Jack Allison's discussion of the Hartzell AD for his Arrow has gotten me to thinking.
What aircraft do you fly/have you flown/do you have first hand knowledge of which have a red zone somewhere in the green arc of the tachometer?

There was one aircraft I flew (C172? Arrow?) which had a placard to
avoid operations between (I think) 2000 and 2200, or something like
that. It was not marked as a red zone on the tach though.

Jose
--
He who laughs, lasts.
for Email, make the obvious change in the address.