What work do I need signed off?

[Hockeystud87]

I just installed a oil cooler on my model 4. I'm not the origin builder.



Do I need to get this signed off? Or since I'm experimental I can just fly it?

[aviator79]

It needs to be signed off, but by you. You are authorized to do the work, but you still need to keep accurate logs and update your weight and balance.