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Maintenance Philosophy is the mix of strategies that ensure an item works as expected when needed. ==Definition== Maintenance is a form of risk management that is required if and only if an item fails to satisfy the minimum level of specification performance when the items or system is required. Maintenance is optional and may not be required if the partially failed item still satisfies the minimum level of specification performance or if the item is not required for a span of time. Maintenance takes place in four phases. * Failure Detection * Fault isolation * Corrective action * Operational verification An item is said to be degraded when faults exist but normal operation can continue. Automatic recovery is used to avoid the need for maintenance. Automatic recovery from failure is required for systems and resources that cannot be accessed during deployment, such as rockets, missiles, satellites, submersibles, and items that are buried or encapsulated. There are multiple approaches. * Custom items designed specifically for ultra high reliability * Redundant items with reconfiguration features that automatically bypass failure * Lot testing to reduce manufacturing defects Redundant items increase failure rate and reduce reliability if recovery is not automatic. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Maintenance philosophy」の詳細全文を読む スポンサード リンク
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