Integrated Modular Avionics
IMASection 11: Aircraft & Avionics Architecture
Definition
An avionics system architecture in which multiple aircraft functions of potentially different criticality levels are hosted on shared computing hardware (processors, memory, I/O modules, network switches) within a common cabinet or platform. IMA relies on robust partitioning mechanisms to ensure that functions are isolated from each other in time and space, preventing a fault in one hosted application from affecting other applications sharing the same hardware.
Where This Shows Up
IMA emerged as a response to the weight, power, and cost penalties of federated architectures. The concept was first implemented on the Boeing 777 (AIMS cabinet) and has since been adopted on the A380, B787, A350, and other modern aircraft. IMA platforms typically use ARINC 653 for software partitioning, ARINC 664 Part 7 (AFDX) for deterministic networking, and standardized module form factors (e.g., ARINC 653-compliant computing modules). Certification of IMA is more complex than federated systems because the partitioning mechanisms must be demonstrated to provide equivalent isolation to physical separation, and the platform must be certified to host applications up to the highest DAL required by any hosted function.
Primary Sources
Integrated Modular Avionics (IMA) Development Guidance and Certification Considerations — the primary guidance document for IMA development and certification.
Guidelines for Development of Civil Aircraft and Systems — addresses IMA in the context of system-level development assurance.
Artifacts Produced
Document defining the certification approach for the IMA platform, including partitioning demonstration, reusable module certification, and hosted application integration.
Related Terms
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