ANALISIS PENGARUH BLEND-OUT TERHADAP KEKUATAN TARIK PADA AFT CARGO DOOR PESAWAT AIRBUS 330

Pemeliharaan struktur pesawat merupakan aspek krusial dalam menjaga keselamatan dan keandalan operasional, khususnya pada komponen aft cargo door pesawat Airbus 330 yang berperan mempertahankan integritas Fuselage dan tekanan kabin. Dalam praktik maintenance, kerusakan seperti dent, scratch, dan chafing sering ditemukan dan berpotensi menurunkan kekuatan struktural material Aluminium Alloy 2024-T3, sehingga diperlukan metode perbaikan yang sesuai dengan batasan kerusakan (damage limit) pada Structural Repair Manual (SRM). Penelitian ini bertujuan menganalisis pengaruh repair blend-out terhadap kekuatan tarik (tensile strength) struktur aft cargo door. Metode yang digunakan adalah kuantitatif eksperimental melalui pengujian tarik (tensile test) berdasarkan standar ASTM E8/E8M pada dua kondisi spesimen, yaitu tanpa repair (initial thickness) dan setelah repair blend-out sedalam 0,25 mm (kategori repair B sesuai SRM), dilanjutkan dengan uji statistik Independent Samples T-Test. Hasil pengujian menunjukkan spesimen initial thickness memiliki rata-rata Ultimate Tensile strength (UTS) 482,72 MPa, yield strength 344,84 MPa, dan elongation 17,92%, sedangkan spesimen repair blend-out menghasilkan rata-rata UTS 440,64 MPa, yield strength 311,42 MPa, dan elongation 14,68%. Uji statistik menunjukkan perbedaan yang signifikan (p<0,05) pada seluruh parameter, dengan penurunan tensile strength sebesar 8,72%, yield strength 9,69%, dan elongation 18,08% akibat berkurangnya luas penampang efektif material. Meskipun demikian, kedalaman blend-out pada penelitian ini masih berada dalam batas allowable SRM kategori B, sehingga metode repair blend-out tetap dinyatakan valid dan efektif untuk diterapkan pada aft cargo door, dengan catatan penurunan kekuatan tarik perlu diperhitungkan dalam analisis structural safety margin sesuai prosedur airworthiness yang berlaku, guna mendukung kegiatan Maintenance, Repair, and Overhaul (MRO) khususnya di GMF AeroAsia.

Aircraft structural maintenance is a crucial aspect in ensuring operational safety and reliability, particularly in the aft cargo door component of the Airbus A330, which plays an important role in maintaining Fuselage integrity and cabin pressurization. In maintenance practices, defects such as dent, scratch, and chafing are frequently found and may reduce the structural strength of Aluminium Alloy 2024-T3, requiring an appropriate repair method in accordance with the damage limits specified in the Structural Repair Manual (SRM). This study aims to analyze the effect of repair blend-out on the tensile strength of the aft cargo door structure. The research employs a quantitative experimental method through tensile testing based on the ASTM E8/E8M standard on two spesimen conditions, namely without repair (initial thickness) and after repair blend-out at a depth of 0.25 mm (repair category B per SRM), followed by an Independent Samples T-Test. The results show that the initial thickness spesimens produced an average Ultimate Tensile strength (UTS) of 482.72 MPa, yield strength of 344.84 MPa, and elongation of 17.92%, while the repair blend-out spesimens produced an average UTS of 440.64 MPa, yield strength of 311.42 MPa, and elongation of 14.68%. Statistical testing revealed a significant difference (p<0.05) across all parameters, with reductions of 8.72% in tensile strength, 9.69% in yield strength, and 18.08% in elongation, attributed to the reduced effective cross-sectional area of the material. Nevertheless, the blend-out depth in this study remains within the allowable limit of SRM category B, indicating that the repair blend-out method remains valid and effective for application on the aft cargo door, provided that the resulting reduction in tensile strength is accounted for in the structural safety margin analysis in accordance with applicable airworthiness procedures, thereby supporting Maintenance, Repair, and Overhaul (MRO) activities, particularly at GMF AeroAsia..