Was wondering if I could pick the collective brain.
Recently flew a A109E that if you let it sit for more that two hours, start it up and pick it up in to the hover, it will have a one per airframe bounce - not through the controls. It happens with or without the SAS or inverters on. lower the collective to flat pitch and it goes away for the rest of the flight. If you start up with a short period of time it does not reappear, let it sit for a couple of hours and its back again.
The engineers said that they changed the dampeners, inspected the rotor head (elastomeric bearings, droop stops, etc), tested the inverters, checked for grounding issues but with out any luck.
Any thoughts?
Last edited by gwelo shamwari; 4th Jul 2013 at 16:31.