B737C525,
Thank you for that information, which was as I suspected.
During some searching, I stumbled on this interesting video of spin-testing a Beech Duchess:
As pointed out in the video, even after successful spin-testing during certification test-flying, the Duchess was certified in the Normal Category and placarded "Normal Category Aircraft: No acrobatic maneuvers, including spins, approved."
Previously discussed on PPRuNe here:
http://www.pprune.org/flight-testing...ml#post8778999