Whirly: If you don't know the difference between a TR drive failure and TR control failure, I suggest you go back to school before your next flight
I would suggest 90% of the helicopter fraternity do not practice nor discuss TR problems in sufficient depth. For many it's put in the "too difficult" box.
It would be interesting to learn whether there is an increased incidence of TR failures/control failures than engine failures.
I know which I would prefer
