在分析基准使用条件下飞机结构寿命包线的基础上，给出飞机结构在非基准使用条件下的寿命包线的绘制方法，阐明了在非基准使用条件下对飞机结构进行单机寿命监控的原理与方法。最后以飞机首翻后进行第二次大修的大修间隔期监控为例进行了分析说明。

Based on the analysis of the aircraft structural life envelope (ASLE) under the baseline operational conditions, an approach of establishment of aircraft structural life envelope (ASLE) under nonbaseline operational conditions is presented. The method of service life supervision for individual aircraft structural system(SLSFIASS) under nonbaseline operational conditions is given. Taking the supervision of the time between the first and second overhauls for an aircraft structural system for example, the supervising methods and steps of SLSFIASS are demonstrated.