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Development and verification of systems for internal aircraft networks include multiple software layers. These layers are mainly the application-specific components, communication layers, redundancy management and other system services. Verification of these system layers in the early stages of the design process, before a physical network is available, and during the design process has become a critical need in order to reduce design costs and project risks. Time-Triggered Architectures (TTA) and SCADE are both well-established technologies and tools for building safety-critical embedded systems. Both are based on the synchronous paradigm; TTA for the communication infrastructure and distributed embedded computing, and SCADE for simulating and generating code for the application components.

In this paper, we will describe how synchronous methods form the scientific basis for the creation of a correct-by-construction methodology required for safety-critical embedded systems. We will show how they are applied to software design, validation, and implementation through a process of high-level rigorous specifications, from which we can create correct-by-construction embeddable implementation. The synchronous methods we know today have more than 20 years of scientific research plus ten years of successful industrial application. This paper will explore the basic conceptual model of embedded computation supported by three underlying prerequisites: high-level rigorous graphical and textual languages, compiling algorithms for correct-by-construction implementation, and formal testing and verification techniques.