Did you raise the "concrete azimuth" disaster at Muan Airport?pointing out a violation of the regulations

■ Host: Anchor Jang Won-seok, Anchor Yoon Bori
■ Starring: Jeong Yun-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 News PLUS] when quoting.

[Anchor]
Attention is focusing on finding out the cause of the accident in the Jeju Air passenger plane disaster. Let's review the related information with Jung Yoon-sik, a professor of aviation operations at Catholic Kwandong University. Please come in. I just connected with a reporter and asked you a question, but there are comments saying that local risers, hills below the azimuth, and concrete structures are in violation of regulations, what do you think?

[Jung Yunsik]
It seems to be true that there was a difference in the interpretation of the Ministry of Land, Infrastructure and Transport and general experts. At first, I thought that the structure was not a localizer facility, but a pedestal as a ground and underground facility, but I thought that if I systemize it, shouldn't the pedestal be viewed as part of the localizer, and that's why it should be made weak. Now, if it appears as such an obstacle, it has had a significant impact on expanding this accident.

[Anchor]
In addition, some point out that the longitudinal safety zone itself at Muan Airport was shorter than the standard.

[Jung Yunsik]
There is a problem with the definition of terms in the original text. It's the definition of terms for situations and recommendations that must be done. Recommendations are actually not like you can't do it, but if you don't, there must be a reason. If you provide the reason properly, you can get authorization as an international airport. That's why the authorization criteria are like this because the authorities must have understood the right reasons. Now, it's not a matter of understanding or recognition, but we've already made it because we haven't predicted it, in fact, we haven't predicted it. Because something unforeseen happened. It's a case you know now, isn't it? So, I think it's a priority to change to a more secure one even if we invest our budget now in places like Yeosu and Pohang, including Muan Airport.

[Anchor]
It is known that there is no other device mentioned in domestic airports in enhancing safety. There is a device called an aircraft departure prevention device. How much will this add help you in this situation?

[Jung Yunsik]
Since the phenomena of each model are very different, it is applied in small airports or areas with short stepways, but in airports where various models are operated like ours, it is impossible to determine the soft intensity of large aircraft or small aircraft. Sometimes it is necessary to be cautious in applying it because it can be kept constant in places such as Muan and Ulsan where small and medium-sized aircraft are operated.

[Anchor]
Since it's such a big disaster, a lot of people are talking about it overseas. Many foreign media pointed out that it is difficult to understand that there are concrete structures near the runway. Why did they put it up now with concrete?

[Jung Yunsik]
It is a very precise equipment because the antenna must not be shaken by the wind. That's why we need strong support. So this is in some ways what the Ministry of Land, Infrastructure and Transport saw as a support underground. If we install streetlights, isn't there a concrete support underneath the streetlights? In that sense, I interpreted it as not an obstacle or a localizer facility, but the actual phenomenon appears as an obstacle and the actual result also causes that, so I think we are now reviewing new improvements or reexaminations.

[Anchor]
If we look at various reports at the time of the accident, it's unfortunate that the landing gear, or the wheels, did not come down, but the reverse propulsion system or the wings stood like this to help braking, and other braking systems did not work together. How do you analyze this point?

[Jung Yunsik]
If you look at what has been observed in reverse, you come to the conclusion that this is why both engines have not worked. And I don't know if the engine was malfunctioned by actual currents, one accidentally, one accidentally, or another accidentally, or for some other reason, but anyway, when the engine is both malfunctioned, the landing gear system, the flap system, the frass system, the reverse propulsion system, and the air brake system are supposed to happen at the same time. So, experts are now interpreting that both engines are likely to have failed.

[Anchor]
Another concern is that in the event of such an emergency, the remaining oil on the aircraft is discarded to prevent further accidents. But I heard that this accident model does not have such a function.

[Jung Yunsik]
Since it is a small model, there is no system to throw away fuel in the air. The dump system is mainly used when it takes off and becomes a problem, and then it is used when it returns to the takeoff airport. The plane has already flown more than five and a half hours from Bangkok, so the actual remaining time would have been about 30 minutes. So, it is a little unreasonable to say that the fuel itself has increased the anger of this plane. In addition, planes without dump devices consume them while staying in the air. When it's urgent, it's just overlighting the plane in a heavy state and checking the aircraft or runway once again.

[Anchor]
And the black box will play the most important role in identifying it now, but some connectors are problematic, so I don't think I can see the flight recorder data well. There's this story, too. How do you view it?

[Jung Yunsik]
If only the connector is broken, in fact, it is not difficult to reconnect the line to the memory substrate once it is disassembled. So it won't be much damage. That's what I think. If you look at the actual past cases, it won't be a big deal because more damage can be done and enough data can be extracted. That's what I think.

[Anchor]
I see. Let's stop here today. Jeong Yun-sik was a professor of aviation operations at Catholic Kwandong University. Thank you for your comment.