I've seen the occasional Service Bulletin that is marked Obsolete, and others that Supersede SB-123. If I'm a pilot or A&P looking through logbooks, what resources are available to determine if a given SB still applies to the aircraft?
For example, American SB-131 applies to AA-1, AA-1A, and AA5 aircraft are subject to SBAA-1315 aircraft. However, this scan (pdf) seems to suggest that it's obsolete;obsolete, and the contents are now in the service manual.