Abstract:

As an important part of Maintenance Review Board Report,the aircraft zonal inspection interval determined by zonal analysis,has great significance for aircraft safe operation. Given the present condition that there are still some nonstandard indexes and imperfections in the zonal rating system,an improved method is proposed in this paper after doing research on international main aircrafts. Firstly,the aircraft zonal influence factors are analyzed and specific rating indexes are established,after which the weight of each index and total ratings are determined by using analytic hierarchy process (AHP)and fuzzy theory. Secondly,ultimate maintenance intervals are obtained by the correspondence of rating and maintenance interval. Finally,this method proves feasible and effective through an example of the thrust reverser cowling.

Key words: aircraft repair, repair interval, zonal check, AHP, fuzzy theory