Boeing 737-800 colliding with before bursting into flames.
There have also been questions over possible mechanical failures, with local media reporting that the landing gear had deployed properly on Jeju Air Flight 2216’s first failed landing attempt at Muan airport before failing on the second.
The issue “will likely be examined by the Accident Investigation Board through a comprehensive review of various testimonies and evidence during the investigation process,” the Ministry of Land, which oversees civil aviation, said at a briefing.
Officials have said the bodies were extensively damaged by the crash, making the work of identifying remains slow and immensely difficult, even as investigators had to preserve crash-site evidence.
Mourners pay their respects at a memorial altar for victims of the Jeju Air plane crash at Muan Sports Park in Muan. Photo / AFP
But the country’s acting President said on Wednesday the process had finally been completed, and that more bodies had been handed over to relatives so that they could hold funerals.
“Overnight, the identification of all 179 victims was completed,” said acting President Choi Sang-mok, who has been in office less than a week.
“Our investigators, along with the US National Transportation Safety Board and the manufacturer, are conducting a joint investigation into the cause of the accident,” Choi said at a disaster response meeting Wednesday.
“A comprehensive analysis and review of the aircraft’s structure and the black box data will reveal the cause of the accident,” Choi added.
The US investigators had arrived Monday and headed straight to Muan, with the initial on-site joint probe focusing on a navigation system that assists in aircraft landings, known as a localiser.
The localiser, installed on a concrete structure at Muan International Airport, is the barrier that has been blamed for exacerbating the severity of the Jeju Air crash.
