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DO-248

DO-248C, Supporting Information for DO-178C and DO-278A, published by RTCA, Incorporated, is a collection of Frequently Asked Questions and Discussion Papers addressing applications of DO-178C and DO-278A in the safety assurance of software for aircraft and software for CNS/ATM systems, respectively. Like DO-178C and DO-278A, it is a joint RTCA undertaking with EUROCAE and the document is also published as ED-94C, Supporting Information for ED-12C and ED-109A. The publication does not provide any guidance additional to DO-178C or DO-278A; rather, it only provides clarification for the guidance established in those standards. The present revision is also expanded to include the "Rationale for DO-178C/DO-278A" section to document items that were considered when developing DO-178B and then DO-178C, DO-278A, and DO-330, as well as the supplements that accompany those publications.

Outline of contents
DO-248C contains the following: • Rationale for each process objective of DO-178C/DO-278A • 84 frequently asked questions (some noted as either deleted, removed or addressed by other publications) • 21 discussion papers: :#Verification Tool Selection Considerations :#The Relationship of DO-178B/ED-12B to the Code of Federal Regulations (CFRs) and Joint Aviation Requirements (JARs) :#The Differences Between DO-178A and DO-178B Guidance for Meeting the Objective of Structural Coverage :#Service History Use—Rationale for DO-178C :#Application of Potential Alternative Methods Compliance for Previously Developed Software (PDS) :#Transition Criteria :#Definition of Commonly Used Verification Terms :#Structural Coverage and Safety Objectives :#Certification With Known Software Problems :#Considerations Addressed When Deciding to Use Previously Developed Software (PDS) :#Qualification of a Tool Using Service History (Removed, see DO-330) :#Object Code to Source Code Traceability Issues :#Definitions of Statement Coverage, Decision Coverage, and Modified Condition/Decision Coverage (MC/DC) :#Partitioning Aspects in DO-178C/DO-278A :#Relationship Between Regression Testing and Hardware Changes :#Cache Management :#Usage of Floating-Point Arithmetic :#Service Experience Rationale for DO-278A :#Independence in DO-178C/DO-278A :#Parameter Data Items and Adaptation Data Items :#Clarification on Single Event Upset (SEU) as It Relates to Software == References ==
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