Darryl,

Thanks for taking the time and trouble to write your last post - I found it extremely informative!

Out of curiosity I did a Google search for "DO-260A versus DO-260B" to see what was changed. I found something ( http://adsb.tc.faa.gov/WG3_Meetings/...es_1-09-09.doc ), but it was way to technical for me.

Is there anything in this DO-260A to B change that we glider pilots should understand, or is it mostly "inside baseball" stuff that's important (as you said) only if you implement ADS-B?

-John

On Monday, November 19, 2012 3:42:29 AM UTC-5, Darryl Ramm wrote:
As I think I mentioned before, Trig TT21/22 transponders were previously DO-260A complaint and in the recent firmware version 2.1 (or higher) have been updated to DO-260B compliance and Trig has been granted the corresponding TSO-C166b approval for these transponders. Older Trig transponders can be upgraded to DO-260B compliance by returning to Southeast Aerospace (SEA) for a free firmware update, you just pay shipping. Contact Laurie Burgess at SEA ) to arrange an RMA. I don't believe the is any reason to do this update unless you want to do ADS-B data-out.