Interestingly, it looks like the A350 software probably was developed under DO-178B[1] rather than DO-178C[2] given the timing of release. This may seem minor,

Interestingly, it looks like the A350 software probably was developed under DO-178B[1] rather than DO-178C[2] given the timing of release. This may seem minor, but Wikipedia's comparison indicates 178B was looser. Of course, these specs just consider requirements, not so much advice on implementation. [1]https://en.wikipedia.org/wiki/DO-178B https://en.wikipedia.org/wiki/DO-178B [2]https://en.wikipedia.org/wiki/DO-178C https://en.wikipedia.org/wiki/DO-178C