ANALISIS KEANDALAN FUEL METERING UNIT PADA ENGINE TRENT 700 PESAWAT AIRBUS A330-300 DI PT.GMF AEROASIA

Fuel Metering Unit (FMU) merupakan komponen utama sistem bahan bakar engine Rolls-Royce Trent 700 yang berfungsi mengatur dan mengukur aliran bahan bakar menuju combustion chamber sesuai perintah Engine Electronic Controller (EEC). Selama periode 2023 sampai 2025 tercatat 55 kejadian unscheduled removal FMU P/N 702-03 pada armada Airbus A330-300 di PT GMF AeroAsia, Tbk yang berdampak pada keterlambatan penerbangan dan meningkatnya biaya perawatan. Penelitian ini bertujuan menentukan nilai Mean Time to Failure (MTTF) FMU, mengidentifikasi modus kegagalan yang menjadi prioritas penanganan, serta menyusun usulan perbaikan untuk meningkatkan keandalan komponen. Penelitian menggunakan metode mixed methods. Analisis kuantitatif dilakukan dengan distribusi Weibull dua parameter melalui median rank regression terhadap data Time to Failure (TTF) yang diperoleh dari Time Since Installation komponen, sedangkan analisis kualitatif dilakukan dengan Failure Mode and Effect Analysis (FMEA) berdasarkan kuesioner dan wawancara terhadap empat Aircraft Maintenance Engineer. Hasil penelitian menunjukkan nilai shape parameter (β) sebesar 2,0137 dan scale parameter (η) sebesar 7.400,81 FH dengan koefisien determinasi 0,9748, sehingga FMU berada pada fase wear-out. Nilai MTTF diperoleh sebesar 6.558,02 flight hours dengan reliability tersisa 45,66 persen pada titik tersebut, dan sebanyak 34 unit atau 61,8 persen mengalami kegagalan sebelum mencapai MTTF. Analisis FMEA menempatkan modus kegagalan electrical connector protective broken sebagai prioritas utama dengan Risk Priority Number (RPN) 168, diikuti Housing Adjuster crack (105), HP fuel inlet broken (64), dan Heatshield scratches (48). Berdasarkan konsep B-Life, penelitian ini mengusulkan interval preventive maintenance 2.400 FH (B10 life) untuk mempertahankan keandalan minimum 90 persen, disertai detailed visual inspection konektor beserta protective cover, verifikasi nilai torque backshell, pemeriksaan Non-Destructive Test pada Housing Adjuster, dan leak check setelah pemasangan, sehingga angka unscheduled removal FMU dapat ditekan.

Kata Kunci: Fuel Metering Unit (FMU); Reliability; Rolls-Royce Trent 700; Distribusi Weibull; Mean Time to Failure (MTTF); Failure Mode and Effect Analysis (FMEA); Risk Priority Number (RPN); B-Life.

The Fuel Metering Unit (FMU) is a primary component of the fuel system of the Rolls-Royce Trent 700 engine, which regulates and meters fuel flow to the combustion chamber in accordance with commands from the Engine Electronic Controller (EEC). During the 2023 to 2025 period, 55 unscheduled removals of the FMU P/N 702-03 were recorded on the Airbus A330-300 fleet at PT GMF AeroAsia, Tbk, resulting in flight delays and increased maintenance costs. This study aims to determine the Mean Time to Failure (MTTF) of the FMU, to identify the failure modes that require priority treatment, and to formulate improvement proposals to enhance component reliability. A mixed-methods approach was applied. The quantitative analysis used a two-parameter Weibull distribution estimated through median rank regression of Time to Failure (TTF) data derived from the Time Since Installation of each component, while the qualitative analysis used Failure Mode and Effect Analysis (FMEA) based on questionnaires and interviews with four Aircraft Maintenance Engineers. The results show a shape parameter (β) of 2.0137 and a scale parameter (η) of 7,400.81 FH with a coefficient of determination of 0.9748, indicating that the FMU is in the wear-out phase. The MTTF was found to be 6,558.02 flight hours, at which point the remaining reliability is 45.66 percent, and 34 units or 61.8 percent failed before reaching the MTTF. The FMEA identified electrical connector protective broken as the top priority with a Risk Priority Number (RPN) of 168, followed by Housing Adjuster crack (105), HP fuel inlet broken (64), and Heatshield scratches (48). Based on the B-Life concept, this study proposes a preventive maintenance interval of 2,400 FH (B10 life) to maintain a minimum reliability of 90 percent, combined with detailed visual inspection of the connector and its protective cover, verification of the backshell torque value, Non-Destructive Testing of the Housing Adjuster, and a leak check after installation, so that the rate of unscheduled removals of the FMU can be reduced.

Key Word: Fuel Metering Unit (FMU); Reliability; Rolls-Royce Trent 700; Weibull Distribution; Mean Time to Failure (MTTF); Failure Mode and Effect Analysis (FMEA); Risk Priority Number (RPN); B-Life.