[Code of Federal Regulations] [Title 14, Volume 1] [Revised as of January 1, 2007] From the U.S. Government Printing Office via GPO Access [CITE: 14CFR33.23] [Page 774] 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. 33.23 Engine mounting attachments and structure. (a) The maximum allowable limit and ultimate loads for engine mounting attachments and related engine structure must be specified. (b) The engine mounting attachments and related engine structure must be able to withstand-- (1) The specified limit loads without permanent deformation; and (2) The specified ultimate loads without failure, but may exhibit permanent deformation. [Amdt. 33-10, 49 FR 6851, Feb. 23, 1984]