Rick6a
Well Known Member
I just hung the brand new Hartzell BA. I couldn't help but notice that on either side of each prop hub, there are a pair of screw holes. Only one pair of holes on one prop hub has screws and safety wire attached. The other 3 pair of holes are devoid of anything. Question: What is the purpose of these holes and why would only one pair of holes be secured with screws and safety wire?