日本防卫省因川崎重工业伪造为海上自卫队1988年至2021年建造的潜艇发动机燃油效率数据，将其项目投标资格暂停2.5个月。该问题影响海自24艘潜艇中的23艘发动机，但官员表示不会对安全或性能构成风险。
日本防卫省于2025年12月27日宣布，自即日起至3月11日，对川崎重工业（KHI）暂停项目投标资格2.5个月。该决定源于该公司伪造1988年至2021年间供应给海上自卫队（MSDF）的潜艇发动机燃油效率数据。
据防卫省称，KHI篡改了组装发动机测试数据以满足合同要求。海自全部24艘潜艇均由KHI发动机提供，其中23艘受影响——不包括最近交付的舰艇。尽管存在违规，但防卫省保证潜艇安全和作战性能未受影响。
该丑闻在更广泛审查中浮出水面。2024年8月，发现私营部门船舶发动机存在类似数据伪造，促使防卫省检查兵库县神户工厂。此前，2024年6月，外部律师小组发现海自发动机潜在问题，KHI于同年8月主动向防卫省报告。此合作导致暂停期缩短。
作为主要国防承包商，KHI的行为引发了对日本军事建设采购诚信的质疑。防卫省计划实施更严格监督以防重演。
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