zerouali,
They let you spin a PA28-161 with someone in the back seat???
For that matter, they let you spin a PA28-161? Looking at my PA28-161 manual, it isn't even cleared for spins!!!
The Cherokee 140 I owned WAS cleared for spins, but most emphatically, NOT with anyone in the back seat. The aircraft had to be operated in the Utility Category for that.
BeechNut