"Jim Macklin" wrote in message
news:bO1vf.40586$QW2.11660@dukeread08...

Yes, the drawing are approved data and you can "repair them
and have those repaired parts approved. Yes, you do have to
jump through the hoops, but it can be done.

The feds will look at your materials list, fabrication
methods and such parts that you substitute, such as an
alternator for a generator, to assure that they are
airworthy. Most FAA types do the job because they love
airplane, stroke their egos just a little and they will help
you get your airplane in the air. But they are bureaucrats,
show some respect for the procedure, get their help and
approval first.

The wind generator does not have to be original factory
installed in 1941 on that model airplane. It could be from
any similar airplane anytime from 1941 to the present time.
Your job is to show a proper method for attachment of a wind
driven something on the airplane. So if you find a spray
rig for a Champ, Cub or Chief, you can infer that the
installation of a generator/alternator in the same manner in
the same location would have the same aerodynamic effect
[none/insignificant] and similarly show each part you will
install has met the FAA standards on other aircraft of
similar types.


You're not repairing anything, you're fabricating a new appliance.