[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: 14CFR33.21] [Page 738] TITLE 14--AERONAUTICS AND SPACE CHAPTER I--FEDERAL AVIATION ADMINISTRATION, DEPARTMENT OF TRANSPORTATION PART 33--AIRWORTHINESS STANDARDS: AIRCRAFT ENGINES--Table of Contents Subpart B--Design and Construction; General Sec. 33.21 Engine cooling. Engine design and construction must provide the necessary cooling under conditions in which the airplane is expected to operate.