perhaps the SSA can learn from the EAA about how to get an STC for experimental equipment to satisfy the ADS-B requirement

http://www.eaa.org/en/eaa/eaa-news-a...04-06-2016-stc

"EAA, FAA, and Dynon officials said they have established a supplemental type certificate (STC) process for installation of the Dynon EFIS-D10A as a replacement for the airplane's primary attitude indicator. This allows innovations developed for the amateur-built aircraft fleet to make their way into specific Cessna and Piper models."

--bob