Toe ...

The misunderstanding in this whole thread is that the FAA gives wide
latitude to the MECHANIC to determine what is required and what is not. A
rookie wrench on his first engine installation would probably want to fly
the airplane a couple of hours just to be sure that (s)he did it right.
After your tenth or twentieth motor swap, give the owner the keys and kick
him out the door.

That isn't just unwritten legend. I have a document here in front of me
published by Western Region ("Plane Sense") that prints the words, "It is
the MECHANIC'S opinion as to what constitutes a major or minor repair or
modification". That pretty much cuts it for me.

Jim



Also, as I've indicated previously, if the service facility considers
a .407 flight necessary, it must write it into the maintenance record
sign-off as such, and the bird is not approved for return to service
until after that flight is performed and duly noted.

TC