AC 61-27C superceded by FAA-H-8083-15.
Thanks for the pointer.
However, AC 61-27C (1980) has been superceded by FAA-H-8083-15 (2001). Apparently they completely rewrote it...and, for what its worth, it's apparently no longer an advisory circular.
In any event, that's the one I'm trying to find online.
Thanks,
...Dave