TROUBLESHOOTING DEPLOY FAULT-SLEEVE LOCK SENSOR PADA PESAWAT BOEING 737-900 ER ENGINE CFM56-7B

Wibowo, Lintang (2022) TROUBLESHOOTING DEPLOY FAULT-SLEEVE LOCK SENSOR PADA PESAWAT BOEING 737-900 ER ENGINE CFM56-7B. Tugas Akhir thesis, Institut Teknologi Dirgantara Adisutjipto.

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Abstract

Every transportation must have a braking system that is useful for stopping or slowing down the transportation. Thrust reverser is one of the components used for aircraft braking purposes when landing on the runway which can reverse the direction of the engine thrust to the front of the aircraft. There are reports of the thrust reverser on the Boeing 737-900 ER having failed to deploy one of the thrust reversers which could interfere with the landing process. The method used in this study is an external check on several components related to the problematic system. External checks are in the form of detailed visual inspections that are used to determine whether a component has a problem or not when one of the crew tries to operate the problematic component and the other crew sees directly the cause of the failure of the system not working. After troubleshooting the thrust reverser, it was found that the seal inside the Upper Locking Hydraulic Actuator (ULHA) was damaged. The main factor causing damage is fatigue in the seal. Fatigue is caused by the use of components that exceed the required flight hours and are not immediately replaced with new components. Excessive use is the cause of damaged components and must be replaced with new components.

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