Hi Flint,
Thanks for your quick response. I know what you're saying: there may be just a hint of feedback when flown sporty perhaps but with this aircraft it's very pronounced even with minor control inputs; it's certainly much more noticable than the other S76 we have here. And although it's a C++ this old bird is neither new nor tight
My initial suspicion was the same as yours, some kind of cable or bellcrank hangup. I asked the engineers to check the continuity of the T/R controls aft of the mixing unit and we all had a good look at the pulleys etc. but could not find any binding.
I did find out that the T/R control cables were recently changed. Perhaps that's the cause of it all but that raises the question; is this just a matter of letting the cables wear in or does the rigging still need to be adjusted?