Are issues that are discovered on structural components required to be reported during maintenance checks? What happens if, say, during a D check it is discovered that there is a crack in a structural component emanating from a rivet hole. Is the crack required to be reported to the manufacturer or even the civil authorities so that other aircraft can be checked for similar problems and, if necessary, the component or drilling/manufacturing technique modified upstream and an AD issued downstream?
I would assume there is more interest in reporting these types of issues on newer models that come up for the first D Checks (e.g., A380), but what about old dogs, like a 744, that have had many D checks performed on the worldwide fleet? If a crack is found in a structural component for an existing model, and there is no obvious reason for the crack other than it emanates from a drill hole (which would indicate improper drilling or deburring), is anything else done besides repairing it and recording the repair in the aircraft's maintenance logs?