On Tuesday, January 3, 2017 at 7:11:53 PM UTC-5, Sarah wrote:
Hi Walt,

On Tuesday, January 3, 2017 at 5:31:05 PM UTC-6, WaltWX wrote:

It sounds like having TABS with your Trig in a glider will make you more visible to other aircraft who can track ADS-B out messages. The Mode S transponder already gives an equipped glider visibility to TCAS.

Right. It would make you visible on all those GA ADSB-in devices & ipads. That's something. It should also make your position visible to powerflarm users, but I have not verified that.

Now, in a Mode S equipped glider, I can request a clearance to enter Class A,B, C, or restricted airspace ... but in the future after 2020... will that clearance be denied UNLESS I have a TSO-C166B ADS-B out device?

That's how I read 91.225. I'd love to be corrected. If you really need to enter class A IFR, you'll need something much more expensive and harder to fit in a glider, a 1090es/TSO-C166 device. A TSO'd UAT is enough for class B or C. If you have an experimental glider non-TSO'd equipment is OK but you have to be careful.
https://www.faa.gov/nextgen/equipadsb/faq/#q4
I'm not an expert in these areas - see other posts on RAS or page Darryl Ramm.

I would hope that FAA or ATC would allow clearances to enter/transit Class A,B,C and restricted airspace WITH a TABS device.

One can always hope.


So, to me... this sounds like a very minimally beneficial upgrade to my Trig setup. I wonder... will TABS devices be visible to the satellite based ADS-B tracking service? If so, it might replace other satellite tracking devices like Spot and Delorme/Garmin InReach.

I don't know. I suspect they would be as visible as any other ADSB-out device, but I'm not certain.

The big advantage of having a TN72 coupled with a Trig transponder is that it will trigger the ADS-B ground stations to generate TIS-B and ADS-R broadcasts so that you can reliably see other aircraft if you are ADS-B IN equipped. Without an ADS-B OUT signal, you will not see any transponder equipped aircraft unless they are ADS-B OUT equipped, nor will you see ADS-B OUT equipped aircraft that are using a different frequency than your ADS-B receiver (not an issue if you have a dual frequency ADS-B receiver).