It's often said that the cockpit is a terrible learning environment...and it's very, very true.
Can't agree.
The best FD learning environment is....'do it right the next time, dammit, or you're out on your ear.'
Works every time...
....when the trainee lost it and the check crew didn't grab the situation in time.
Or, when an FAA inspector reached up and switched OFF the rudder boost during an engine out go-around in a 707.
Nasty business, that.
All recorded on the CVR, the airline later was presented with a brand new airplane, courtesy of the FAA.
And, FAA inspectors were
told, keep hands to self.