A question for EC120 gurus:
I had a problem with collective friction on one particular helicopter. All the time I flew with the same friction setting. For the first hour or so, the friction was uniform through the whole operatinional travel of the collective. After time the friction was getting hard to about 7, 7.5 FLI TQ, after 8 FLI it sort of released and the friction was like before 7 FLI. The manitenance team took apart the whole collective assembly and checked the whole control system, no problems found, everything in limits.
Than on one flight, I experienced the same problem, the friction got harder from 7-8 FLI TQ and I released the friction completely moved the collective up and down a few times, set the friction to practical full on, did the movement again, set it back to my normal preference, and the problem was gone for about an hour flight time.
Any idea what the problem would be? We are running out of ideas. Did something like that ever happen to you?