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Just to clarify, absolutely anyone can work on an experimental--it doesn't need to be an owner/operator or a pilot or an A&P or an IA--absolutely anyone could do anything to it.


Same thing can be said about certified aircraft. Now, whether or not it affects the airworthiness of the aircraft is another matter. As for the person who worked on it, the FAA can't do much to him. If he doesn't have a pilot/mechanic license in the first place, the FAA has nothing to revoke. The FAA has no authority to put people in jail either.

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