Collective Binding
Ian - thanks for that post. I have printed it out for our mechanic. We are having a collective "binding" where the collective feels like it springs back when you pull it up to a high setting. Usually around 97% Ng. Anything above that, the collective wants to come down and settle around 96.5%. Have you heard of that before? Our mechanic has tore it down a few times and spoke with EC reps and various other techs in our company with no good solution.
It looks like, from your list of possible problems, that that the issue may be related to #2 or #8? .
It does seem like airspeed has an effect on the "force" of the collective wanting to spring back down at higher settings. Thank you.
2. Anticipator spring
--->Check the spring is not extending with the collective up. The pilot sometimes states he has reached the upper stop when he feels the spring extend. This becomes a Governor rigging problem or a binding Gov. cable problem.
8. Mixing-unit torque tube end cap bearings
--->Inject grease (normally shows in forward flight as the rotor loads build-up and goes away at a lower airspeed).