Originally Posted by
Ascend Charlie
...have a way of isolating the hyd pressure inside the system like the Bell machines do..
I'm not sure I understand that. Isolating hydraulic pressure inside the system might result in pressure lock on both sides of the servo power piston, causing it to jam, no? Or do you mean, if the fluid level in the system gets low, isolate the tail rotor servo and preserve any remaining hydraulic pressure for the cyclic servos?