I think you're dead on TC, and many people have missed this when reading the
ruling. In that particular case it was the overhaul manual that made the
SB's mandatory. There was literally no way to comply with the accepted
overhaul manual without complying with the SB's. The SB's became PART of
the overhaul manual. In all practical purposes "updates" to the manual.

Jim
(waking up each morning to the sounds of PT-6's and R-1340's... summer is
officially here)