[Code of Federal Regulations] [Title 14, Volume 1] [Revised as of January 1, 2006] From the U.S. Government Printing Office via GPO Access [CITE: 14CFR23.171] [Page 197] TITLE 14--AERONAUTICS AND SPACE CHAPTER I--FEDERAL AVIATION ADMINISTRATION, DEPARTMENT OF TRANSPORTATION PART 23_AIRWORTHINESS STANDARDS: NORMAL, UTILITY, ACROBATIC, AND COMMUTER CATEGORY AIRPLANES--Table of Contents Subpart B_Flight Sec. 23.171 General. The airplane must be longitudinally, directionally, and laterally stable under Sec. Sec. 23.173 through 23.181. In addition, the airplane must show suitable stability and control ``feel'' (static stability) in any condition normally encountered in service, if flight tests show it is necessary for safe operation.