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The flexible nature of DO-178C's processes and entry/exit criteria make it difficult to implement the first time, because these aspects are abstract and there is no "base set" of activities from which to work. The intention of DO-178C was not to be prescriptive. There are many possible and acceptable ways for a real project to define these aspects.
DO-178C and DO-254 define the design assurance objectives that must be accomplished for given DAL. Unlike SIL, it is the case that both ASIL and DAL are statements measuring degree of hazard. DAL E is the ARP4754 equivalent of QM; in both classifications hazards are negligible and safety management is not required.
DO-178B, Software Considerations in Airborne Systems and Equipment Certification is a guideline dealing with the safety of safety-critical software used in certain airborne systems. It was jointly developed by the safety-critical working group RTCA SC-167 of the Radio Technical Commission for Aeronautics (RTCA) and WG-12 of the European ...
For example, assignment of the number of days in a month (excluding leap years) could be achieved by using either a switch statement or by using a table with an enumeration value as an index. The number of tests required based on the source code could be considerably different depending upon the coverage required, although semantically we would ...
Software failure rates cannot be predicted with any confidence. Although significant research in the field of software reliability has been conducted (see for example Lyu (1996), [12] current software safety standards do not require any of these methods to be used or even discourage their usage, e.g. DO178C [4] (p. 73) states: “Many methods ...
ARP4754 is intended to be used in conjunction with the safety assessment process defined in SAE ARP4761 (updated to Revision A in December 2023) and is supported by other aviation standards such as RTCA DO-178C/DO-178B and DO-254. This guideline addresses Functional Safety and design assurance processes.
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For the electronics that provide communication and control of the systems, this means a move towards compliance with DO-178C and DO-254 for software and hardware development. [4] In most cases, unmanned aircraft (UA) can only be operated as part of a system, hence the term “unmanned aircraft system” (UAS).