carried out under provisions provided by the FAA.
Unfortunately, such provisions do not apply in Europe. CAT.GEN.MPA130, NCC.GEN.125 and NCO.GEN.120 all say the same thing:
"A helicopter rotor shall only be turned under power for the purpose of flight with a qualified pilot at the controls"
I've done it plenty of times in the past but will think more than twice about doing it in the future. We can argue the semantics but it will be a difficult time at the inquest if it all goes t1ts up while you're outside the aircraft.