Originally Posted by
rickair7777
But I don't think the FAA could enforce this until they get the word out...they need to do a new AC and of course get their flight standards people on board.
I think you're right about that.
In fact there was an enforcement action brought against an instructor a few years ago involving this issue. From correspondence with the CFI involved, it's my understanding that it was dropped in part because of the conflict in the publicly available FAA documents on the subject.