Before revision: Some advisory circulars are only a few pages long and do little more than reference a recommended standard; for example, AC 20-115B referencing DO-178B.AC 20-115B , FAA, 1993.
After revision: Some advisory circulars are only a few pages long and do little more than reference a recommended standard; for example, AC 20-152 referencing DO-254.AC 20-152 , FAA,