Civil aero-engine repair objective determination based on performance state

To make a scientific and reasonable maintenance workscope of civil aero-engine, an approach for aero-engine repair objective determination which was oriented to the life cycle based on performance state was proposed. The performance deterioration model and the relationship between the performance recovery and maintenance cost were studied. A multi-objective optimization model for repair objective oriented to the life cycle based on performance state was established, and its solution method was put forward. The approach was validated by the actual data from an airline. The results showed that the proposed approach could provide decision support for aero-engine repair objective determination and avoid the randomness of making repair objective. The effectiveness of this approach was also proved.