January 11th, 2025

Black boxes from Jeju Air 2216 stopped recording four minutes before crash

The Jeju Air crash in South Korea on December 29, 2024, killed 179 people. Flight recorders stopped before the incident, complicating investigations into a possible bird strike and runway safety issues.

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Black boxes from Jeju Air 2216 stopped recording four minutes before crash

Investigators have revealed that the flight recorders from the Jeju Air passenger jet that crashed in South Korea on December 29, 2024, stopped recording approximately four minutes before the aircraft belly-landed at Muan International Airport, resulting in a fireball and the deaths of 179 individuals. The cockpit voice recorder (CVR) and flight data recorder (FDR) ceased functioning just before the disaster, leaving officials uncertain about the reasons for the failure. The South Korean transport ministry emphasized the importance of these devices for accident investigations but noted that they will rely on various data sources to determine the cause of the crash. The damaged FDR has been sent to the U.S. National Transportation Safety Board for further analysis, as local authorities were unable to extract data from it. The crash is the deadliest aviation incident in South Korea since 1997, and the investigation is expected to take several months. Preliminary reports indicated that the pilot made a mayday call referencing a "bird strike" and that the control tower had warned of birds in the vicinity. Additionally, concerns have been raised about the proximity of a concrete embankment to the runway, which may have contributed to the accident. South Korean police have also conducted raids on Jeju Air's office and the airport operator as part of the ongoing investigation.

- The Jeju Air crash resulted in 179 fatalities, making it South Korea's deadliest aviation accident in nearly three decades.

- The flight recorders stopped functioning four minutes before the crash, complicating the investigation.

- The investigation will take months, with data analysis from the U.S. National Transportation Safety Board.

- Preliminary findings suggest a possible bird strike and issues with runway safety features.

- Police have raided Jeju Air's office as part of the investigation into the crash.

Link Icon 8 comments
By @SteveVeilStream - 4 months
One possible scenario is that they had a bird strike on one engine but then accidently turned the working engine off instead. Full loss of power from both engines could have taken the data recorder offline in an older aircraft like this one. With both engines off, they may have panicked to try to complete a tight turn to return to the airport and to maintain altitude to make it to the runway. It's possible the landing gear was forgotten but also possible that it was intentional (to extend glide.) It's too early to know anything with certainty but I suspect that the investigation will show that a different set of choices would have allowed them to put the plane down safely (for example by continuing with the initial approach.) Even in that case, they may not have been to blame - for example they may have been following a standard procedure that should be revisited.
By @marze - 4 months
How much would it cost to create a data recorder with a built-in battery? Like a mini UPS that would power the recorder for one hour, if external power failed.

The antiquated technology in jets is mind boggling.

By @throwaway290 - 4 months
Same physical airplane was in the news a couple of days before the crash for declaring an emergency. Probably coincidence? https://www.ekn.kr/web/view.php?key=20241228028449548
By @DoctorOetker - 4 months
If there was a loss of power, would'nt the passenger cabin have gone dark?

If that is really the case, I would have expected the passengers to have collectively sent text messages informing friends or relatives that "omg, loud noise, lights went off!".

4 minutes would be plenty of time to send messages.

We would have read this information much sooner after the crash, ergo I don't believe there was a power loss.

I fear the data was deleted by some party.

By @ggm - 4 months
I didn't know that was possible. Well sure, almost anything is possible but, this begs questions: how often does this happen, and is there a formal check at some granularity outside of crash events, to check if a black box recorder is working? What's the failure rate?

I'm not pushing conspiracy theory, I'm just a bit aghast the mechanism designed to log things for disaster analysis itself can have .. catastrophic failure before an event.

4 minutes is an eternity. This can't be down to buffer behaviour and the event itself surely?

https://www.pprune.org/accidents-close-calls/663324-jeju-737... has discussion. Yes, catastrophic loss of power takes them off-line. Some kind of UPS like capacity seems necessary.

By @et-al - 4 months
It seems like we're in a period of realizing that airplane systems aren't as robust as we've assumed. E.g. MH370's satellite uplink also lost power.
By @aaron695 - 4 months
It was a 2009 plane so didn't have to have battery backup which was 2010 - https://www.pprune.org/11803679-post1676.html

Age - https://www.planespotters.net/airframe/boeing-737-800-hl8088...

Source it stopped recording - https://www.molit.go.kr/USR/NEWS/m_72/dtl.jsp?id=95090593

By @pfannkuchen - 4 months
Can we believe the SK government here? If the popular theories about what happened turn out to be correct (e.g. panic, wrong engine turned off), the black box contents would produce an incredible loss of face for SK. Convenient for it to have failed as well.