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The possibility of making a model and the result of the experiment is judged to be low
To conclude by further investigation of the crew.
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The Special Investigation Committee on Social Disasters (Secretary Committee) announced the results of an intermediate experiment indicating that it is unlikely that the rudder control device ‘solenoid valve (hydraulic regulator) will jam (breakdown)’, which was noted as one of the causes of the Sewol ferry sinking is probably not related to the accident. .
On the 26th, the Sachaum Committee announced the intermediate results of a model test to verify the cause of the sudden change on the Sewol ferry at Mokpo New Port, Jeollanam-do, where the ship’s hull was enshrined.
Meanwhile, the SAC has been investigating the cause of the sudden turn, the cause of the side slope (the boat is leaning to the current side) and the cause of the rapid flood to determine the cause of the disaster. The solenoid valve is part of a device that moves the rudder of a ship, and it has been suggested that the binding of this valve is the cause of the sudden turn of the ferry Sewol to starboard. Previously, three of the six members of the Sewol Hull Investigation Committee argued that the solenoid valve blockage was the cause of the starboard turn.
As a result of verifying a steering system model similar to that of the Sewol ferry, the Sajeong committee revealed that valve sticking is unlikely to be related to sinking.
When the test is done under the premise that the valve is stuck, there are two cases where the starboard turn of the rudder returns to the maximum starboard angle (35 degrees) and then returns to port at 8 degrees like the Sewol ferry.
The first is a case where the ship’s hull turns to starboard due to valve failure, and then the crew stops the driving device for Incheon and operates the flight to Jeju, so that the helmsman governs the port to 8 degrees. However, in the case of this family, it was considered unlikely because the sailors at the time denied that they did not perform an emergency act that triggered the trip to Jeju.
The second is the case where the helmsman himself played starboard, and it can happen even if there are no failures such as stuck valves, according to the Chiefs of Staff.
However, there were some opinions that the first condition is likely to be met. This is because the crews constantly claim that there was no steering action that changed the starboard angle, and in the breeding experiment, if the solenoid valve stuck during normal steering, the starboard angle change phenomenon was played repeatedly.
In light of these views, the Committee will further investigate the timing of the solenoid valve stuck, whether the crew has been deliberate or negligent, and whether there has been any emergency action.
/ Reporter Han Dong-hoon [email protected]
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