This study conducts a practical application of shipboard operation human reliability analysis (SOHRA) to a crankshaft overhauling operation of a general cargo ship at dry-docking period. The SOHRA approach includes error producing condition (EPC) and general task type (GTT) parameters to consistently calculate the human error probability (HEP) values of operation steps. In this case, a comprehensive overhauling of main engine was planned at shipyard since the ship has experienced a catastrophic failure. An onboard survey to ship engine room is conducted to monitor the operational conditions. The targeted operation, involves disassembly, maintenance, and reassembly stages, is monitored based on 39 sub-tasks. According to the initial findings, immediate recovery actions are suggested to eliminate critical safety issues in a timely manner. Moreover, an extended discussion through long-term safety recommendations are also provided. The results revealed from case study illustrates that HEP values in maintenance operations are sensitive to ship operating conditions. The proposed approach is found very useful by company executives to support ship technical superintendents in critical operation monitoring. The further study is considered to develop mobile application of SOHRA specific to maintenance operations onboard ships.

中文翻译：

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某杂货船干入坞曲轴大修人员可靠性分析

本研究将船上操作人为可靠性分析（SOHRA）实际应用于干坞期杂货船曲轴大修作业。SOHRA 方法包括错误产生条件 (EPC) 和通用任务类型 (GTT) 参数，以一致地计算操作步骤的人为错误概率 (HEP) 值。在这种情况下，由于该船发生了灾难性故障，船厂计划对主机进行全面检修。对船舶机舱进行船上检验以监测操作条件。目标操作包括拆卸、维护和重新组装阶段，基于 39 个子任务进行监控。根据初步调查结果，建议立即采取恢复行动，及时消除关键安全问题。而且，还提供了通过长期安全建议进行的扩展讨论。案例研究揭示的结果表明，维护操作中的 HEP 值对船舶操作条件很敏感。公司高管发现所提议的方法对于支持船舶技术主管进行关键操作监控非常有用。进一步的研究被认为是开发 SOHRA 特定于船上维护操作的移动应用程序。