Safety Assessment hydraulic system Aircraft H-8AbstrakSistem hidrolik termasuk secondary power yang digunakan untuk menggerakkan bidang atur kendali terbang, mengeluarkan dan melipat roda pendarat, dan memberikan tenaga pengereman ketika pesawat di darat. Kegagalan sistem hidrolik dapat menyebabkan pesawat hilang kendali sehingga memungkinkan pesawat mengalami kecelakaan dan jatuhnya korban jiwa. Penelitian ini membahas tentang penilaian keselamatan sistem hidrolik pesawat terbang H-8 yang mencakup proses penilaian keselamatan, regulasi mengenai sistem hidrolik pesawat terbang, beban-beban yang harus ditanggung oleh sistem hidrolik, dan prestasi sistem hidrolik pesawat H-8. Penilaian keselamatan dimulai dari melakukan identifikasi fungsi, kondisi kegagalan, efek kegagalan, dan mengklasifikasikan kondisi kegagalan dari sistem hidrolik tersebut.Kata kunci : System Safety Assessment (SSA), sistem hidrolik, Fault Tree Analysis (FTA), Markov Analysis (MA), Fanctional Hazard Asessment (FHA). Abstract A hydraulic system is one of the secondary power used to drive the flight control surfaces, retract and extend landing gears, and to provide power to wheel brakes when the aircraft is on the ground. The failure of the hydraulic system results in aircraft lost of control which can lead to aircraft accident and passenger deaths. This journals discusses the safety assessment of the hydraulic system to be used in H-8 aircraft which includes the safety assessment process, regulations of the aircraft hydraulic system, the hydraulic system loads, and the aircraft hydraulic systems performance. The safety assessment begins with identification and classification of the functions, failure conditions, the effects of failure, and classify the failure conditions of the hydraulic system.