Research On Determination Of Zonal Inspection Intervals For Civil Aircraft

Maintenance is very important for civil aircraft regarding project management and operation. Scientific and effective maintenance is able to ensure the level of safety and reliability for aircraft. The maintenance program is an essential reference for directing the work of maintenance. It can benefit the process of formulating tasks as well as saving costs,and is one of the fundamental documents ensuring continuing aircraft airworthiness.One of the most important things in formulating aircraft maintenance program is to determine the zonal inspection intervals. The process of Zonal Analysis is composed of standard zonal analysis and enhanced zonal analysis process. Since the latter always touches upon stuffs like wire, combustible materials and EWIS components, it's more complicated to conduct concrete and logical analysis. In accordance with current situation that there has no perfect rating system of zonal inspection under MSG-3 analysis system, this study focuses on enhanced zonal analysis process and inspection intervals determination based on improved fuzzy analytic hierarchy process(FAHP).This article analyzes the impact of enhanced zonal rating factors, establishes a hierarchical index evaluation system and then utilizes the improved fuzzy analytic hierarchy process(FAHP) to determine the indexes' weight. Moreover, the zonal inspection intervals can be established according to the correspondence between rates and intervals. Finally,simplify the operation of the model by applying Mathematica Programming, and take a typical zone of an aircraft as an example to verify the method.