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LAPAN: Weather Not Causing the Fall of Lion Air JT 610
10 Nov 2018 • Read : 952 x ,

According to the National Aeronautics and Space Agency (LAPAN), weather is not the cause of the fall of Lion Air JT 610. The aircraft disaster research team from LAPAN's Center for Atmospheric Science and Technology examined three possible factors.

Research team member Erma Yulihastin said the research question was related to atmospheric conditions with the incident. Plane registration of PK-LQP type Boeing 737 MAX 8 flight Lion Air JT-610 Jakarta-Pangkalpinang route departs Monday, October 29 2018 at 6:10 WIB from Soekarno-Hatta Airport. The plane carrying 189 passengers crashed a few minutes later in the waters of Tanjung Karawang, West Java.

The team processed data from several equipment, observations, including confirmation of atmospheric model data from Sadewa (Satellite-bassed Disaster Early Warning System), and conducted special experiments with a resolution of 1 kilometer. The goal is that the team can see more detailed conditions around the location. "We are trying to detect three phenomena that usually interfere with the aircraft, causing accidents," he told Tempo, Friday, November 9, 2018.

The first phenomenon is related to downburst, or downward wind blows which cause very strong wind deviations. "It was as if the plane had been knocked down by the wind from above. From the team's study, the potential of the downburst was small because there was no wind that was too strong in the location of the plane. The wind at that time at an altitude of 1.5 to 2 kilometers tends to be calm and the speed is small. "About 2 meters per second at the time of the incident around 6 am."

The second possibility is the clear air turbulence phenomenon. "Severe turbulence can occur in areas without clouds," Erma said. By visibility there are no clouds also detected by clouds by aircraft radar. But there is a very severe turbulence that is very dangerous for flight.

The team tried to see that potential by calculating the index. The acquisition of the calculation based on the model is 20 or very high. "While if there is clear air turbulence (CAT) it must be less than 0.25. In other words, there is no potential for CAT, "he said.

Then the third team wanted to see the occurrence of microburst which is characterized by very fast growth of cumulonimbus clouds. Cloud growth indicates unstable atmospheric conditions. "Our data concludes that there is no cloud growth phenomenon."

Cloud growth is known at 02.00 - 04.00 WIB. The team uses very high resolution data from the Himawari satellite which specifically monitors clouds. "Five hours of cloud decay, six o'clock is relatively clean from the cloud," he said.

The microburst phenomenon almost does not occur. The side of atmospheric stability is also checked with several parameters, the results do not show any air upward movement which means there is no cloud growth. "We also detected the possibility of bad weather such as the thunderstorm also not being there," said Erma.

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