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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?

#191

Ate Chuet made a quick analysis about the crash: https://youtu.be/xUllPqirRTI . The wall is there because that area is regularly flooded, it serves for the ILS system, and it is unfortunately over the minimum legal distance for such an object.

It doesn't make sense, though, that it would have to be concrete-reinforced above ground, and non-frangible, just because the area floods.

Maybe it's the cheapest way to engineer the ILS localizer to be flood-resistant? I don't know.

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

#192
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…

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

#193
post #106

Earlier quoted context omitted.

Youtuber’s Denys Davydov (ex pilot of same plane), pet theory: bird got into the engine, pilot by mistake shut off wrong engine, due to no engine - hydraulic pump was non-functional, which resulted in landing gear problems. (also something about ground effect)

So... the degree of control they have over the plane on landing suggests they have some degree of hydraulic control. It's possible they throttled down the wrong engine, but this is speculation at this time. Landing gear has a manual gravity release by the first officer that doesn't require the hydraulics. (But does take some time.) Ground effect was certainly involved (why they glided so far before touching down) but…

> Landing gear has a manual gravity release by the first officer that doesn't require the hydraulics. (But does take some time.)

You have to reach all the way back to do it, difficult to do with all the other shit going on.

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

#194

Earlier quoted context omitted.

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…

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

#195
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…

Are you talking about Asiana 162? https://en.m.wikipedia.org/wiki/Asiana_Airlines_Flight_162

That one touched down short of the runway at a much lower speed and configured for landing.

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

#196
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…

> 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.

Are you talking about Asiana Airlines 162? It hit localizer on its way to the runway because it came in too low. It then hit the runway, skidded on the runway, and stopped about halfway (after veering off the runway at the last moment).

If the same thing happened in Muan, the plane would have hit the localizer and then touched down, stopping in the runway. The fact that the localizer's base was concrete wouldn't have mattered because that's not where the plane would hit it.

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

#197
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.

At the moment before encountering the Muan Murder Wall, there were 181 souls alive, healthy, and uninjured aboard Jeju Air Flight 2216.

At the moment after encountering the Muan Murder Wall, there were 2 souls alive, one severely injured, and 179 corpses, most mutilated beyond all recognition.

Multiple things had clearly gone wrong with the flight, and we're going to have to wait for results of investigations to determine what crew and/or ATC actions and decisions contributed. But the principle lethal mechanism was impact with the immovable object of the Muan Murder Wall, and the ensuing instantaneous deceleration, disintegration, and conflagration of the aircraft and the souls aboard.

Even with multiple contributing factors, had the Muan Murder Wall not existed at that location, the aircraft would have overrun the runway and quite possibly airport perimeter, but would have slowed far more gradually and likely encountered structures less substantial than the Muan Murder Wall.

Wikipedia has a category page listing 55 runway overruns: https://en.wikipedia.org/wiki/Category:Airliner_accidents_an...>

Sampling from that we find that such accidents often result in no or few fatalities, particularly on landing. E.g.:

- Sriwijaya Air Flight 062 (2008): 130 souls, 124 passengers, 6 crew, 1 fatality, 23 injuries, 130 survivors. The aircraft struck a house, 3 of the injured were occupants. The sole fatality occurred some time after the incident. https://en.wikipedia.org/wiki/Sriwijaya_Air_Flight_062>

- China Eastern Airlines Flight 5398 (1993): 80 souls, 71 passengers, 9 crew, 2 fatalities, 10 injuries, 78 survivors. The aircraft experienced a tailstrike during a go-around attempt in heavy rain / high winds, broke in three, and came to rest in a pond. https://en.wikipedia.org/wiki/China_Eastern_Airlines_Flight_...>

- Philippine Airlines Flight 137 (1998): 130 souls, 124 passengers, 6 crew, 0 fatalities, 44 injuries, 130 survivors. Ground casualties: 3 dead, 25 injured, as aircraft ploughed through a residential area. https://en.wikipedia.org/wiki/Philippine_Airlines_Flight_137>

- American Airlines Flight 331 (2009): 154 souls, 148 passengers, 6 crew, 0 fatalities, 85 injuries, 154 survivors. Aircraft landed > 4,000 feet from the threshold with a tailwind in inclement weather. https://en.wikipedia.org/wiki/American_Airlines_Flight_331>

- TAM Airlines Flight 3054 (2007): 187 occupants, 181 passengers, 6 crew, 187 fatalities, 0 survivors. The exception in my (random) sample, this aircraft had a nonfunctional thrust reverser on the right engine. Lack of grooving on runway, heavy rain, hydroplaning, asymmetric thrust, and a large warehouse directly beyond the runway perimeter all contributed to the fatalities.

I've omitted one link I'd selected, Air France Flight 007 (1962) as that incident occurred on takeoff, not landing, where fuel load and flight profile greatly alter conditions and likely outcome, and isn't directly comparable. https://en.wikipedia.org/wiki/Air_France_Flight_007>.

If anyone cares to examine the 50 other listings on the Wikipedia category page, I suspect a similar patter of largely survivable overrun incidents prevails. The conspicuous lack of Muan Murder Walls seems significant.

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

#198

Earlier quoted context omitted.

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.

Yes, this one. Just like the others, this airport had a dangerous obstacle at a considerable distance from the runway. It's not a design goal of these runways to make such a landing survivable.

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

#199
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.

To continue your idiom, it's not a red herring, it's the elephant in the room. Seriously, I think the incident it's a hard lesson for airport designer and ICAO. For better civil aviation safety, the next airport runway should have ample room for safer aircraft landing without landing gears. Previously there's no real-time aircraft tracking requirement for passenger aircraft only for cargo, but after MH370 it's mandat…

Very, very few airport runways are long enough for a plane without brakes to land halfway and be fine.

It's simply not possible to build airports in useful places and guarantee three-mile runways.

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

#200
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.

And hitting the terminal would likely have resulted in far more loss of life. Are airport designers supposed to consider this as "an eventual certainty"?
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