Jose wrote:
ok, here's my question: Are you saying that I could install any part
(certified or uncertified) I want in my cherokee as long as I have an
approval basis
for the installation? or are you saying that no approval basis of the
installation is required?

I actually talked with somebody at my FSDO (CT) about this kind of
thing. We were talking about installing a non-certified backup AH.

1: You can't install a non-certified (NC) part as a required part of a
certified plane. Thus, the NC gyro can't be your only gyro, or be one
in the sacred six position.

Where is this sacred six panel arrangement described as a must-have?

Where does it say that I can't have any other arrangement but the
traditional six pack?

I'm not arguing whether or not the six pack is the most optimal from a
human factors standpoint. I'm trying to find an FAA citation for that
assertion.

-jav