PENANGANAN DAN ANALISIS PENYEBAB LOW QUANTITY HYDRAULIC SYSTEM PESAWAT BOEING 737 – 500 SRIWIJAYA AIR DI HANGGAR PT MERPATI MAINTENANCE FACILITY MENGGUNAKAN METODE FAULT TREE ANALYSIS

AJI RAHMANTO, DANUR (2022) PENANGANAN DAN ANALISIS PENYEBAB LOW QUANTITY HYDRAULIC SYSTEM PESAWAT BOEING 737 – 500 SRIWIJAYA AIR DI HANGGAR PT MERPATI MAINTENANCE FACILITY MENGGUNAKAN METODE FAULT TREE ANALYSIS. Tugas Akhir thesis, Institut Teknologi Dirgantara Adisutjipto.

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Abstract

The Boeing 737-500 aircraft is equipped with a hydraulic system for the operation of the landing gear on both the nose landing gear and the main landing gear. Hydraulic system A system is the main hydraulic system used to perform retraction and nose landing gear extension operations. If there is a leak in one of the components of the hydraulic supply system to the retract actuator, such as the connection of the hydraulic up hose and reducer, the repair should not be delayed, because it can have an impact on decelerating the nose landing gear during retraction if the hydraulic quantity is not as needed. This study aims to analyze the causes of the low quantity hydraulic system and the possible causes of failure of the retraction nose landing gear system B737-500 which had trouble and repairs at the Merpati Maintenance Facility hangar. In this study, the direct observation method was used to analyze the troubleshooting process on the B737-500 at the Merpati Maintenance Facility hangar. In addition, this study also uses the fault tree analysis method to find the cause of failure in the retraction nose landing gear system. The failure of the nose landing gear system retraction on the B737-500 is indicated by the hydraulic quantity display indicator on the reservoir system A which shows the figure of 70%. This figure indicates that the quantity of liquid is below the specified standard, which is 76%. This lack of quantity causes a slowdown in the nose landing gear retraction process. With reference to the Fault Isolation Manual (FIM) B737-500, an initial inspection in the form of a visual check is carried out on the actuator area. Leakage in the hydraulic supply component to the retract actuator nose landing gear causes reduced hydraulic fluid transfer from the reservoir system A to the retract actuator. Replacement of components that cause failure is carried out according to AMM chapter 32-00-00. Followed by analyzing the causes of failures that may occur using FTA, we get 10 basic events that can cause the Top Event (TE) Retraction Nose landing gear to fail.

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