Odd question. We bought our plane 3 years ago and was told it was ADSB compliant. We've flown into Class C airspace without controllers ever having an issue (as recently as within the past month).
The plane is currently in annual and we asked a question to look into a transponder setting (Garmin GTX327). They are saying they don't see any ADSB device present. They have the log books so I can't look in detail. I have the electronic logs from 2016-current and don't see any entry that one was installed in that time.
An ADSB device would have to be in the logs if installed correct?
ATC would have said something and not allowed us into Class C airspace without ADSB correct?
First, the Garmin GTX327 is not an ADS-B-out device, and (unlike the pre-ADS-B-out Garmin GTX330), cannot be upgraded to be one. Second, any ADS-B-out installation would have to be recorded in the maintenance records. I believe it would also require the addition of a supplement to the airplane's AFM and a 337. Finally, while the regs do require ADS-B-out in Class C airspace, I suppose it's possible that a controller would not notice the lack of ADS-B-out.
There are a few remote-installed ADS-B-out devices which don't appear on the panel, such as the Garmin GDL-82/84/88. You might ask your mechanic to look for one.
Thanks for the reply. Yes, I think you're right that there is a GDL 82 that didn't get the right paperwork when installed. The plane went through Class C airspace probably a dozen times since we got it so I just making sure there were no odd reasons ATC wouldn't say anything.