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Electrical failure doesn't absolutely require that the engines fail. Supposing you short the electrical system?
Like, United Air Flight 232 had an uncontained engine failure that then severed all three hydraulic systems. The real problem that the pilots faced wasn't "we've lost one of our three engines", but rather the secondary damage to other aircraft systems resulting from that failure.
I assume that there's some level of electrical system redundancy, but then, the same was true of the hydraulic systems on UA232 -- it just required a really unlucky failure, with the engine shrapnel hitting multiple things, to cause the redundancy to also be wiped out.
looks for WP page
https://en.wikipedia.org/wiki/Jeju_Air_Flight_2216
I don't see how a hydraulic system failure alone would have caused the flight recorder to go offline.
But it does kinda sound to me like maybe they're talking about a bird strike causing some kind of secondary problems. Supposing a bird strike caused an uncontained engine failure -- which has happened before -- and that then caused secondary problems as bits of engine severed other things in the aircraft. What if those secondary problems were electrical in nature, rather than hydraulic?
EDIT: The landing was also apparently done without use of flaps. Looking online, it sounds like the lack of landing gear and flaps suggests that hydraulics weren't available. But I'd guess that a loss of electrical power to the hydraulic system, rather than the hydraulics themselves failing, could also explain such a situation.
EDIT2: If there's power loss, some aircraft have a ram air turbine that drops down to get a small amount of electrical power. I was thinking that that might have been usable as an indicator that electrical power was gone. In the video, I don't see that, but it sounds like a 737-800 doesn't have one. According to this, that aircraft is also apparently capable of being controlled to a limited degree even without electrical power due to mechanical connections:
https://aviation.stackexchange.com/questions/42565/does-a-boeing-737-800-have-a-ram-air-turbine-rat
That'd permit for them being able to bring the plane down the way they did, assuming that they didn't have electrical power.
Hydraulics and electric system are independent in commercial aircraft -- hydraulic pumps are directly driven from the engines, as are electrical generators. Redundancy is provided via independent loops/buses from each engine. A bird strike on its own is unlikely to be energetic enough to sever one of those independent systems, let alone all four. Losing both engines could do it, -- but again, they had enough thrust to attempt a go-around, so they weren't a glider immediately after the bird strike. The 737 is an old-school design, too, so most critical components have full manual reversion -- as long as you have airspeed and altitude enough to get to the runway, you can fly and land the plane just with cable controls and manual releases in the event of total electric and hydraulic failure.
I did a bit of reading from other sources and this particular aircraft predates the requirement for battery backup of the FDR and CVR, and the APU does not start up automatically on a power failure, so the failure chain for that part of the incident isn't as long as I initially thought. Still, lots of questions, and I think the simplest explanation so far is the aircrew panicking and making a survivable situation into a bloodbath.
I wonder if they had an electrical fire under the cockpit while flying.
The loose of systems normally segregated with multiple backup, the strange 2nd approach too fast without using the gears or flap...
Total chaos and panic... or system damaged because of the impact with birds.. or a drone? Damaged battery can produce a lot of heat and fire...
Hmm. Fair enough.
Looking at a couple other sources, it also sounds like ADS-B data stopped being transmitted prior to the landing. So that does seem like another data point besides the data recorder maybe cutting out arguing for some measure of electrical issues (which doesn't necessarily mean that the electrical system is damaged, but for power not to be going to part of the plane's systems).
https://www.flightradar24.com/blog/jeju-air-2216-muan/
EDIT: I did also see a pilot talking about the video and pointing out that while the crew didn't get flaps or gear, they managed to deploy at least one thrust reverser. I'm not sure what drives that (Do you need hydraulics? Electricity?), but it might say something about what was available to them.