Originally Posted by
Fuseplug
Both fan and core have blocker doors on the 17. If an ERO is performed, they would be in reverse for a ramp onload. Some guys (myself included) will shut down with the T/Rs deployed in windy conditions (or if windy conditions are expected while parked overnight) to reduce the fan windmilling that can occur with a strong tailwind. As far as I know, it's not a -1 procedure, but it's what I learned from some smart dudes/dudettes.
Have to admit that I always wondered why it's OK for the N1 spool to spin freely (maybe backwards) for hours on end when parked in a stiff breeze without any oil flow.