Actually, AMA phased in the turnaround concept. In the mid-80's only FAI was turnaround - AMA was still the single maneuver per pass. From 1984-86 AMA allowed one to enter the standard AMA class as well as the FAI (turnaround) class. I had several years when I could fly two classes per contest (I flew Masters and FAI). That was fun! You got to fly twice as much as those in the other classes. Eventually, turnaround style maneuvers were put into the lower classes.

Jeff