CFR /  Title 14  /  Part 11  /  Sec. 11.21 What are the most common kinds of rulemaking actions

FAA follows the Administrative Procedure Act (APA) procedures for these common types of rules:

(a) Rules found in the Code of Federal Regulations;

(b) Airworthiness directives issued under part 39 of this chapter; and

(c) Airspace Designations issued under various parts of this chapter.