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Operational availability in systems engineering is a measurement of how long a system has been available to use when compared with how long it should have been available to be used. ==Definition== Operational availability is a management concept that evaluates the following.〔(【引用サイトリンク】title=Opnav Instruction 4790.7: Maintenance Policy for United States Navy Ships )〕 * Diagnostic down time * Criticality * Fault isolation down time * Logistics delay down time * Corrective maintenance down time Any failed item that is not corrected will induce operational failure. is used to evaluate that risk. Operational failure is unacceptable in any situation where the following can occur. * Capital equipment loss * Injury or loss of life * Sustained failure to accomplish mission 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「operational availability」の詳細全文を読む スポンサード リンク
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