I have found that we are missing an STC for fitment of a prop and an uprated engine. It is signed up in the Aircraft log as carried out IAW SA03141AT,
Here is a copy
We are also missing the 337 for this mod.
So what’s the next step? I have the Engine and prop logs with a sign off on the STC in 1996. Can I just send the 337 off to the FAA? I am being told that I am going to have to buy the STC from the owner, I this correct?
Thanks