If the student is going right to left seat on the same plane or has previously been qualified on the plane you can go 3 man. New hire or new to the plane is 4 man. Ultimately it’s at the discretion of the LCA but pretty much all release the extra FO if they’re not needed.Totally off topic... you guys are able to run OE on augmented flights as a three pilot crew? We are required to run 4 pilots because the OE pilot isn't checked out yet and as such can't be at the controls without a check pilot in the other seat. That even applies in the case where the pilot is still technically right seat (and hence RO) qualifed.