This document discusses maintenance engineering. It defines maintenance as processes that keep equipment functioning normally to deliver expected performance without breakdowns. Maintenance aims to reduce business risks and maximize asset life at optimal cost. It involves basic functions like repairing, overhauling, and inspecting equipment, as well as composite functions like protecting facilities, reducing downtime, and analyzing repetitive failures. Maintenance objectives center around maintaining high equipment efficiency, minimizing deterioration costs, and helping management with replacement decisions. Responsibilities include caring for equipment availability and maintainability, identifying chronic problems, and implementing effective preventative programs. Benefits of maintenance include lower costs, extended asset life, reduced risks, and improved safety.