DO-178C now includes Auxiliary Power Units, whereas DO-178B is not specific about APU. It merely indicated "engines". But what is interesting is that DO-178C qualifies the scope as follows: "... and, by region, Auxiliary Power Units." I am aware that an Indian company has worked on a DO-178B compliant APU Controller for the B787. I therefore wonder what relevance the phrase "by region" has.
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