CAST-31
CAST-31, Technical Clarifications Identified for RTCA DO-254 / EUROCAE ED-80 is a Certification Authorities Software Team (CAST) Position Paper. It is an FAA publication that "does not constitute official policy or guidance from any of the authorities", but is provided for educational and informational purposes only for applicants for software and hardware certification. Contents. DO-254/ED-80 was introduced in 2000, but, unlike DO-178C, has not been updated to address concerns coming from decades of experience with applying the guidance of the standard; including errors, omissions, and advances in technology. This CAST Position Paper was created as both needed interim clarifications  and a starting point for eventual development and release of an updated DO-254/ED-80. Concerns identified in the Position Paper include: Where this Position Paper identifies an omission or need for clarification in DO-254, it generally identifies a section within either FAA Order 8110.105 or EASA CM-SWCEH-001 where the issue is discussed. While DO-254/ED-80 has not been updated, this Position Paper is no longer provided on the FAA website because the "model for certification authority harmonization has changed since CAST's inception and now includes direct collaboration with industry on technical topics."