The airworthiness standards for the issue of type certificates for small airplanes with nine or less passenger seats in the normal, utility, and acrobatic categories may be found in the

Federal Aviation Administration FAA
These changes are meant to restrict the use of Part 23 of the Federal Aviation Regulations to small aircraft with a passenger seating layout of nine seats or less, excluding pilot seats.
Federal Aviation Administration - Issues and enforce regulations and minimum standards covering manufacturing, operating, and maintaining aircraft. We certify airmen and airports that serve air carriers. The safe and efficient use of navigable airspace is one of our primary objectives
Civil aviation regulation to increase safety
promoting and advancing civil aviation, including new technologies creating and running a navigation and air traffic control system for both civilian and military aircraft
Civil aviation and the National Airspace System research and development
creating and implementing plans to reduce aircraft noise and other impacts of civil aviation on the environment
Controlling commercial space travel in the United States
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