SAE Aerospace Information Report 6110, "Contiguous Aircraft/System Development Process Example," follows the development of a complex wheel brake system (WBS) using processes in the industry standards Arp4754A, "Guidelines for Development of Civil Aircraft and Systems," and Arp4761, "Guidelines and Methods for Conducting the Safety Assessment Process on Civil Airborne Systems and Equipment."Air6110 employs informal methods to examine several WBS architectures which meet the same requirements with different degrees of reliability.In this case study, we analyze the Air6110 with formal methods. First, WBS architectures in Air6110 formerly using informal steps are recreated in a formal manner. Second, methods to automatically analyze and compare the behaviors of various architectures with additional, complementary information not included in the Air6110 are presented. Third, we provide an assessment of distinct formal methods ranging from contract-based design, to model checking, to model based safety analysis.

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Model Driven Engineering practitioners already bene¦t from many well established veri¦cation tools, for Object Constraint Language (OCL), for instance. Recently, constraint satisfaction techniques have been brought to Model-Driven Engineering (MDE) and have shown promising results on model veri¦cation tasks. With all these tools, it becomes possible to provide users with formal support from early model design phases to model instantiation phases. In this paper, a selection of such tools and methods is presented, and an attempt is made to de¦ne a veri¦cation and validation process for model design and instance creation centered on UML (Uni¦ed Modeling Language) class diagrams and declarative constraints, and involving the selected tools. The suggested process is illustrated with a simple example.

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