6.3. unscheduled maintenance:At any time, use the discovery of the damage if not corrected right quickly reduced the level works, rising costs of maintenance works, serious influence to safety of use, operating the works and has the possibility of catastrophic incidents, must consider to apply the appropriate maintenance levels.The levels of maintenance are applied:-maintenance, maintenance (level 1). -Small fix (level 2). -Fix the medium (level 3).-Major repair (level 4).Note: some of the parts, the structure often occurs damaged are put on items 7, help Home use works have considered the damage detection in order to apply the maintenance level.
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