Maintenance personel manage to Failures and Troubles (F/T) to maintain suitable indoor environment. Time to repair (TTR) of F/T was found to be one of the key performance indicators. It is necessary that future studies develop ways of reducing TTR. We got maintenance records which the maintenance task progress were noted in detail. This study indicates the structure of the maintenance task processes using the maintenance records at a large-scale R&D building in order to shorten TTR. It presents a classified list and a flowchart of maintenance task based on PDCA cycle.
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