Checking auto NR, I'd do it like this-. .Compute the whole mess: temp, weight, altitude, target NR;. .Climb to altitude;. .Establish auto airspeed;. .Reduce collective to bottom or NR top of green;. .One engine back, then the other to split the needles and assure accurate auto NR;. .Promptly resume powered flight! INTENTIONAL AUTOROTATIONAL LANDINGS NOT PERMITTED in any twin I've ever flown.. .Your first real auto would be pure pass/fail determined by acceptance of the grade...