Finally, I got a copy of the FAA Airworthiness Concern Sheet and talked to a person at Garmin about what was really going on and here's what I found.
As you can imagine, this got my attention and I started to investigate the issue.
From the Avionics West site: The FAA Airworthiness Concern Sheet Early this week I head a rumor from an AVweb editor friend of mine that there was a 'Airworthiness Concern Sheet' circulating around that stated there may be an AD issued against the Garmin GNS 430.
