Bell 412 Tail Rotor Manual Rotation
Recently I've observed a mechanic manually spinning the 412's tail rotor during a preflight.
I remember eons ago, during my initial helicopter training reading something about the fact
that this procedure puts too much stress on the TR links and shaft, therefore it is a better idea to rotate the Main Rotor instead, to inspect both TR blades.
Is there any specific written documentation or reference for helicopters in general and a Bell 412 in particular?
Many thanks!