On Wednesday, December 13, 2017 at 3:47:13 PM UTC-8, 2G wrote:
On Tuesday, December 12, 2017 at 8:42:37 PM UTC-8, Darryl Ramm wrote:
On Tuesday, December 12, 2017 at 8:16:41 PM UTC-8, 2G wrote:
On Tuesday, December 12, 2017 at 2:16:03 PM UTC-8, Darryl Ramm wrote:
...and more than that, I have the Mode C veil stuff wrong as well, thanks for David Anisman for reminding me of past FAA interpretation letters, clearly I made a mistake trying offer a quick hit at airspace stuff while talking about ADS-B. I've updated that post again :-(

I'll write up a separate post trying to get all the airspace stuff properly explained. It deserves some careful writing all in in one place. And I may get a letter off to the FAA to reconfirm again for ADS-B. But the big thing is previous FAA legal interpretation support you can be above any airspace (including within a Mode C veil) at 10,000' in a glider without a transponder and that interpretation should carry over to ADS-B Out after 2020. You can't be below 10,000' and above Class C airspace, that is one that catches some into needing full 2020 ADS-B Out requirements, another is obviously the big dogs who want to fly in Class A airspace after 2020.

No of course I'd hope pilots flying anywhere in or near a Mode C veil would voluntarily equip with transponders and increasingly with ADS-B out. The nice thing is TABS allows you to do that voluntarily at lower cost that full 2020 ADS-B compliance, including using a Trig TT21 transponder (without upgrading it to a TT22) and a TN72 $350 GPS.

My headache is back.

So, now I can have an ADS-B compliant system using my TT21? When did that change?

Tom

I can't follow what you are replying to, a comment about voluntarily equipping with TABS... TABS is *not* a 2020 Complaint ADS-B Out solution.

Did you read the post I linked to at the top of this thread? I explain the options, not one of those mentioned involves a TT21 that gives you a 2020 Complaint ADS-B out solution.

I was replying to your last comment:

"No of course I'd hope pilots flying anywhere in or near a Mode C veil would voluntarily equip with transponders and increasingly with ADS-B out. The nice thing is TABS allows you to do that voluntarily at lower cost that full 2020 ADS-B compliance, including using a Trig TT21 transponder (without upgrading it to a TT22) and a TN72 $350 GPS."

You have previously posted that they TT21 would not satisfy the ADS-B out mandate.

Yes, I read all of your posts.

Tom

Tom

The TT21 will not meet the ADS-B out mandate requirements.

The TT21 *can* be used to do ADS-B Out TABS.

They are not conflicting statements.

How we arrived here is painful, at one time I thought it was likely the transponder and ADS-B Out exemptions would be removed. And hoping that _if_ that was going to happen that there would be regulations to allow use of TABS devices for gliders and others to use as a alternate means of complying, or partially complying with ADS-B Out regulations. With the exemption remaining in place TABS regulations really don't become important (OK I'd like if glider could use say use TABS to comply with some remaining ADS-B Out restrictions, say to fly above Class C airspace up to 10,000'). So TABS, besides the TABS device TSO definitions is really all unregulated stuff, you just voluntarily install it, but doing so does not grant you any 2020 ADS-B Out (akk 14 CFR 91.226) compliant privileges.

Drop me a private email if you want to discuss something deeper or specific..

Popping up to a general comment:

With the TN72 GPS we should be covered for folk that worry about TSO or not install issues in certified gliders. The TN72 *is* TSO'ed, but to TSO-C199 (TABS) not say TSO-C145c (for 2020 Compliant ADS-B Out... even if it does meets the performance level of TSO-C145c and can be used to do that in experimental aircraft). For 2020 Complaint ADS-B Out the need for an actual TSO GPS source in any certified aircraft seems well established, regardless of other arguments about that... but I have some faint hope that folks there might establish STCs that get around that (not for gliders but in general for GA).

Jumping ahead to preventing possible issues: one thing people might run into is confusion when discussion with A&P IA folks or FSDO staff... who may assume that any discussion about ADS-B is to meet 14 CFR 91.225 and on the FAA folks will naturally want to follow standard policy there, specifically https://www.faa.gov/regulations_poli...mentID/1029526 My interpretation is simply that does *not* apply to TABS installs, since the install is not being done to comply with 14 CFR 91.226 and 92.227. As always discuss stuff with you A&P IA and let them worry about any questions to FSDO staff if needed.

Now the TN72 is here, $350 + antenna + install costs to add in TABS ADS-B Out to any glider with a TT21 or TT22 already installed seems a great deal, and something folks want to think about over this winter... which was what started my post linked to up top.