How do I legallly install winglets on a standard airworthiness certificate?

On Nov 21, 5:49*am, lanebush wrote:
Scott,

The 337 form can be sent in before the work begins. *This allows for
approval/disapproval before a saw is taken to the airplane. *I imagine
you will have to hire a DER (designated engineering representative) to
do an engineering analysis to accompany the 337. *Harold Kasola is
very easy to work with and has Kasola Engineering in Albany, GA. *A
call to him would be worth the effort. *Having just certified a club
glider in experimental (last week), I can tell you it took a few days
and a trip to the FSDO.

No inspector is going to sign a 337 before the work is done and DAR/
DER's aren't cheap. I paid $750.00 for an airworthiness-for-export and
the guy wasn't here more than 30 minutes.
JJ