EUROCAE ED-109 PDF

This guidance applies to software contained in CNS/ATM systems used in ground or space-based applications shown by a system safety assessment process to affect the safety of aircraft occupants or airframe in its operational environment. The assurance of software resident within the airframe boundaries, including CNS/ATM-related equipment, is addressed by ED-12B/DO-178B.

A description of the safety assessment process is not included in this document. Information on such assessments is available from other industry sources and in related regulatory guidance. Likewise, a complete description of the system life cycle processes, including system validation, as well as CNS/ATM systems approval, is not intended. This guidance is not intended to be a development standard nor a process document.

It should be noted that additional objectives and evidence may be needed for certain elements of CNS/ATM systems for reasons that are beyond the scope of this document (e.g., additional requirements due to the difficulty in servicing satellite systems).

PURPOSE

This document provides guidelines for the assurance of software contained in non-airborne CNS/ATM systems. ED-12B/DO-178B, Software Considerations in Airborne Systems and Equipment Certification, defines a set of objectives that are recommended to establish assurance that airborne software has the integrity needed for use in a safety-related application. These objectives have been reviewed, and in some cases, modified for application to non-airborne CNS/ATM systems. This document is intended to be an interpretive guide for the application of ED-12B/DO-178B guidance to non-airborne CNS/ATM systems.