I saw the front wheel landing gear on the first landing.."Both engines may be broken" [Y transcript]

■ Host: Kim Sun-young Anchor, Jung Ji-woong Anchor
■ Starring: Jung Yoon-sik, Professor of Aviation Operations at Catholic Kwandong University

* The text below may differ from the actual broadcast content, so please check the broadcast for more accurate information. Please specify [YTN NewsNOW] when quoting.

◇Anchor> Various analyses of the time of the accident continue to emerge, but several other questions are being raised. So, after the first attempt, it was repeated again and the second landing was made, but during the first attempt, there were claims that the landing gear was down.

◆Yoon-Sik Jung> When the first approach was done normally, the instrument approach procedure came down normally. So if you look at the contents, the speed is reduced to the final approach speed. That means you can't slow down unless the landing gear and landing flap are all down. That's why it's all down, and when you repeat it, you basically raise the aircraft first and put the landing gear first. So the landing gear means, didn't all the hydraulic pressure and fly control work normally at that time? Until then. I'm looking at it like this.

◇Anchor> It's only a few minutes from the 2nd attempt. So, are you saying that the engine was working properly a few minutes ago?

◆ Jung Yoon-sik > That's right. Although the engine may have partially failed, even if the engine operates at a low RPM, the hydraulic pump operates, so it seems that the landing gear or flap could have been folded immediately.

◇Anchor> If the landing gear came down like that during the first attempt, why on earth would it go back up without landing in that situation?

◆Jung Yoon-sik> In the past, there was such a procedure. There was a procedure to get off right away from a nearby place. The procedure for getting off the two engines is very different from the procedure for getting off the two engines if one engine fails. Because there's a procedure where you have to speed up more and you have to turn the engine back off in the air and restart it, so you have to raise the altitude to 3000 or 4000 feet, and then you have to do that and come back down.

◇Anchor> You're coming down after normalizing it, right?

◆Yoon-Sik Jung> Yes, but during training these days, when a fire breaks out or an aircraft breaks down while almost entering the runway or airfield, it is supposed to get off right away. In the case of only 10 to 15 seconds, we are training the procedure to get off immediately without going around.

◇Anchor> It would be nice if you could show us the graphic by time a while ago. So the first try and the second try. We reorganized it by time zone. The first attempt was made at 8:54 as the first landing permit for the control tower was dropped. And the bird warning signal drops. And signal transmission such as aircraft location will be terminated. And at nine o'clock, second landing attempt. So, it's a six-minute difference from the first attempt. It means that the landing gear didn't come down at that time. So, a lot of things happened in six minutes, so what do you think happened?

◆Jung Yoon-sik> According to that photo, the landing gear and flap are all down to position 3. As the pilot goes around after three times, the go around takes precedence over Mayday for the pilot. So I would have told you to make a decision about the go round and declare Mayday by controlling the go round. At that time, if the assistant manager had a bird collision with Mayday, there would be additional bird collisions and things like that. So, while going from position 3 to position 4, if the two engines are alive, the plane is in a light state because it's almost out of fuel.

So, the angle of elevation is very high, so it can go up very quickly. But actually, in that picture, it's almost impossible to go up until you get to position three to four. That means the engine can't generate thrust. And coincidentally, the signal to send the location of the aircraft at position 3 has ended. Didn't the algae actually get inhaled at that time? Or before that. Then both engines, because if the electricity is cut off, both engines must fail at the same time. Of course, about 30 minutes is enough for the battery, but devices such as ADSB that transmit their location are not essential equipment, so it is likely to have been blocked. As a result, short circuits and other important electronic devices are likely to be alive. The rest may have been turned off.

◇Anchor> If we look at the situation and assume that a bird strike occurred, is it possible that not one engine, but two engines had problems at the same time?

◆ Jung Yoon-sik > That's right. The difference could be a few seconds, but either one engine was damaged by a collision and immediately became another, or both were simultaneously inhaled by a flock of birds. If you look at the picture over there, the left side also happens a little bit just before it happens big. Let's take a look. Before the size happens like that, it was a while ago. It looks like that, right? Didn't both of them have already been inhaled at the same time? So, it's said that the algae are inhaled, so the engine runs at hundreds of RPM and doesn't suddenly stop. Because it basically has centrifugal force. So it's hard for a pilot to figure out in a split second that the RPM has dropped and the engine has dropped. So I think that the engine was already in bad condition at that time, but it would have been difficult for pilots to fully grasp it.

◇Anchor> When people who witnessed that moment, anglers and such people saw landing gear during the first attempt. And you can also see the images captured in the photos, which is consequential, but I also think it's a little disappointing what it would have been like to try to land when the landing gear came down.

◆ Jung Yoon-sik> Aviation always has procedural problems, so if you got off right away like that, the pilot would have been punished and suspended even if he got off well. Because it violated the procedure. However, as a result, there is a regret that even if it goes wrong, it would have caused less damage to so many lives, but I think I probably did that because the procedure is to obey the law anyway.

Excerpted from
: Lee Sun Digital News Team Editor

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