My IA and I are knee deep in the paperwork now for the Skywagon project in preparation for its first flight and thought this might be of interest...
The thoughts on the "legality" of using Air Gizmos (and other mounts) are all over the place. Some want just a log entry, while others insist on getting field approvals.
Here is an interesting Policy Statement that has now cleared it up. There are some guidelines, but it seems that you can now install any mount with just a log book entry, even if there is no STC or the mount is not PMA'd. (please read and use your own judgement)
Greg-
http://www.backcountrypilot.org/images/documents/PS-ACE-23-01.pdf

