I've had the pleasure (??) of doing many N1 topping checks on B412s over the years. One of the cherished perquisites of a night pilot is the privilege of doing maintenance test flights at 3 or 4AM after the mechs have finished doing inspections. For an N1 topping check, the mechanic fiddles with a thingy in the back, and then you go up in the dark and pull the collective up into your armpit and while staying right-side up and out of clouds, note when the rotor RPM droops. It's supposed to droop at 100% torque, plus or minus, and you are allowed to pull more than 100% briefly to check it. Then the mechanic resets the thingy, and that sets where the N1 topping occurs, and assures you that you can pull at least 100% torque before that happens. This is more fun than any old fart like me deserves, especially when the weather is less than clear black and 22, and the #(*&$^(# thing won't droop and you have to make several flights to get it in limits. We don't get to do that in the S76.
