航空发动机风扇叶片常常因为疲劳裂纹而引起整个结构的损坏，导致重大的安全事故。
The severe safety accidents are induced because the fatigue cracks in fan blade of the aero-engine generally result in the malfunctions of the engine components.
但当时这种发动机噪音太大，同时也担心万一某个风扇叶片折断而划破机身，后果不堪设想。
But the engine was noisy, and there were concerns about what would happen if one of the blades broke off and tore into the aircraft's fuselage.
通用电气表示，他们成功地将发动机重量减轻了3%，约136千克，此举促使波音787世界首次使用合成陶瓷风扇机箱和涡轮叶片。
GE says it has shaved 136kg, or 3%, off the weight of an engine that propels the Boeing 787 using a ceramic-composites fan case and blade, a world first.
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