I don't know the regs. But frankly, I think a flight instructor who's
not current on spins isn't qualified to instruct, whether the regs
require it or not.

Here in Switzerland, flight instructors are required to hold a full
aerobatic rating before they can apply for the instructor rating, and
I've always thought this was reasonable. At least it was so before we
joined JAR, it may have changed now.

BTW: I always read the term CFI (certificated flight instructor). This
rises the question: Is there such a thing as an uncertificated flight
instructor?

Stefan