Not really sure, but in § 91.225 it states:
"The requirements of paragraph (b) of this section do not apply to any aircraft that was not originally certificated with an electrical system, or that has not subsequently been certified with such a system installed, including balloons and gliders"
I assume the use of "certificated" and "certified" here is used to mean airworthiness certificate, not type certificate. In the latter case section 91.225 might not apply to EAB.
Obviously (maybe not so obvious) is that 91.225 does not, per 91.1, apply outside Part 91. Ultralights would not need to be equipped with ADS-B out.
FAA ADS-B Advisory Circular has more info but doesn't seem to specifically answer the original question:
http://www.faa.gov/documentLibrary/media/Advisory_Circular/AC 20-165A.pdf
"The requirements of paragraph (b) of this section do not apply to any aircraft that was not originally certificated with an electrical system, or that has not subsequently been certified with such a system installed, including balloons and gliders"
I assume the use of "certificated" and "certified" here is used to mean airworthiness certificate, not type certificate. In the latter case section 91.225 might not apply to EAB.
Obviously (maybe not so obvious) is that 91.225 does not, per 91.1, apply outside Part 91. Ultralights would not need to be equipped with ADS-B out.
FAA ADS-B Advisory Circular has more info but doesn't seem to specifically answer the original question:
http://www.faa.gov/documentLibrary/media/Advisory_Circular/AC 20-165A.pdf