[Code of Federal Regulations] [Title 14, Volume 1] [Revised as of January 1, 2003] From the U.S. Government Printing Office via GPO Access [CITE: 14CFR39.3] [Page 849] TITLE 14--AERONAUTICS AND SPACE CHAPTER I--FEDERAL AVIATION ADMINISTRATION, DEPARTMENT OF TRANSPORTATION PART 39--AIRWORTHINESS DIRECTIVES--Table of Contents Sec. 39.3 Definition of airworthiness directives. FAA's airworthiness directives are legally enforceable rules that apply to the following products: aircraft, aircraft engines, propellers, and appliances.