<![CDATA[The issue of frequent failures in the gas expander machine at PT XYZ has resulted in significant downtime, disrupting the production process of ammonium nitrate. This study aims to provide preventive maintenance recommendations using the Mean Time Between Failure (MTBF) and Mean Time to Repair (MTTR) methods. The research was conducted over a one-month period, from January 2 to February 2, 2025, using data collection techniques such as interviews and company document analysis. The data analyzed included machine operating hours and breakdown frequency from 2019 to 2023. The calculation results showed an MTBF value of 2,158.67 hours and an MTTR value of 32 hours. The MTBF indicates that failures occur on average every 90 operating days, while the MTTR indicates that the average repair time is 1.33 days. Based on these findings, it is recommended to perform preventive maintenance every three months. This study concludes that implementing a maintenance strategy based on MTBF and MTTR can minimize unexpected breakdowns, improve machine reliability, and support the sustainability of production processes in the explosives industry. Keywords: Gas Expander, MTBF, MTTR, Preventive Maintenance]]>
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