Before revision: Revision History History of AC 20-115 Revision Year SummaryAC 20-115A 1985 Called attention to RTCA DO-178A.AC 20-115B 1993 Called attention to RTCA DO-178B.AC 20-115B, FAA, 1993.
After revision: Revision History History of AC 20-115 Revision Year SummaryAC 20-115A 198620-115 1982 Called attention to RTCA DO-178.AC Called attention to RTCA DO-178A.AC 20-115B 1993 Called attention to RTCA DO-178B.AC 20-115B, FAA, 1993.