The purpose of this paper is to properly plan the preventive maintenace schedule for maintenance cost consisting of the labor cost,the part cost,and the quality cost(the loss evaluated in terms of cost,to be incurred when an elevator breaks down)is to be minimized.The method is prescheduted of setting up the optimal preventive maintenance schedule on a long-term basis by rescheduling the contents of schedule dynamically and flexibly in accordance with the ever-changing maintenance conditions,taking the possibility of the future occurrence of failure into consideration.From numerical experiments,the ualidity of the proposal procedure for planning the preuentive maintenance schedule and the effectiveness of considering the possibility of the future occurrence of failure in planning the schedule are shown,and the optimal number of maintenance workers can be decided
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