OK, I did what you said. I read your App. Note 1. Also googled around for
other things you have written. I guess I still don't "get it."

Your App. Note 1 references an AC that was superseded back in 1996, AC
20-62C, which is now AC 20-62D. The current version says in the definition
of "Acceptable Parts": "(2) Parts produced by an owner or operator for
maintaining or altering their own product and which are shown to conform to
FAA-approved data." So how can an owner's home-made dimmer circuit can be
installed without any approved data?

You have cited the "Chief Counsel" on several occasions. Do you mean, by
any chance, the "Assistant Chief Counsel for Regulation letter dated Aug. 5,
1993 " referred to in http://www.awp.faa.gov/new/fsdo/ans_jan2_98.htm? I
would like to see that letter, if you know anywhere that it is published.
Unless it is publicly available, it would be hard for someone to cite it as
an authority.



"Jim Weir" wrote in message
...

I've been answering this same exact question for thirty-three years
exactly the
same way, and I'm not going to go into the song and dance here again. You
can
google the answer if you like, or you can download Applications Note 1
(the one
I wrote back in 1972 as amended through last year) from
www.rstengineering.com
if you want the long answer.

Or, I can reproduce it here if you all would like some flame bait.

Jim


"Dan Thompson"
shared these priceless pearls of wisdom:

-Wouldn't replacing an approved dimmer assembly with a home-made one be a
-"major alteration" that would require a Form 337, and field approval of
the
-data, for return to service?



Jim Weir (A&P/IA, CFI, & other good alphabet soup)
VP Eng RST Pres. Cyberchapter EAA Tech. Counselor
http://www.rst-engr.com