Some experimental aircraft operating limitations require that before acting as Pilot-in-Command, a pilot must get an aircraft authorization on his or her pilot certificate. The process is similar to seeking a type rating in a standard category aircraft.
US code Title 14 CFR section 21.191
Take ground and flight training from an Authorized Instructor or Certified Flight Instructor for this type of aircraft, pass a practical test with an Experimental Aircraft Examiner different than the Instructor to get an Experimental Aircraft Authorization on your pilot certificate.
Federal Aviation Administration
Vintage & Experimental Program Office
6425 South Denning Avenue
Oklahoma City, OK 73169-6937
405-594-6400
Airline Pilots, Copilots, and Flight Engineers