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Why was there a wall near runway at S Korea plane crash airport?

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Re: Why was there a wall near runway at S Korea plane crash airport?

#181
post #96
post #70

Earlier quoted context omitted.

Absolutely no. There is the suspicion that they even shut down the good engine after the bird strike.

> Absolutely > suspicion "suspicion" seems like fragile grounds for "Absolutely".

It objectively wasn't a safe landing. How that happened is anyone's guess, until the investigation comes out.

Re: Why was there a wall near runway at S Korea plane crash airport?

#182

Earlier quoted context omitted.

We don't know that for sure yet. The gear being down is based on an eyewitness report, as far as I understand from Juan Browne. The readout from the flight data recorder will provide a more trustworthy account.

If I recall right the video that purportedly shows the bird strike shows the gear down.

The bird strike (well, compressor stall) video I saw appears to show gear up.

https://x.com/Global_Mil_Info/status/1873181671375421703

Re: Why was there a wall near runway at S Korea plane crash airport?

#183

Earlier quoted context omitted.

>Tell her she is wrong. It's an international airport with commercial traffic. 11th most busiest airport in the country.[0] 11th out of 15 total, servicing about 4 flights / 630 passengers per day on average using the very same statistics you've linked. That sounds like a pretty small airport to me, both in absolute and relative terms. "International airport" means very little outside of large nations like the US, Ru…

"International airport" means very little outside of large nations like the US, Russia, Canada, Brazil or China. In the U. S., at least, "international" just means there's a customs station. There are some pretty small airports that have "international" in the name. Fairbanks, Alaska, comes to mind.

Or Burlington, VT, which doesn't even have scheduled international service.

Re: Why was there a wall near runway at S Korea plane crash airport?

#184
post #149

The wall is a red herring. The plane landed halfway down the runway at high speed. Something bad is going to happen if you do that at any runway on earth. In SFO you'll end up in the bay or hit the terminal depending on the orientation. In Toronto you'll crash into a highway. Stop looking at the wall and look at the minutes before the crash.

Occam's razor: the wall is most probably the cause of the unnecessary explosion that killed 179 people. The airport built ILS, or localizer, on unnecessarily over-engineered concrete structure where there shouldn't have been any obstruction. The ILS are supposed to be built on level surface or "frangile" structure so they can be easily destroyed when there is an overrun. There are reportedly at least 4 other airports with such obstructions in South Korea -- at Yeosu, it's 4 meters high (also concrete foundation)[1].

There was a similar accident in Hiroshima, Japan several years ago: Airbus A320-200 skidded past the end of the runway at similar speed and struck down ILS. It eventually stopped -- damaged the airplane but no fatality.

1. Localizer at Yeosu Airport, similar to Muan's, raises safety concerns, 2025.01.02 (23:58), KBS News.

Re: Why was there a wall near runway at S Korea plane crash airport?

#185
post #89

I'll recite an avherald comment: If you look at "Video of aircraft after touchdown sliding along the runway and impacting the fence:", you will find out that it took them ~1.7 sec from leaving the tarmac until they hit the construction. If you measure the distance on Google earth you come up with ~140m. That means they hit the construction with roughly 296km/h or 160 knots. If it wasn't the construction it would have…

> it took them ~1.7 sec from leaving the tarmac until they hit the construction. If you measure the distance on Google earth you come up with ~140m. That means they hit the construction with roughly 296km/h or 160 knots. (Assuming the math is correct:) That's the average speed over that distance. The plane would have been slowing down the whole time.

It might not have been slowing down much in that time due to a thing called Ground Effect. Since the wheels weren't down, the flat body of the bottom of the aircraft + wings would have actually reduced drag and cushioned the plane for a bit, causing it to not slow down as much as you would assume.

Re: Why was there a wall near runway at S Korea plane crash airport?

#186
post #178
post #173

Earlier quoted context omitted.

No one is discouraging investigation of the other factors or thinks they aren't significant.

Except they are and they do. The quoted "air safety expert" in the BBC article essentially says the landing was "as good as can be" and that most or all of the people onboard would have survived if the localizer berm wasn't present.

The full quote you're referencing but truncating is "as good as a flapless/gearless touchdown could be." This is, uh, light praise? "It's a pretty great shit sandwich."

None of these people are calling for not investigating the other factors.

Re: Why was there a wall near runway at S Korea plane crash airport?

#187

Earlier quoted context omitted.

> a few hundred meters would do nothing. I think the estimates I saw were over 150 knots Show you working. Not feelings because people don't have intuition for such unusual motion. You could equally have said "a few hundred meters would be enough."

150 knots is like 77 meters a second, a 747 can do like 2m/s^2 braking giving 35 seconds to stop, 1500 meters required. Stopping time: t=v/a, t=77/2. Stopping distance: d=v^2/2a, d=77^2/2*2

Now account for the fact that the plane had no brakes since the landing gear were not deployed ...

Re: Why was there a wall near runway at S Korea plane crash airport?

#188
post #149

The wall is a red herring. The plane landed halfway down the runway at high speed. Something bad is going to happen if you do that at any runway on earth. In SFO you'll end up in the bay or hit the terminal depending on the orientation. In Toronto you'll crash into a highway. Stop looking at the wall and look at the minutes before the crash.

What a lame comment. This isn't how aviation safety is managed. You expect planes to land halfway down the runway at high speed and out of control. It's an eventual certainty.

> In SFO you'll end up in the bay or hit the terminal depending on the orientation. In Toronto you'll crash into a highway.

Ending up in a bay or crashing into a highway would likely have resulted in far less loss of life.

Re: Why was there a wall near runway at S Korea plane crash airport?

#189
post #149

The wall is a red herring. The plane landed halfway down the runway at high speed. Something bad is going to happen if you do that at any runway on earth. In SFO you'll end up in the bay or hit the terminal depending on the orientation. In Toronto you'll crash into a highway. Stop looking at the wall and look at the minutes before the crash.

Most of the busiest airports in the world have some sort of dangerous obstacle roughly the same distance from many of their runways. Ravines, buildings, hills, water, trains/trams, etc, etc.

But not this one. Not this one. Without the wall, it's likely many more would be alive.

Re: Why was there a wall near runway at S Korea plane crash airport?

#190
post #8

I don’t know why people keep fixating on this. Airplanes can’t skid out of the airport into the surrounding city. Mistakes were made, but this isn’t one of them. I suspect it is people trying to deflect blame from pilot error, which seems by far the most likely issue. They did none of the things you should do to stop a plane.

Like doing what things? What I read so far is that they suspect the pilot had control issues. I don't think people who say that it's a bad idea to have a concrete wall at the end of the runway argue the plane should make its way to a nearby motorway. I think most refer to using EMAS, ie a crushable concrete floor in which the plane sinks and stops.

EMAS is designed to crush under the pressure of all of the aircraft's weight pushing down on the relatively narrow contact area of the tires. There were no tires in this case. I am unaware of an EMAS that has been designed or tested for the far more broadly distributed weight of a belly landing.
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