Maintenance actions have an important role in maintaining product availability, reliability, and quality in the production process. Strategies for carrying out maintenance actions have evolved over time, and technological advances and research are developingrapidly. Matter It aims to build a more efficient and reliable system. Equipment performance that continues to decrease over time without effective maintenance falls into the extreme damage category. Increasing age and use cause a decrease in the function of the equipment. To assess reduction due to age and reduction due to use, this study employs a hybrid hazard rate. Maintenance is carried out when the equipment reaches a predetermined reliability threshold. After several uses, the preventive system will be replaced. Until now, there has been no research to determine maintenance actions that optimize availability with a specified reliability threshold. This research will try to model a maintenance policy strategy that optimizes availability with predetermined threshold values. The goal is that the owner can evaluate the performance of the equipment so as to avoid the risk of loss of equipment availability due to maintenance actions. At the end, a numerical experiment is given to illustrate the implementation of the proposed model.

Keywords: Maintenance, Availability, imperfect PM. Threshold, Reliability