Nobody's suggesting hydraulic failure in the 20 page pprune thread about the S. Korea crash. The gear could have been lowered manually but the crew didn't begin to attempt it. This vid by a 737 pilot is instructive https://www.youtube.com/watch?v=w1r8dl4RqMw&t=1s
Some of the sensible pilots at pprune have advanced a theory that one engine was out and the other one was out or nearly out. If that's what happened the pilots wouldn't want to lose altitude by dropping flaps and gear until they were certain they'd reach the runway. But at the crucial moment they were overwhelmed and didn't do it.
Nobody's suggesting hydraulic failure in the 20 page pprune thread about the S. Korea crash. The gear could have been lowered manually but the crew didn't begin to attempt it. This vid by a 737 pilot is instructive https://www.youtube.com/watch?v=w1r8dl4RqMw&t=1s
There's a new vid of the landing https://streamable.com/r5p6pu
Some of the sensible pilots at pprune have advanced a theory that one engine was out and the other one was out or nearly out. If that's what happened the pilots wouldn't want to lose altitude by dropping flaps and gear until they were certain they'd reach the runway. But at the crucial moment they were overwhelmed and didn't do it.