螺孔裂纹 bolt hole crack 线路大修 major repair of reack ； overhaul of track ；track renewal 线路中修 intermediate repair of track ..
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Overhaul of the track 线路大修
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Figure 16 shows a flap track that cracked because of hydrogen embrittlement 149 flight cycles after overhaul.
图16示意了襟翼滑轨大修后149个飞行循环内由于氢脆造成裂纹的实例。
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