Quote Originally Posted by Bill Berson View Post
Then it can switch back and forth as desired if it meets both rules. The instructions are in AC 103-7.
I got a chance to skim over the doc and did not see where it said that. In fact, it specifically says:

15. AIRWORTHINESS CERTIFICATE (103.1(c).

a. If your ultralight has been issued an airworthiness certificate. YOU
cannot operate it as an ultralight vehicle under Part 103, An ultralight cannot
be operated interchangeably as a certificated aircraft and an ultralight
vehicle.


It does say it can be an E-A/B if it meets the major portion rule; if not it can be experimental-exhibition. To return it to a Part 103 ultralight requires surrender of any A/W certificate.