FAA AC 23.1521-2
FAA AC 23.1521-2 Type Certification Of Oxygenates And Oxygenated Gasoline Fuels In Part 23 Airplanes With Reciprocating Engines Gives information and guidance concerning an acceptable means, but not the only means, of compliance with part 23 of the Federal Aviation Regulations (FAR), applicable to approval procedures for certi