The attached comes from the Flight Safety S-76 training manual. No differentiation is made between the different models, (A, B, C, or different + versions) so presumably all drive trains are the same.
This graphic is a little clearer than the one provided by Gordy, but you can see the gear indicated (red) does not drive the tail rotor. Tail rotor drive is only provided via the gear indicated in green.
The schematic attached also backs up flintexpert input that the tail rotor drive is via straight cut gears, rather than the helical to the MGB.
It is a possible failure mode that I feel should be emphasised a little more in training than it seems to receive. It is one I used to point out to people I flew with.
Agree the diagrams provided by training organisations cause confusion on this point, and could be improved by an overhead view.
Last edited by megan; 29th May 2017 at 02:21.