Abstract: It has been first successfully completed on the accelerated corrosion test of the aircraft structure under equivalent environment spectrum,and the calendar effective time of protection coating systems ( y_o) and corrosion propagation rate( v ) of the body are obtained. A set of method and formula for the computation of calendar first D check, calendar time since overhaul and total calendar life is presented by using tests data. It is obtained that the calendar first D check y1=y_o +y_c , calendar time since overhaul y_N =y₁-(y_oy_O ), and the total calendar life Y_T =y_o (1+R+…+R^N)+(N+1)Y_C+NY_S.Using aircraft service corrosion damage date, the computed method of calendar first D check is found. Based on components accelerated corrosion test and statistical data of service corrosion damage, the calendar life for the aircraft of HX type is given out.

Key words: aircraft st ructures, accelerated test, calendar life, comput ing method