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During commercial aircraft development, multiple types of models are used to support PHM design or directly as core part of the PHM. The models for PHM development is described in this paper, and the problems of model integration are analyzed. To solve, a flexible integration strategy based on FMI was given for PHM simulation model integration, and a scenario driven decision support system was given for PHM application model integration. The effectiveness of these strategies and methods is demonstrated in practical engineering verification.

Maintainability is always the key to the commercial success of commercial aircraft and directly affects the economy and market competitiveness. The target value of maintainability indexes of each system or equipment of the aircraft shall be determined by aircraft-level maintainability index allocation. MTTR is the most typical parameter that can reflect the maintainability level of aircraft. This paper introduces the weighting factor allocation method based on design characteristics and applies this method to the allocation of MTTR index of commercial aircraft.

Maintenance strategy is developing with the improvement of industrial technology. The application of advanced maintenance strategy is particularly important for high-value products such as commercial aircraft. This paper introduces the classification of maintenance strategies, and describes the application and development of preventive maintenance and condition-based maintenance for commercial aircraft.

During the Large Commercial Aircraft development process through the form of “Manufacturer-Supplier” model, the aircraft design work is allocated to multiple systems and sub-systems down to single equipment and component. This leads to the challenges in the joint design of aircraft PHM system. It is particularly difficult to coordinate between the data and model. Considering the real needs in the optimization of the aircraft PHM system design, this paper describes the establishment of the parameter coupling model between the PHM system and the contributing system (including the sub-system, equipment and components) through the concept of integration. Meanwhile on the basis of the model, the parameter mapping (including parameter identification, demonstration and transfer) among the PHM system and each contributing system, sub-system, equipment and components can be realized through the object-oriented method, so that the effective control of the data collection, transfer, calculation and storage can be achieved. The significant benefit in ensuring sufficient coordination, increasing system design efficiency and quality during the aircraft PHM system joint design is verified in this paper through the investigation of real-world application.