An aircraft company needs to "secure" their aircraft engine for a good maintenance system to keep the optimum engine's performance during the flight. This paper proposed maintenance analysis and scenario for the CT7, the main engine for aircraft at NTP company. A failure data record from four critical components of the CT7 engine is analyzed using Reliability Centered Maintenance (RCM) and Risk Based Maintenance (RBM) methods to obtain the optimum maintenance interval task for the critical subsystem of the CT7 engine and also seeing the risk of maintenance cost of the engine's failure effect. The RCM analysis result obtained seven scheduled on condition task, six scheduled discard task, and three scheduled restoration task. The interval of the maintenance schedule of each critical component varies according to the function obtained. And based RBM analysis, the risk from system performance loss is got $ 7.014.841, 90. Meanwhile, the total cost of maintenance interval based on a calculation of optimal time interval got $1.885.612, 82.
PT PINDAD adalah salah satu perusahaan BUMN (Badan Usaha Milik Negara) bagian industri manufaktur dalam bidang Alat Utama Sistem Persenjataan (Alutsista) dan produk komersial. Salah satu produk dalam bidang transportasi adalah Air Brake System terdiri dari beberapa assembly, salah satunya assembly Isolating Cock yang terdiri dari Rumah Isolating Cock, Flens, Penutup, dan Baut Ventilasi. Makespan dan batasan waktu penyelesaian order membuat perusahaan berusaha memenuhi pesanan tepat waktu. Usaha yang dilakukan perusahaan adalah menambah shift kerja. Ukuran lot transfer batch yang digunakan mempengaruhi makespan. Makespan yang panjang dikarenakan penyelesaian order menggunakan aturan First Come First Served tanpa memperhatikan ukuran lot transfer batch. Dalam mencapai tujuan minimasi makespan, maka diusulkan penjadwalan dengan algoritma Campbell, Dudek, dan Smith (CDS) dengan ukuran lot transfer batch komponen Rumah Isolating Cock sublot satu 6 unit dan sublot dua 6 unit, komponen Flens sublot satu 9 unit dan sublot dua 3 unit, komponen Penutup sublot satu 4 unit dan sublot dua 8 unit, serta komponen Baut Ventilasi sublot 12 unit, dilakukan lima kali pengulangan sehingga total 60 unit Isolating Cock dapat minimasi makespan dari 117 jam atau 18 shift kerja menjadi adalah 45,8 jam atau 8 shift sehingga menghemat waktu penyelesaian sebesar 60,85%.
An aircraft company needs to "secure" their aircraft engine for a good maintenance system to keep the optimum engine's performance during the flight. This paper proposed maintenance analysis and scenario for the CT7, the main engine for aircraft at NTP company. A failure data record from four critical components of the CT7 engine is analyzed using Reliability Centered Maintenance (RCM) and Risk Based Maintenance (RBM) methods to obtain the optimum maintenance interval task for the critical subsystem of the CT7 engine and also seeing the risk of maintenance cost of the engine's failure effect. The RCM analysis result obtained seven scheduled on condition task, six scheduled discard task, and three scheduled restoration task. The interval of the maintenance schedule of each critical component varies according to the function obtained. And based RBM analysis, the risk from system performance loss is got $ 7.014.841, 90. Meanwhile, the total cost of maintenance interval based on a calculation of optimal time interval got $1.885.612, 82. Keywords— preventive maintenance, reliability-centered maintenance, risk-based maintenance, risk priority number.
As one of railway manufacturing company in Southeast Asia, quality is an important factor in maintaining customer satisfaction and one of the key success in business competition. During the railway production, there is problem in the assembly process of car body sub assembly, namely underframe. Defective products have been found which cause the underframe to be repair, so the underframe production is delayed. The type of defect is porosity, which results from the welding process during the assembly process. Therefore, this study uses the Six Sigma method with the Define-Measure-Analyze-Improve (DMAI) approach to give improvements on welding process so the defect-which is porosity will be reduced or may not exist and to maintain the quality. Define phase using Supplier-Input-Process-Output-Customer (SIPOC) diagram and Critical to Quality (CTQ). Measure phase using c-Chart to know the process stability, then Cp and Sigma Level to know the process capability. Fishbone diagram and Failure Mode Effect Analysis (FMEA) are used in the analyze phase. The result of FMEA is the base to design improvements in the improve phase, the improvements are material storage characteristics, workstation design and procedure display.
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