FAA AC 20-115 : 2013

1. Purpose of this Advisory Circular (AC)
2. Applicability
3. Cancellation
4. Background
5. Using ED-12B/DO-178B Processes and Procedures
    for New Development
6. Using EUROCAE ED-12C and RTCA DO-178C
7. Reserved
8. Guidance applicable to ED-12B/DO-178B or
    ED-12C/DO-178C
9. Modifying and Re-using Software Approved using
    ED-12/DO-178, ED-12A/DO-178A, or ED-12B/DO-178B
10. Tool Qualification
11. Related Regulatory, Advisory, and Industry Material
12. Where to Find this AC
Appendix A - Advisory Circular Feedback Information

Defines an acceptable means, but not the only means, for showing compliance with the applicable airworthiness regulations for the software aspects of airborne systems and equipment in type certification or TSO authorization.