Fracture analysis of the fan shaft was made by observing macroscopic and microscopic appearances of the crack, and examining micro hardness and chemical composition of the material.

通过观察断裂风机轴裂纹宏观和微观形貌，检验化学成分、显微硬度等方法对风机轴断裂的原因进行了分析。

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On the way out, these gases drive a turbine which is connected to the fan via a shaft, thus drawing in more air and keeping the process going.

在喷管前有一组涡轮，涡轮与风扇连接在一根轴上。涡轮带动风扇又吸入了更多的空气，这样就产生了连续的循环。

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The aircraft’s shaft-driven lift fan propulsion system produced more vertical thrust than needed to meet performance requirements.

经测试，飞机的轴驱动升力风扇推进系统可产生超过性能需求的垂直推力比。

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As for the other incidents that have beset the type over the past few months -- a fan shaft failure on an engine, an oil leak, a windshield crack -- all can safely be put down to teething problems.

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Unlike a conventional turbofan, it uses a gearbox rather than a shaft between the fan and the turbine.

ECONOMIST: Monitor