Originally Posted by
FlightDetent
I always wondered, but never checked, what are the N1 cockpit readings with significant counter-rotation? Now and then you see engines spinning backwards with what seems to be 3% ... (not t7 specific)
On the 73 we'll frequently see N1 around the 1.5-2% mark with a decent wind on start, which is in the vicinity of 70-100 RPM on the fan.