A model is proposed for economic assessment of projected airplane engines, in terms of life-cycle costs. Adoption of a new strategy is recommended: management of engine life on the basis of the current state of the system (on-condition maintenance) and increase in economic efficiency at the operational stage. A conceptual approach to extending the life of promising aircraft engines is outlined, on the basis of a diagnostic system (real-time performance assessment). That permits decisions regarding the engine’s potential for continued operation.

中文翻译：

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基于状态的飞机发动机经济评估

根据生命周期成本，提出了一个模型，用于对预计的飞机发动机进行经济评估。建议采用新策略：根据系统当前状态（有条件维护）管理发动机寿命并提高运行阶段的经济效率。在诊断系统（实时性能评估）的基础上，概述了一种延长有前途的飞机发动机寿命的概念方法。这允许就发动机继续运行的潜力做出决定。